U.S. patent application number 11/390847 was filed with the patent office on 2006-12-21 for opththalmic devices comprising polyester compositions formed from 2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1,4-cyclohexanedimethanol.
Invention is credited to Gary Wayne Connell, Emmett Dudley Crawford, David Scott Porter.
Application Number | 20060287484 11/390847 |
Document ID | / |
Family ID | 36630440 |
Filed Date | 2006-12-21 |
United States Patent
Application |
20060287484 |
Kind Code |
A1 |
Crawford; Emmett Dudley ; et
al. |
December 21, 2006 |
Opththalmic devices comprising polyester compositions formed from
2,2,4,4-tetramethyl-1,3-cyclobutanediol and
1,4-cyclohexanedimethanol
Abstract
Described are ophthalmic products comprising polyester
compositions comprising polyesters which comprise (a) a
dicarboxylicacid component having terephthalic acid residues;
optionally, aromatic dicarboxylic acid residues or aliphatic
dicarboxylic acid residues or ester residues thereof;
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and
1,4-cyclohexanedimethanol residues.
Inventors: |
Crawford; Emmett Dudley;
(Kingsport, TN) ; Porter; David Scott;
(Blountville, TN) ; Connell; Gary Wayne; (Church
Hill, TN) |
Correspondence
Address: |
B. J. Boshears;Eastman Chemical Company
P.O. Box 511
Kingsport
TN
37662-5075
US
|
Family ID: |
36630440 |
Appl. No.: |
11/390847 |
Filed: |
March 28, 2006 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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60691567 |
Jun 17, 2005 |
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60731454 |
Oct 28, 2005 |
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60731389 |
Oct 28, 2005 |
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60739058 |
Nov 22, 2005 |
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60738869 |
Nov 22, 2005 |
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60750692 |
Dec 15, 2005 |
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60750693 |
Dec 15, 2005 |
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60750682 |
Dec 15, 2005 |
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60750547 |
Dec 15, 2005 |
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Current U.S.
Class: |
528/302 |
Current CPC
Class: |
C08K 3/32 20130101; C08K
2201/014 20130101; A47F 5/00 20130101; E01F 8/0005 20130101; E04D
13/03 20130101; C08L 101/00 20130101; C08J 5/18 20130101; Y10T
428/1397 20150115; Y10T 428/24107 20150115; B65D 25/00 20130101;
Y10T 428/162 20150115; B01D 61/30 20130101; B29L 2031/7542
20130101; Y10T 428/24479 20150115; C08J 7/0427 20200101; B29C 49/00
20130101; C08J 2483/00 20130101; C08K 5/521 20130101; Y02A 40/25
20180101; Y10T 428/31504 20150401; B29B 2911/14986 20130101; G02B
5/3083 20130101; B32B 17/10018 20130101; C08L 69/00 20130101; B32B
27/36 20130101; G02F 1/133606 20130101; B29K 2067/00 20130101; B65D
23/10 20130101; C08J 7/123 20130101; G02B 1/14 20150115; C08G
63/199 20130101; Y10T 428/24942 20150115; Y10T 428/31786 20150401;
B65D 43/00 20130101; B65D 1/0207 20130101; G02B 1/105 20130101;
C08L 67/02 20130101; Y10T 428/161 20150115; C08J 2367/02 20130101;
Y10T 428/31507 20150401; A61M 1/16 20130101; C08J 2367/00 20130101;
Y10T 428/139 20150115; C08G 63/183 20130101; Y10T 428/1352
20150115; A01G 9/1438 20130101; Y10T 428/31663 20150401; C09D
167/02 20130101; G02B 1/10 20130101; C08L 67/02 20130101; C08L
2666/02 20130101; C08L 67/02 20130101; C08L 2666/18 20130101; C08L
69/00 20130101; C08L 2666/18 20130101; C08K 3/32 20130101; C08L
67/00 20130101; C08K 5/521 20130101; C08L 67/02 20130101 |
Class at
Publication: |
528/302 |
International
Class: |
C08G 63/16 20060101
C08G063/16 |
Claims
1. An ophthalmic product comprising at least one polyester
composition comprising at least one polyester, which comprises: (a)
a dicarboxylic acid component comprising: i) 70 to 100 mole % of
terephthalic acid residues; ii) 0 to 30 mole % of aromatic
dicarboxylic acid residues having up to 20 carbon atoms; and iii) 0
to 10 mole % of aliphatic dicarboxylic acid residues having up to
16 carbon atoms; and (b) a glycol component comprising: i) 10 to 99
mole % of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and ii)
1 to 90 mole % of 1,4-cyclohexanedimethanol residues, wherein the
total mole % of the dicarboxylic acid component is 100 mole %, the
total mole % of the glycol component is 100 mole %; and wherein the
inherent viscosity of the polyester is from 0.1 to 1.2 dL/g as
determined in 60/40 (wt/wt) phenol/tetrachloroethane at a
concentration of 0.5 g/100 ml at 25.degree. C.; and wherein the
polyester has a Tg of from 100 to 200.degree. C.
2. The ophthalmic product of claim 1, wherein the inherent
viscosity of the polyester is from 0.35 to 1.2 dL/g.
3. The ophthalmic product of claim 1, wherein the inherent
viscosity of the polyester is from 0.35 to 1.0 dL/g.
4. The ophthalmic product of claim 1, wherein the inherent
viscosity of the polyester is from 0.35 to 0.75 dL/g.
5. The ophthalmic product of claim 1, wherein the inherent
viscosity of the polyester is from 0.40 to 0.90 dL/g.
6. The ophthalmic product of claim 1, wherein the inherent
viscosity of the polyester is from greater than 0.42 to 0.80
dL/g.
7. The ophthalmic product of claim 1, wherein the inherent
viscosity of the polyester is from 0.45 to 0.75 dL/g.
8. The ophthalmic product of claim 1, wherein the inherent
viscosity of the polyester is from 0.50 to 0.68 dL/g.
9. The ophthalmic product of claim 1, wherein the inherent
viscosity of the polyester is from 0.60 to 0.75 dL/g.
10. The ophthalmic product of claim 1, wherein the polyester has a
Tg of 100 to 180.degree. C.
11. The ophthalmic product of claim 1, wherein the polyester has a
Tg of 100 to 160.degree. C.
12. The ophthalmic product of claim 1, wherein the polyester has a
Tg of 100 to 150.degree. C.
13. The ophthalmic product of claim 1, wherein the polyester has a
Tg of 105 to 140.degree. C.
14. The ophthalmic product of claim 1, wherein the polyester has a
Tg of 100 to 120.degree. C.
15. The ophthalmic product of claim 1, wherein the polyester has a
Tg of 120 to 140.degree. C.
16. The ophthalmic product of claim 9, wherein the polyester has a
Tg of 100 to 120.degree. C.
17. The ophthalmic product of claim 9, wherein the polyester has a
Tg of 120 to 140.degree. C.
18. The ophthalmic product of claim 1, wherein the glycol component
of the polyester comprises 25 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and 30 to 75 mole
% 1,4-cyclohexanedimethanol residues.
19. The ophthalmic product of claim 1, wherein the glycol component
of the polyester comprises 15 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and 30 to 85 mole
% 1,4-cyclohexanedimethanol residues.
20. The ophthalmic product of claim 1, wherein the glycol component
of the polyester comprises 15 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and 40 to 85 mole
% 1,4-cyclohexanedimethanol residues.
21. The ophthalmic product of claim 1, wherein the glycol component
of the polyester comprises 40 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and 45 to 60 mole
% 1,4-cyclohexanedimethanol residues.
22. The ophthalmic product of claim 1, wherein the glycol component
of the polyester comprises 20 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and 60 to 80 mole
% 1,4-cyclohexanedimethanol residues.
23. The ophthalmic product of claim 17, wherein the glycol
component of the polyester comprises 40 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and 45 to 60 mole
% 1,4-cyclohexanedimethanol residues.
24. The ophthalmic product of claim 16, wherein the glycol
component of the polyester comprises 20 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and 60 to 80 mole
% 1,4-cyclohexanedimethanol residues.
25. The ophthalmic product of claim 1, wherein the dicarboxylic
acid component comprises 80 to 100 mole % of terephthalic acid
residues.
26. The ophthalmic product of claim 1, wherein the dicarboxylic
acid component comprises 90 to 100 mole % of terephthalic acid
residues.
27. The ophthalmic product of claim 1, wherein the dicarboxylic
acid component comprises 95 to 100 mole % of terephthalic acid
residues.
28. The ophthalmic product of claim 1, wherein the polyester
comprises from 0.1 to 25 mole % of 1,3-propanediol residues,
1,4-butanediol residues, or a mixture thereof.
29. The ophthalmic product of claim 1, wherein the polyester
comprises from 0.1 to 10 mole % of 1,3-propanediol residues,
1,4-butanediol residues, or a mixture thereof.
30. The ophthalmic product of claim 1, wherein the polyester
comprises from 0.01 to 15 mole % of ethylene glycol residues.
31. The ophthalmic product of claim 1, wherein the
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues is a mixture
comprising greater than 50 mole % of
cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and less than
50 mole % of trans-2,2,4,4-tetramethyl-1,3-cyclobutanediol
residues.
32. The ophthalmic product of claim 1, wherein the
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues is a mixture
comprising greater than 55 mole % of
cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and less than
45 mole % of trans-2,2,4,4-tetramethyl-1,3-cyclobutanediol
residues.
33. The ophthalmic product of claim 1, wherein the
2,2,4,4-tetramethyl-1,3-cyclobutanediol is a mixture comprising
greater than 50 mole % of
cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol and less than 50 mole %
of trans-2,2,4,4-tetramethyl-1,3-cyclobutanediol, and wherein the
dicarboxylic acid component comprises 80 to 100 mole % of
terephthalic acid residues.
34. The ophthalmic product of claim 1, wherein the polyester
composition comprises at least one polymer chosen from
poly(etherimides), polyphenylene oxides, poly(phenylene
oxide)/polystyrene blends, polystyrene resins, polyphenylene
sulfides, polyphenylene sulfide/sulfones, poly(ester-carbonates),
polycarbonates, polysulfones; polysulfone ethers,
poly(ether-ketones), polyamides, polystyrene, polystyrene
copolymers, styrene acrylonitrile copolymers, acrylonitrile
butadiene styrene copolymers, poly(methylmethacrylate), and acrylic
copolymers.
35. The ophthalmic product of claim 1, wherein the polyester
composition comprises at least one polycarbonate.
36. The ophthalmic product of claim 1, wherein the polyester
comprises residues at least one branching agent an amount of 0.01
to 10 weight % based on the total weight of the polyester.
37. The ophthalmic product of claim 1, wherein the melt viscosity
of the polyester is less than 30,000 poise as measured at 1
radian/second on a rotary melt rheometer at 290.degree. C.
38. The ophthalmic product of claim 1, wherein the polyester has a
crystallization half-time of greater than 10 minutes at 170.degree.
C.
39. The ophthalmic product of claim 1, wherein the polyester has a
crystallization half-time of greater than 50 minutes at 170.degree.
C.
40. The ophthalmic product of claim 1, wherein the polyester has a
crystallization half-time of greater than 100 minutes at
170.degree. C.
41. The ophthalmic product of claim 1, wherein the polyester has a
crystallization half-time of greater than 1,000 minutes at
170.degree. C.
42. The ophthalmic product of claim 1, wherein the polyester has a
crystallization half-time of greater than 10,000 minutes at
170.degree. C.
43. The ophthalmic product of claim 1, wherein the polyester
composition has a density of less than 1.3 g/ml at 23.degree.
C.
44. The ophthalmic product of claim 1, wherein the polyester
composition comprises at least one thermal stabilizer or a reaction
product thereof.
45. The ophthalmic product of claim 1, wherein the yellowness index
of the polyester according to ASTM D-1925 is less than 50.
46. The ophthalmic product of claim 1, wherein the polyester has a
notched Izod impact strength of at least 3 ft-lbs/in at 23.degree.
C. according to ASTM D256 with a 10-mil notch in a 1/8-inch thick
bar.
47. The ophthalmic product of claim 1, wherein the polyester has a
notched Izod impact strength of at least 10 ft-lbs/in at 23.degree.
C. according to ASTM D256 with a 10-mil notch in a 1/4-inch thick
bar.
48. The ophthalmic product of claim 1, wherein the polyester
comprises the residue of at least one catalyst comprising a tin
compound or a reaction product thereof.
49. The ophthalmic product of claim 1, wherein the ophthalmic
product is chosen from nonprescription eyeglass lenses,
prescription eyeglass lenses, and sunglass lenses.
50. The ophthalmic product of claim 1, wherein the ophthalmic
product is chosen from nonprescription eyeglass frames,
prescription eyeglass frames, and sunglass frames.
51. The ophthalmic product of claim 1, wherein the ophthalmic
product is chosen from tinted eyeglass lenses.
52. The ophthalmic product of claim 1, wherein the ophthalmic
product is chosen from hardcoated eyeglass lenses.
53. The ophthalmic product of claim 1, wherein the ophthalmic
product is chosen from eyeglass lenses comprising at least one
polarizing film or polarizing additive.
54. The ophthalmic product of claim 51, wherein the tinted eyeglass
lenses comprise at least one polarizing film or polarizing
additive.
55. The ophthalmic product of claim 52, wherein the hardcoated
eyeglass lenses comprise at least one polarizing film or polarizing
additive.
56. The ophthalmic product of claim 1, wherein the ophthalmic
product has a refractive index ranging from 1.54 to 1.56.
57. The ophthalmic product of claim 1, wherein the ophthalmic
product is formed by extrusion.
58. The ophthalmic product of claim 1, wherein the ophthalmic
product is produced by compression molding.
59. The ophthalmic product of claim 1, wherein the ophthalmic
product is produced by solution casting.
60. The ophthalmic product of claim 1, wherein the ophthalmic
product is formed by injection molding.
61. An ophthalmic product comprising at least one polyester
composition comprising at least one polyester, which comprises: (a)
a dicarboxylic acid component comprising: i) 70 to 100 mole % of
terephthalic acid residues; ii) 0 to 30 mole % of aromatic
dicarboxylic acid residues having up to 20 carbon atoms; and iii) 0
to 10 mole % of aliphatic dicarboxylic acid residues having up to
16 carbon atoms; and (b) a glycol component comprising: i) 15 to 70
mole % of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and ii)
30 to 85 mole % of 1,4-cyclohexanedimethanol residues, wherein the
total mole % of the dicarboxylic acid component is 100 mole %, the
total mole % of the glycol component is 100 mole %; and wherein the
inherent viscosity of the polyester is from 0.35 to 1.2 dL/g as
determined in 60/40 (wt/wt) phenol/tetrachloroethane at a
concentration of 0.5 g/100 ml at 25.degree. C.; and wherein the
polyester has a Tg of from 100 to 160.degree. C.
62. The ophthalmic product of claim 61, wherein the inherent
viscosity of the polyester is from 0.35 to 0.75 dL/g.
63. The ophthalmic product of claim 61, wherein the inherent
viscosity of the polyester is from 0.45 to 0.75 dL/g.
64. The ophthalmic product of claim 61, wherein the inherent
viscosity of the polyester is from 0.50 to 0.68 dL/g.
65. The ophthalmic product of claim 61, wherein the inherent
viscosity of the polyester is from 0.60 to 0.75 dL/g.
66. The ophthalmic product of claim 61, wherein the polyester has a
Tg of 100 to 120.degree. C.
67. The ophthalmic product of claim 61, wherein the polyester has a
Tg of 120 to 140.degree. C.
68. The ophthalmic product of claim 61, wherein the ophthalmic
product is chosen from nonprescription eyeglass lenses,
prescription eyeglass lenses, and sunglass lenses.
69. The ophthalmic product of claim 61, wherein the ophthalmic
product is chosen from nonprescription eyeglass frames,
prescription eyeglass frames, and sunglass frames.
70. The ophthalmic product of claim 61, wherein the ophthalmic
product has a refractive index ranging from 1.54 to 1.56.
71. The ophthalmic product of claim 61, wherein the glycol
component of the polyester comprises 40 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and 45 to 60 mole
% 1,4-cyclohexanedimethanol residues.
72. The ophthalmic product of claim 61, wherein the glycol
component of the polyester comprises 20 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues and 60 to 80 mole
% 1,4-cyclohexanedimethanol residues.
73. An ophthalmic product comprising at least one polyester
composition comprising at least one polyester, which comprises: (a)
a dicarboxylic acid component comprising: i) 70 to 100 mole % of
terephthalic acid residues; ii) 0 to 30 mole % of aromatic
dicarboxylic acid residues having up to 20 carbon atoms; and iii) 0
to 10 mole % of aliphatic dicarboxylic acid residues having up to
16 carbon atoms; and (b) a glycol component comprising: i) 20 to 40
mole % of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and ii)
60 to 80 mole % of 1,4-cyclohexanedimethanol residues, wherein the
total mole % of the dicarboxylic acid component is 100 mole %, the
total mole % of the glycol component is 100 mole %; and wherein the
inherent viscosity of the polyester is from 0.35 to 0.75 dL/g as
determined in 60/40 (wt/wt) phenol/tetrachloroethane at a
concentration of 0.5 g/100 ml at 25.degree. C.; and wherein the
polyester has a Tg of from 100 to 120.degree. C.
74. The ophthalmic product of claim 73, wherein the inherent
viscosity of the polyester is from 0.50 to 0.68 dL/g.
75. The ophthalmic product of claim 73, wherein the inherent
viscosity of the polyester is from 0.60 to 0.75 dL/g.
76. The ophthalmic product of claim 73, wherein the ophthalmic
product is chosen from nonprescription eyeglass lenses,
prescription eyeglass lenses, and sunglass lenses.
77. The ophthalmic product of claim 73, wherein the ophthalmic
product is chosen from nonprescription eyeglass frames,
prescription eyeglass frames, and sunglass frames.
78. The ophthalmic product of claim 73, wherein the ophthalmic
product has a refractive index ranging from 1.54 to 1.56.
79. An ophthalmic product comprising at least one polyester
composition comprising at least one polyester, which comprises: (a)
a dicarboxylic acid component comprising: i) 70 to 100 mole % of
terephthalic acid residues; ii) 0 to 30 mole % of aromatic
dicarboxylic acid residues having up to 20 carbon atoms; and iii) 0
to 10 mole % of aliphatic dicarboxylic acid residues having up to
16 carbon atoms; and (b) a glycol component comprising: i) 40 to 55
mole % of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and ii)
45 to 60 mole % of 1,4-cyclohexanedimethanol residues, wherein the
total mole % of the dicarboxylic acid component is 100 mole %, the
total mole % of the glycol component is 100 mole %; and wherein the
inherent viscosity of the polyester is from 0.35 to 0.75 dL/g as
determined in 60/40 (wt/wt) phenol/tetrachloroethane at a
concentration of 0.5 g/00 ml at 25.degree. C.; and wherein the
polyester has a Tg of from 120 to 140.degree. C.
80. The ophthalmic product of claim 79, wherein the inherent
viscosity of the polyester is from 0.50 to 0.68 dL/g.
81. The ophthalmic product of claim 79, wherein the inherent
viscosity of the polyester is from 0.60 to 0.75 dL/g.
82. The ophthalmic product of claim 79, wherein the ophthalmic
product is chosen from nonprescription eyeglass lenses,
prescription eyeglass lenses, and sunglass lenses.
83. The ophthalmic product of claim 79, wherein the ophthalmic
product is chosen from nonprescription eyeglass frames,
prescription eyeglass frames, and sunglass frames.
84. The ophthalmic product of claim 79, wherein the ophthalmic
product has a refractive index ranging from 1.54 to 1.56.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] This application claims priority under 35 U.S.C.
.sctn.119(e) to U.S. Provisional Application Ser. No. 60/691,567
filed on Jun. 17, 2005, U.S. Provisional Application Ser. No.
60/731,454 filed on Oct. 28, 2005, U.S. Provisional Application
Ser. No. 60/731,389, filed on Oct. 28, 2005, U.S. Provisional
Application Ser. No. 60/739,058, filed on Nov. 22, 2005, and U.S.
Provisional Application Ser. No. 60/738,869, filed on Nov. 22,
2005, U.S. Provisional Application Ser. No. 60/750,692 filed on
Dec. 15, 2005, U.S. Provisional Application Ser. No. 60/750,693,
filed on Dec. 15, 2005, U.S. Provisional Application Ser. No.
60/750,682, filed on Dec. 15, 2005, and U.S. Provisional
Application Ser. No. 60/750,547, filed on Dec. 15, 2005, all of
which are hereby incorporated by this reference in their
entireties.
FIELD OF THE INVENTION
[0002] The present invention generally relates to ophthalmic
products comprising a polyester compositions made from terephthalic
acid, or an ester thereof, or mixtures thereof,
2,2,4,4-tetramethyl-1,3-cyclobutanediol, and
1,4-cyclohexanedimethanol, having a certain combination of two or
more of high impact strengths, high glass transition temperature
(T.sub.g), toughness, certain inherent viscosities, low
ductile-to-brittle transition temperatures, good color and clarity,
low densities, chemical resistance, hydrolytic stability, and long
crystallization half-times, which allow them to be easily formed
into articles. For example, the ophthalmic products of the present
invention can have a combination of two or more of the following
properties: toughness, clarity, chemical resistance (e.g., for
withstanding lens cleaners, oils, hair products, etc.), Tg, and
hydrolytic stability.
BACKGROUND OF THE INVENTION
[0003] Ophthalmic products can be produced with a variety of
plastic materials by a variety of processes, such as injection
molding. Polycarbonates are widely used in a variety of molding and
extrusion applications.
[0004] Poly(1,4-cyclohexylenedimethylene)terephthalate (PCT), a
polyester based solely on terephthalic acid or an ester thereof and
1,4-cyclohexanedimethanol, is known in the art and is commercially
available. This polyester crystallizes rapidly upon cooling from
the melt, making it very difficult to form amorphous articles by
methods known in the art such as extrusion, injection molding, and
the like. In order to slow down the crystallization rate of PCT,
copolyesters can be prepared containing additional dicarboxylic
acids or glycols such as isophthalic acid or ethylene glycol. These
ethylene glycol- or isophthalic acid-modified PCTs are also known
in the art and are commercially available.
[0005] One common copolyester used to produce films, sheeting, and
molded articles is made from terephthalic acid,
1,4-cyclohexanedimethanol, and ethylene glycol. While these
copolyesters are useful in many end-use applications, they exhibit
deficiencies in properties such as glass transition temperature and
impact strength when sufficient modifying ethylene glycol is
included in the formulation to provide for long crystallization
half-times. For example, copolyesters made from terephthalic acid,
1,4-cyclohexanedimethanol, and ethylene glycol with sufficiently
long crystallization half-times can provide amorphous products that
exhibit what is believed to be undesirably higher
ductile-to-brittle transition temperatures and lower glass
transition temperatures than the compositions revealed herein.
[0006] The polycarbonate of 4,4'-isopropylidenediphenol (bisphenol
A polycarbonate) has been used as an alternative for polyesters
known in the art and is a well known engineering molding plastic.
Bisphenol A polycarbonate is a clear, high-performance plastic
having good physical properties such as dimensional stability, high
heat resistance, and good impact strength. Although bisphenol-A
polycarbonate has many good physical properties, its relatively
high melt viscosity leads to poor melt processability and the
polycarbonate exhibits poor chemical resistance. It is also
difficult to thermoform.
[0007] Polymers containing 2,2,4,4-tetramethyl-1,3-cyclobutanediol
have also been generally described in the art. Generally, however,
these polymers exhibit high inherent viscosities, high melt
viscosities and/or high Tgs (glass transition temperatures) such
that the equipment used in industry can be insufficient to
manufacture or post polymerization process these materials.
[0008] Thus, there is a need in the art for ophthalmic products
comprising at least one polymer having a combination of two or more
properties, chosen from at least one of the following: toughness,
high glass transition temperatures, high impact strength,
hydrolytic stability, chemical resistance, long crystallization
half-times, low ductile to brittle transition temperatures, good
color, and clarity, lower density and/or thermoformability of
polyesters while retaining processability on the standard equipment
used in the industry.
SUMMARY OF THE INVENTION
[0009] It is believed that certain ophthalmic products comprising
polyester compositions formed from terephthalic acid, an ester
thereof, or mixtures thereof, 1,4-cyclohexanedimethanol and
2,2,4,4-tetramethyl-1,3-cyclobutanediol with certain monomer
compositions, inherent viscosities and/or glass transition
temperatures are superior to polyesters known in the art and to
polycarbonate with respect to one or more of high impact strengths,
hydrolytic stability, toughness, chemical resistance, good color
and clarity, long crystallization half-times, low ductile to
brittle transition temperatures, lower specific gravity, and
thermoformability. These compositions are believed to be similar to
polycarbonate in heat resistance and are still processable on the
standard industry equipment.
[0010] In one aspect, the invention relates to an ophthalmic
product comprising at least one polyester composition comprising at
least one polyester, which comprises:
[0011] (a) a dicarboxylic acid component comprising: [0012] i) 70
to 100 mole % of terephthalic acid residues; [0013] ii) 0 to 30
mole % of aromatic dicarboxylic acid residues having up to 20
carbon atoms; and [0014] iii) 0 to 10 mole % of aliphatic
dicarboxylic acid residues having up to 16 carbon atoms; and
[0015] (b) a glycol component comprising: [0016] i) 10 to 99 mole %
of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and [0017] ii)
1 to 90 mole % of 1,4-cyclohexanedimethanol residues, wherein the
total mole % of the dicarboxylic acid component is 100 mole %, the
total mole % of the glycol component is 100 mole %; and
[0018] wherein the inherent viscosity of the polyester is from 0.1
to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane
at a concentration of 0.5 g/100 ml at 25.degree. C.; and
[0019] wherein the polyester has a Tg of from 100 to 200.degree.
C.
[0020] In one aspect, the invention relates to an ophthalmic
product comprising at least one polyester composition comprising at
least one polyester, which comprises:
[0021] (a) a dicarboxylic acid component comprising: [0022] i) 70
to 100 mole % of terephthalic acid residues; [0023] ii) 0 to 30
mole % of aromatic dicarboxylic acid residues having up to 20
carbon atoms; and [0024] iii) 0 to 10 mole % of aliphatic
dicarboxylic acid residues having up to 16 carbon atoms; and
[0025] (b) a glycol component comprising: [0026] i) 15 to 70 mole %
of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and [0027] ii)
30 to 85 mole % of 1,4-cyclohexanedimethanol residues, wherein the
total mole % of the dicarboxylic acid component is 100 mole %, the
total mole % of the glycol component is 100 mole %; and
[0028] wherein the inherent viscosity of the polyester is from 0.35
to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane
at a concentration of 0.5 g/l 00 ml at 25.degree. C.; and
[0029] wherein the polyester has a Tg of from 100 to 160.degree.
C.
[0030] In one aspect, the invention relates to an ophthalmic
product comprising at least one polyester composition comprising at
least one polyester, which comprises:
[0031] (a) a dicarboxylic acid component comprising: [0032] i) 70
to 100 mole % of terephthalic acid residues; [0033] ii) 0 to 30
mole % of aromatic dicarboxylic acid residues having up to 20
carbon atoms; and [0034] iii) 0 to 10 mole % of aliphatic
dicarboxylic acid residues having up to 16 carbon atoms; and
[0035] (b) a glycol component comprising: [0036] i) 20 to 40 mole %
of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and [0037] ii)
60 to 80 mole % of 1,4-cyclohexanedimethanol residues,
[0038] wherein the total mole % of the dicarboxylic acid component
is 100 mole %, the total mole % of the glycol component is 100 mole
%; and
[0039] wherein the inherent viscosity of the polyester is from 0.35
to 0.75 dL/g as determined in 60/40 (wt/wt)
phenol/tetrachloroethane at a concentration of 0.5 g/100 ml at
25.degree. C.; and
[0040] wherein the polyester has a Tg of from 100 to 120.degree.
C.
[0041] In one aspect, the invention relates to an ophthalmic
product comprising at least one polyester composition comprising at
least one polyester, which comprises:
[0042] (a) a dicarboxylic acid component comprising: [0043] i) 70
to 100 mole % of terephthalic acid residues; [0044] ii) 0 to 30
mole % of aromatic dicarboxylic acid residues having up to 20
carbon atoms; and [0045] iii) 0 to 10 mole % of aliphatic
dicarboxylic acid residues having up to 16 carbon atoms; and
[0046] (b) a glycol component comprising: [0047] i) 40 to 55 mole %
of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and [0048] ii)
45 to 60 mole % of 1,4-cyclohexanedimethanol residues, wherein the
total mole % of the dicarboxylic acid component is 100 mole %, the
total mole % of the glycol component is 100 mole %; and
[0049] wherein the inherent viscosity of the polyester is from 0.35
to 0.75 dL/g as determined in 60/40 (wt/wt)
phenol/tetrachloroethane at a concentration of 0.5 g/100 ml at
25.degree. C.; and
[0050] wherein the polyester has a Tg of from 120 to 140.degree.
C.
[0051] In one aspect, the invention relates to an ophthalmic
product comprising at least one polyester composition comprising at
least one polyester, which comprises:
[0052] (a) a dicarboxylic acid component comprising: [0053] i) 70
to 100 mole % of terephthalic acid residues; [0054] ii) 0 to 30
mole % of aromatic dicarboxylic acid residues having up to 20
carbon atoms; and [0055] iii) 0 to 10 mole % of aliphatic
dicarboxylic acid residues having up to 16 carbon atoms; and
[0056] (b) a glycol component comprising: [0057] i) 15 to 70 mole %
of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and [0058] ii)
30 to 85 mole % of 1,4-cyclohexanedimethanol residues, wherein the
total mole % of the dicarboxylic acid component is 100 mole %, the
total mole % of the glycol component is 100 mole %; and
[0059] wherein the inherent viscosity of the polyester is from 0.35
to 0.75 dL/g as determined in 60/40 (wt/wt)
phenol/tetrachloroethane at a concentration of 0.5 g/100 ml at
25.degree. C.; and
[0060] wherein the polyester has a Tg of from 100 to 140.degree.
C.
[0061] In one aspect, the invention relates to an ophthalmic
product comprising at least one polyester composition comprising at
least one polyester, which comprises:
[0062] (a) a dicarboxylic acid component comprising: [0063] i) 70
to 100 mole % of terephthalic acid residues; [0064] ii) 0 to 30
mole % of aromatic dicarboxylic acid residues having up to 20
carbon atoms; and [0065] iii) 0 to 10 mole % of aliphatic
dicarboxylic acid residues having up to 16 carbon atoms; and
[0066] (b) a glycol component comprising: [0067] i) 15 to 90 mole %
of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and [0068] ii)
10 to 85 mole % of 1,4-cyclohexanedimethanol residues, wherein the
total mole % of the dicarboxylic acid component is 100 mole %, the
total mole % of the glycol component is 100 mole %; and
[0069] wherein the inherent viscosity of the polyester is from 0.1
to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane
at a concentration of 0.5 g/l 00 ml at 25.degree. C.; and
[0070] wherein the polyester has a Tg of from 100 to 200.degree.
C.
[0071] In one aspect, the invention relates to an ophthalmic
product comprising at least one polyester composition comprising at
least one polyester, which comprises:
[0072] (I) at least one polyester which comprises: [0073] (a) a
dicarboxylic acid component comprising: [0074] i) 70 to 100 mole %
of terephthalic acid residues; [0075] ii) 0 to 30 mole % of
aromatic dicarboxylic acid residues having up to 20 carbon atoms;
and [0076] iii) 0 to 10 mole % of aliphatic dicarboxylic acid
residues having up to 16 carbon atoms; and [0077] (b) a glycol
component comprising: [0078] i) 10 to 99 mole % of
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and [0079] ii) 1
to 90 mole % of 1,4-cyclohexanedimethanol residues, and
[0080] (II) residues of at least one branching agent;
[0081] wherein the total mole % of the dicarboxylic acid component
is 100 mole %, the total mole % of the glycol component is 100 mole
%; and
[0082] wherein the inherent viscosity of the polyester is from 0.1
to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane
at a concentration of 0.5 g/100 ml at 25.degree. C.; and
[0083] wherein the polyester has a Tg of from 100 to 200.degree.
C.
[0084] In one aspect, the invention relates to an ophthalmic
product comprising at least one polyester composition comprising at
least one polyester, which comprises:
[0085] (I) at least one polyester which comprises: [0086] (a) a
dicarboxylic acid component comprising: [0087] i) 70 to 100 mole %
of terephthalic acid residues; [0088] ii) 0 to 30 mole % of
aromatic dicarboxylic acid residues having up to 20 carbon atoms;
and [0089] iii) 0 to 10 mole % of aliphatic dicarboxylic acid
residues having up to 16 carbon atoms; and
[0090] (b) a glycol component comprising: [0091] i) 10 to 99 mole %
of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and [0092] ii)
1 to 90 mole % of 1,4-cyclohexanedimethanol residues, and
[0093] (II) at least one thermal stabilizer or reaction products
thereof;
[0094] wherein the total mole % of the dicarboxylic acid component
is 100 mole %, the total mole % of the glycol component is 100 mole
%; and
[0095] wherein the inherent viscosity of the polyester is from 0.1
to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane
at a concentration of 0.5 g/100 ml at 25.degree. C.; and
[0096] wherein the polyester has a Tg of from 100 to 200.degree.
C.
[0097] In one aspect, the polyester composition contains at least
one polycarbonate.
[0098] In one aspect, the polyester composition contains no
polycarbonate.
[0099] In one aspect, the polyesters useful in the invention
contain less than 15 mole % ethylene glycol residues, such as, for
example, 0.01 to less than 15 mole % ethylene glycol residues.
[0100] In one aspect, the polyesters useful in the invention
contain no ethylene glycol residues.
[0101] In one aspect the polyester compositions useful in the
invention contain at least one thermal stabilizer and/or reaction
products thereof.
[0102] In one aspect, the polyesters useful in the invention
contain no branching agent, or alternatively, at least one
branching agent is added either prior to or during polymerization
of the polyester.
[0103] In one aspect, the polyesters useful in the invention
contain at least one branching agent without regard to the method
or sequence in which it is added.
[0104] In one aspect, the polyesters useful in the invention are
made from no 1,3-propanediol, or, 1,4-butanediol, either singly or
in combination. In other aspects, 1,3-propanediol or
1,4-butanediol, either singly or in combination, may be used in the
making of the polyesters useful in this invention.
[0105] In one aspect of the invention, the mole % of
cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol useful in certain
polyesters useful in the invention is greater than 50 mole % or
greater than 55 mole % of
cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol or greater than 70 mole
% of cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol; wherein the total
mole percentage of cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol and
trans-2,2,4,4-tetramethyl-1,3-cyclobutanediol is equal to a total
of 100 mole %.
[0106] In one aspect of the invention, the mole % of the isomers of
2,2,4,4-tetramethyl-1,3-cyclobutanediol useful in certain
polyesters useful in the invention is from 30 to 70 mole % of
cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol or from 30 to 70 mole %
of trans-2,2,4,4-tetramethyl-1,3-cyclobutanediol, or from 40 to 60
mole % of cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol or from 40 to
60 mole % of trans-2,2,4,4-tetramethyl-1,3-cyclobutanediol, wherein
the total mole percentage of
cis-2,2,4,4-tetramethyl-1,3-cyclobutanediol and
trans-2,2,4,4-tetramethyl-1,3-cyclobutanediol is equal to a total
of 100 mole %.
[0107] In one aspect, the polyester compositions are useful in
ophthalmic product(s) including, but not limited to, extruded
and/or molded articles including but not limited to, injection
molded articles, extruded articles, cast extrusion articles,.
[0108] Also, in one aspect, use of the polyester compositions of
the invention minimizes and/or eliminates the drying step prior to
melt processing or thermoforming.
[0109] In one aspect, certain polyesters useful in the invention
can be amorphous or semicrystalline. In one aspect, certain
polyesters useful in the invention can have a relatively low
crystallinity. Certain polyesters useful in the invention can thus
have a substantially amorphous morphology, meaning that the
polyesters comprise substantially unordered regions of polymer.
BRIEF DESCRIPTION OF THE DRAWINGS
[0110] FIG. 1 is a graph showing the effect of comonomer on the
fastest crystallization half-times of modified PCT
copolyesters.
[0111] FIG. 2 is a graph showing the effect of comonomer on the
brittle-to-ductile transition temperature (T.sub.bd) in a notched
Izod impact strength test (ASTM D256, 1/8-in thick, 10-mil
notch).
[0112] FIG. 3 is a graph showing the effect of
2,2,4,4-tetramethyl-1,3-cyclobutanediol composition on the glass
transition temperature (Tg) of the copolyester.
DETAILED DESCRIPTION OF THE INVENTION
[0113] The present invention may be understood more readily by
reference to the following detailed description of certain
embodiments of the invention and the working examples.
[0114] In accordance with the purpose(s) of this invention, certain
embodiments of the invention are described in the Summary of the
Invention and are further described herein below. Also, other
embodiments of the invention are described herein.
[0115] It is believed that the polyester(s) and/or polyester
composition(s) which are included in the ophthalmic product(s) of
the invention described herein can have a unique combination of two
or more physical properties such as high impact strengths, moderate
to high glass transition temperatures, chemical resistance,
hydrolytic stability, toughness, low ductile-to-brittle transition
temperatures, good color and clarity, low densities, long
crystallization half-times, and good processability thereby easily
permitting them to be formed into articles. In some of the
embodiments of the invention, the polyesters have a unique
combination of the properties of good impact strength, heat
resistance, chemical resistance, density and/or the combination of
the properties of good impact strength, heat resistance, and
processability and/or the combination of two or more of the
described properties, that have never before been believed to be
present in ophthalmic product(s) comprising the polyester
compositions which comprise the polyester(s) as disclosed
herein.
[0116] "Ophthalmic product" as used herein, refers to prescription
eyeglass lenses, nonprescription eyeglass lenses, sunglass lenses,
and eyeglass and sunglass frames.
[0117] In one embodiment, the ophthalmic product is chosen from
tinted eyeglass lenses and hardcoated eyeglass lenses. In one
embodiment, the eyeglass lenses, such as the tinted eyeglass lenses
or hardcoated eyeglass lenses, comprise at least one polarizing
film or polarizing additive.
[0118] In one embodiment, when the product is a lens, the
ophthalmic product has a refractive index ranging from 1.54 to
1.56.
[0119] In one embodiment, the ophthalmic product can have at least
one property chosen from toughness, clarity, chemical resistance
(e.g., for withstanding lens cleaners, oils, hair products, etc.),
Tg, and hydrolytic stability.
[0120] The term "polyester", as used herein, is intended to include
"copolyesters" and is understood to mean a synthetic polymer
prepared by the reaction of one or more difunctional carboxylic
acids and/or multifunctional carboxylic acids with one or more
difunctional hydroxyl compounds and/or multifunctional hydroxyl
compounds. Typically the difunctional carboxylic acid can be a
dicarboxylic acid and the difunctional hydroxyl compound can be a
dihydric alcohol such as, for example, glycols. Furthermore, as
used in this application, the term "diacid" or "dicarboxylic acid"
includes multifunctional acids, such as branching agents. The term
"glycol" as used in this application includes, but is not limited
to, diols, glycols, and/or multifunctional hydroxyl compounds.
Alternatively, the difunctional carboxylic acid may be a hydroxy
carboxylic acid such as, for example, p-hydroxybenzoic acid, and
the difunctional hydroxyl compound may be an aromatic nucleus
bearing 2 hydroxyl substituents such as, for example, hydroquinone.
The term "residue", as used herein, means any organic structure
incorporated into a polymer through a polycondensation and/or an
esterification reaction from the corresponding monomer. The term
"repeating unit", as used herein, means an organic structure having
a dicarboxylic acid residue and a diol residue bonded through a
carbonyloxy group. Thus, for example, the dicarboxylic acid
residues may be derived from a dicarboxylic acid monomer or its
associated acid halides, esters, salts, anhydrides, or mixtures
thereof. As used herein, therefore, the term dicarboxylic acid is
intended to include dicarboxylic acids and any derivative of a
dicarboxylic acid, including its associated acid halides, esters,
half-esters, salts, half-salts, anhydrides, mixed anhydrides, or
mixtures thereof, useful in a reaction process with a diol to make
polyester. As used herein, the term "terephthalic acid" is intended
to include terephthalic acid itself and residues thereof as well as
any derivative of terephthalic acid, including its associated acid
halides, esters, half-esters, salts, half-salts, anhydrides, mixed
anhydrides, or mixtures thereof or residues thereof useful in a
reaction process with a diol to make polyester.
[0121] In one embodiment, terephthalic acid may be used as the
starting material. In another embodiment, dimethyl terephthalate
may be used as the starting material. In another embodiment,
mixtures of terephthalic acid and dimethyl terephthalate may be
used as the starting material and/or as an intermediate
material.
[0122] The polyesters used in the present invention typically can
be prepared from dicarboxylic acids and diols which react in
substantially equal proportions and are incorporated into the
polyester polymer as their corresponding residues. The polyesters
of the present invention, therefore, can contain substantially
equal molar proportions of acid residues (100 mole %) and diol
(and/or multifunctional hydroxyl compounds) residues (100 mole %)
such that the total moles of repeating units is equal to 100 mole
%. The mole percentages provided in the present disclosure,
therefore, may be based on the total moles of acid residues, the
total moles of diol residues, or the total moles of repeating
units. For example, a polyester containing 30 mole % isophthalic
acid, based on the total acid residues, means the polyester
contains 30 mole % isophthalic acid residues out of a total of 100
mole % acid residues. Thus, there are 30 moles of isophthalic acid
residues among every 100 moles of acid residues. In another
example, a polyester containing 30 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol, based on the total diol
residues, means the polyester contains 30 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues out of a total of
100 mole % diol residues. Thus, there are 30 moles of
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues among every 100
moles of diol residues.
[0123] In other aspects of the invention, the Tg of the polyesters
useful in the ophthalmic product(s) of the invention can be at
least one of the following ranges: 100 to 200.degree. C.; 100 to
190.degree. C.; 100 to 180.degree. C.; 100 to 170.degree. C.; 100
to 160.degree. C.; 100 to 155.degree. C.; 100 to 150.degree. C.;
100 to 145.degree. C.; 100 to 140.degree. C.; 100 to 138.degree.
C.; 100 to 135.degree. C.; 100 to 130.degree. C.; 100 to
125.degree. C.; 100 to 120.degree. C.; 100 to 115.degree. C;. 100
to 110.degree. C;. 105 to 200.degree. C.; 105 to 190.degree. C.;
105 to 180.degree. C.; 105 to 170.degree. C.; 105 to 160.degree.
C.; 105 to 155.degree. C.; 105 to 150.degree. C.; 105 to
145.degree. C.; 105 to 140.degree. C.; 105 to 138.degree. C.; 105
to 135.degree. C.; 105 to 130.degree. C.; 105 to 125.degree. C.;
105 to 120.degree. C.; 105 to 115.degree. C.; 105 to 110.degree. C.
greater than 105 to 125.degree. C.; greater than 105 to 120.degree.
C.; greater than 105 to 115.degree. C.; greater than 105 to
110.degree. C.; 110 to 200.degree. C.; 110 to 190.degree. C.; 110
to 180.degree. C.; 110 to 170.degree. C.; 110 to 160.degree. C.;
110 to 155.degree. C.; 110 to 150.degree. C.; 110 to 145.degree.
C.; 110 to 140.degree. C.; 110 to 138.degree. C.; 110 to
135.degree. C.; 110 to 130.degree. C.; 110 to 125.degree. C.; 110
to 120.degree. C.; 110 to 115.degree. C.; 115to 200.degree. C.; 115
to 190.degree. C.; 115 to 180.degree. C.; 115 to 170.degree. C.;
115 to 160.degree. C.; 115to 155.degree. C.; 115 to 150.degree. C.;
115 to 145.degree. C.; 115 to 140.degree. C.; 115 to 138.degree.
C.; 115 to 135.degree. C.; 110 to 130.degree. C.; 115 to
125.degree. C.; 115 to 120.degree. C.; 120 to 200.degree. C.; 120
to 190.degree. C.; 120 to 180.degree. C.; 120 to 170.degree. C.;
120 to 160.degree. C.; 120 to 155.degree. C.; 120 to 150.degree.
C.; 120 to 145.degree. C.; 120 to 140.degree. C.; 120 to
138.degree. C.; 120 to 135.degree. C.; 120 to 130.degree. C.; 125
to 200.degree. C.; 125 to 190.degree. C.; 125 to 180.degree. C.;
125 to 170.degree. C.; 125 to 160.degree. C; 125 to 155.degree. C.;
125 to 150.degree. C.; 125 to 145.degree. C.; 125 to 140.degree.
C.; 125 to 138.degree. C.; 125 to 135.degree. C.; 127 to
200.degree. C.; 127 to 190.degree. C.; 127 to 180.degree. C.; 127
to 170.degree. C.; 127 to 160.degree. C.; 127 to 150.degree. C.;
127 to 145.degree. C.; 127 to 140.degree. C.; 127 to 138.degree.
C.; 127 to 135.degree. C.; 130 to 200.degree. C.; 130 to
190.degree. C.; 130 to 180.degree. C.; 130 to 170.degree. C.; 130
to 160.degree. C.; 130 to 155.degree. C.; 130 to 150.degree. C.;
130 to 145.degree. C.; 130 to 140.degree. C.; 130 to 138.degree.
C.; 130 to 135.degree. C.; 135 to 200.degree. C.; 135 to
190.degree. C.; 135 to 180.degree. C.; 135 to 170.degree. C.; 135
to 160.degree. C.; 135 to 155.degree. C.; 135 to 150.degree. C.;
135 to 145.degree. C.; 135 to 140.degree. C.; 140 to 200.degree.
C.; 140 to 190.degree. C; 140 to 180.degree. C.; 140 to 170.degree.
C.; 140 to 160.degree. C.; 140 to 155.degree. C.; 140 to
150.degree. C.; 140 to 145.degree. C.; 148 to 200.degree. C.; 148
to 190.degree. C.; 148 to 180.degree. C.; 148 to 170.degree. C.;
148 to 160.degree. C.; 148 to 155.degree. C.; 148 to 150.degree.
C.; 150 to 200.degree. C.; 150 to 190.degree. C.; 150 to
180.degree. C.; 150 to 170.degree. C.; 150 to 160; 155 to
190.degree. C.; 155 to 180.degree. C.; 155 to 170.degree. C.; and
155 to 165.degree. C.
[0124] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 10 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 90 mole %
1,4-cyclohexanedimethanol, 10 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to 90 mole %
1,4-cyclohexanedimethanol; 10 to less than 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and greater than 50 to 90
mole % 1,4-cyclohexanedimethanol; 10 to 45 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 55 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 60 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 35 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 65 to 90 mole %
1,4-cyclohexanedimethanol; 10 to less than 35 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and greater than 65 up to
90 mole % 1,4-cyclohexanedimethanol; 10 to 30 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 70 to 90 mole %
1,4-cyclohexanedimethanol; 10 to 25 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and greater than 75 to 90
mole % 1,4-cyclohexanedimethanol; 11 to 25 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 75 to 89 mole %
1,4-cyclohexanedimethanol; 12 to 25 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 75 to 88 mole %
1,4-cyclohexanedimethanol; and 13 to 25 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 75 to 87 mole %
1,4-cyclohexanedimethanol;
[0125] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 14 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 86 mole %
1,4-cyclohexanedimethanol,14 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 86 mole %
1,4-cyclohexanedimethanol; and 14 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to 86 mole %
1,4-cyclohexanedimethanol.
[0126] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 14 to less than 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and greater than 50 up to
86 mole % 1,4-cyclohexanedimethanol; 14 to 45 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 55 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 60 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 35 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 65 to 86 mole %
1,4-cyclohexanedimethanol; 14 to 30 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 70 to 86 mole %
1,4-cyclohexanedimethanol; and 14 to 25 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 75 to 86 mole %
1,4-cyclohexanedimethanol.
[0127] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 15 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 85 mole %
1,4-cyclohexanedimethanol, 15 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 85 mole %
1,4-cyclohexanedimethanol; and 15 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to 85 mole %
1,4-cyclohexanedimethanol.
[0128] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 15 to less than 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and greater than 50 up to
85 mole % 1,4-cyclohexanedimethanol; 15 to 45 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 55 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 60 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 35 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 65 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 30 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 70 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 25 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 75 to 85 mole %
1,4-cyclohexanedimethanol; 15 to 20 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 75 to 80 mole %
1,4-cyclohexanedimethanol; and 17 to 23 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 77 to 83 mole %
1,4-cyclohexanedimethanol.
[0129] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 20 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 80 mole %
1,4-cyclohexanedimethanol, 20 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 45 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 55 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 60 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 35 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 65 to 80 mole %
1,4-cyclohexanedimethanol; 20 to 30 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 70 to 80 mole %
1,4-cyclohexandimethanol; and 20 to 25 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 75 to 80 mole %
1,4-cyclohexanedimethanol.
[0130] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 25 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 75 mole %
1,4-cyclohexanedimethanol, 25 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 45 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 55 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 60 to 75 mole %
1,4-cyclohexanedimethanol; 25 to 35 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 65 to 75 mole %
1,4-cyclohexanedimethanol; and 25 to 30 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 70 to 75 mole %
1,4-cyclohexanedimethanol.
[0131] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 30 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 70 mole %
1,4-cyclohexanedimethanol, 30 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to 70 mole %
1,4-cyclohexanedimethanol; 30 to less than 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and greater than 50 to 70
mole % 1,4-cyclohexanedimethanol; 30 to 45 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 55 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 60 to 70 mole %
1,4-cyclohexanedimethanol; 30 to 35 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 65 to 70 mole %
1,4-cyclohexanedimethanol.
[0132] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 35 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 65 mole %
1,4-cyclohexanedimethanol, 35 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to 65 mole %
1,4-cyclohexanedimethanol; 35 to less than 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and greater than 50 to 65
mole % 1,4-cyclohexanedimethanol; 35 to 45 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 55 to 65 mole %
1,4-cyclohexanedimethanol; 35 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 60 to 65 mole %
1,4-cyclohexanedimethanol.
[0133] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 37 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 63 mole %
1,4-cyclohexanedimethanol; 37 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 63 mole %
1,4-cyclohexanedimethanol; 37 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 63 mole %
1,4-cyclohexanedimethanol; 37 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 63 mole %
1,4-cyclohexanedimethanol; 37 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 63 mole %
1,4-cyclohexanedimethanol, 37 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 63 mole %
1,4-cyclohexanedimethanol; 37 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 63 mole %
1,4-cyclohexanedimethanol; 37 to 63 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 37 to 63 mole %
1,4-cyclohexanedimethanol; 37 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 63 mole %
1,4-cyclohexanedimethanol; 37 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 63 mole %
1,4-cyclohexanedimethanol; 37 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to 63 mole %
1,4-cyclohexanedimethanol; 37 to less than 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and greater than 50 to 63
mole % 1,4-cyclohexanedimethanol; 37 to 45 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 55 to 63 mole %
1,4-cyclohexanedimethandl; 37 to 40 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 60 to 63 mole %
1,4-cyclohexanedimethanol.
[0134] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 40 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 60 mole %
1,4-cyclohexanedimethanol; 40 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 60 mole %
1,4-cyclohexanedimethanol; 40 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 60 mole %
1,4-cyclohexanedimethanol; 40 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 60 mole %
1,4-cyclohexanedimethanol; 40 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 60 mole %
1,4-cyclohexanedimethanol, 40 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 60 mole %
1,4-cyclohexanedimethanol; 40 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 60 mole %
1,4-cyclohexanedimethanol; 40 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 60 mole %
1,4-cyclohexanedimethanol; 40 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 60 mole %
1,4-cyclohexanedimethanol; 40 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 60 mole %
1,4-cyclohexanedimethanol; 40 to less than 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and greater than 50 to 60
mole % 1,4-cyclohexanedimethanol; 40 to 50 mole %
2,2,4,4-tetramethyl-i1,3-cyclobutanediol and 50 to 60 mole %
1,4-cyclohexanedimethanol; and 40 to 45 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 55 to 60 mole %
1,4-cyclohexanedimethanol.
[0135] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 45 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 55 mole %
1,4-cyclohexanedimethanol; 45 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 55 mole %
1,4-cyclohexanedimethanol; 45 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 55 mole %
1,4-cyclohexanedimethanol; 45 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 55 mole %
1,4-cyclohexanedimethanol; 45 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 55 mole %
1,4-cyclohexanedimethanol, 45 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 55 mole %
1,4-cyclohexanedimethanol; 45 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 55 mole %
1,4-cyclohexanedimethanol; 45 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 55 mole %
1,4-cyclohexanedimethanol; 45 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 55 mole %
1,4-cyclohexanedimethanol; greater than 45 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to less than 55 mole
% 1,4-cyclohexanedimethanol; 45 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 55 mole %
1,4-cyclohexanedimethanol; and 45 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to 55 mole %
1,4-cyclohexanedimethanol.
[0136] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: greater than 50 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to less than 50 mole
% 1,4-cyclohexanedimethanol; greater than 50 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to less than 50 mole
% 1,4-cyclohexanedimethanol; greater than 50 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to less than 50 mole
% 1,4-cyclohexanedimethanol; greater than 50 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to less than 50 mole
% 1,4-cyclohexanedimethanol; greater than 50 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to less than 50 mole
% 1,4-cyclohexanedimethanol, greater than 50 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to less than 50 mole
% 1,4-cyclohexanedimethanol; greater than 50 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to less than 50 mole
% 1,4-cyclohexanedimethanol; greater than 50 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to less than 50 mole
% 1,4-cyclohexanedimethanol; greater than 50 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to less than 50 mole
% 1,4-cyclohexanedimethanol; and greater than 50 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to less than 50 mole
% 1,4-cyclohexanedimethanol.
[0137] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 50 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 50 mole %
1,4-cyclohexanedimethanol; 50 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 50 mole %
1,4-cyclohexanedimethanol; 50 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 50 mole %
1,4-cyclohexanedimethanol; 50 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 50 mole %
1,4-cyclohexanedimethanol; 50 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 50 mole %
1,4-cyclohexanedimethanol, 50 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 50 mole %
1,4-cyclohexanedimethanol; 50 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 50 mole %
1,4-cyclohexanedimethanol; 50 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 50 mole %
1,4-cyclohexanedimethanol; 50 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 50 mole %
1,4-cyclohexanedimethanol; and 50 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 50 mole %
1,4-cyclohexanedimethanol.
[0138] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 55 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 45 mole %
1,4-cyclohexanedimethanol; 55 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 45 mole %
1,4-cyclohexanedimethanol; 55 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 45 mole %
1,4-cyclohexanedimethanol; 55 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 45 mole %
1,4-cyclohexanedimethanol; 55 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 45 mole %
1,4-cyclohexanedimethanol, 55 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 45 mole %
1,4-cyclohexanedimethanol; 55 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 45 mole %
1,4-cyclohexanedimethanol; 55 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 45 mole %
1,4-cyclohexanedimethanol; and 55 to 60 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 40 to 45 mole %
1,4-cyclohexanedimethanol.
[0139] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 60 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 40 mole %
1,4-cyclohexanedimethanol; 60 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 40 mole %
1,4-cyclohexanedimethanol; 60 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 40 mole %
1,4-cyclohexanedimethanol; 60 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 40 mole %
1,4-cyclohexanedimethanol; 60 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 40 mole %
1,4-cyclohexanedimethanol, 60 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 40 mole %
1,4-cyclohexanedimethanol; and 60 to 70 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 30 to 40 mole %
1,4-cyclohexanedimethanol.
[0140] In other aspects of the invention, the glycol component for
the polyesters useful in the invention include but are not limited
to at least one of the following combinations of ranges: 65 to 99
mole % 2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 35 mole %
1,4-cyclohexanedimethanol; 65 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 35 mole %
1,4-cyclohexanedimethanol; 65 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 35 mole %
1,4-cyclohexanedimethanol; 65 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 35 mole %
1,4-cyclohexanedimethanol; 65 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 35 mole %
1,4-cyclohexanedimethanol, 65 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 35 mole %
1,4-cyclohexanedimethanol; and 65 to 70 mole
%.2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 40 mole %
1,4-cyclohexanedimethanol.
[0141] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include.but are not limited to at least one of the following
combinations of ranges: 70 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 30 mole %
1,4-cyclohexanedimethanol; 70 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 30 mole %
1,4-cyclohexanedimethanol; 70 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 30 mole %
1,4-cyclohexanedimethanol; 70 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 30 mole %
1,4-cyclohexanedimethanol; 70 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 20 to 30 mole %
1,4-cyclohexanedimethanol, and 70 to 75 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 25 to 30 mole %
1,4-cyclohexanedimethanol.
[0142] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 75 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 25 mole %
1,4-cyclohexanedimethanol; 75 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 25 mole %
1,4-cyclohexanedimethanol; 75 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 25 mole %
1,4-cyclohexanedimethanol; 75 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 25 mole %
1,4-cyclohexanedimethanol, and 75 to 80 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 20 mole %
1,4-cyclohexanedimethanol.
[0143] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: 80 to 99 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1 to 20 mole %
1,4-cyclohexanedimethanol; 80 to 95 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 5 to 20 mole %
1,4-cyclohexanedimethanol; 80 to 90 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 10 to 20 mole %
1,4-cyclohexanedimethanol, and 80 to 85 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 15 to 20 mole %
1,4-cyclohexanedimethanol.
[0144] In other aspects of the invention, the glycol component for
the polyesters useful in the ophthalmic product(s) of the invention
include but are not limited to at least one of the following
combinations of ranges: greater than 45 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to less than 55 mole
% 1,4-cyclohexanedimethanol; greater than 45 to 50 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 50 to less than 55 mole
% 1,4-cyclohexanedimethanol; 46 to 55 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 45 to 54 mole %
1,4-cyclohexanedimethanol; and 46 to 65 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol and 35 to 54 mole %
1,4-cyclohexanedimethanol.
[0145] In addition to the diols set forth above, the polyesters
useful in the polyester compositions of the ophthalmic product(s)
of the invention may also be made from 1,3-propanediol,
1,4-butanediol, or mixtures thereof. It is contemplated that
compositions of the invention made from 1,3-propanediol,
1,4-butanediol, or mixtures thereof can possess at least one of the
Tg ranges described herein, at least one of the inherent viscosity
ranges described herein, and/or at least one of the glycol or
diacid ranges described herein. In addition or in the alternative,
the polyesters made from 1,3-propanediol or 1,4-butanediol or
mixtures thereof may also be made from 1,4-cyclohexanedmethanol in
at least one of the following amounts: from 0.1 to 99 mole %; from
0.1 to 90 mole %; from 0.1 to 80 mole %; from 0.1 to 70 mole %;
from 0.1 to 60 mole %; from 0.1 to 50 mole %; from 0.1 to 40 mole
%; from 0.1 to 35 mole %; from 0.1 to 30 mole %; from 0.1 to 25
mole %; from 0.1 to 20 mole %; from 0.1 to 15 mole %; from 0.1 to
10 mole %; from 0.1 to 5 mole %; from 1 to 99 mole %; from 1 to 90
mole %, from 1 to 80 mole %; from 1 to 70 mole %; from 1 to 60 mole
%; from 1 to 50 mole %; from 1 to 40 mole %; from 1 to 35 mole %;
from 1 to 30 mole %; from 1 to 25 mole %; from 1 to 20 mole %; from
1 to 15 mole %; from 1 to 10 mole %; from 1 to 5 mole %; from 5 to
99 mole %, from 5 to 90 mole %, from 5 to 80 mole %; 5 to 70 mole
%; from 5 to 60 mole %; from 5 to 50 mole %; from 5 to 40 mole %;
from 5 to 35 mole %; from 5 to 30 mole %; from 5 to 25 mole %; from
5 to 20 mole %; and from 5 to 15 mole %; from 5 to 10 mole %; from
10 to 99 mole %; from 10 to 90 mole %; from 10 to 80 mole %; from
10 to 70 mole %; from 10 to 60 mole %; from 10 to 50 mole %; from
10 to 40 mole %; from 10 to 35 mole %; from 10 to 30 mole %; from
10 to 25 mole %; from 10 to 20 mole %; from 10 to 15 mole %; from
20 to 99 mole %; from 20 to 90 mole %; from 20 to 80 mole %; from
20 to 70 mole %; from 20 to 60 mole %; from 20 to 50 mole %; from
20 to 40 mole %; from 20 to 35 mole %; from 20 to 30 mole %; and
from 20 to 25 mole
[0146] For certain embodiments of the invention, the polyesters
useful in the invention may exhibit at least one of the following
inherent viscosities as determined in 60/40 (wt/wt)
phenol/tetrachloroethane at a concentration of 0.5 g/100 ml at
25.degree. C.: 0.10 to 1.2 dL/g; 0.10 to 1.1 dL/g; 0.10 to 1 dL/g;
0.10 to less than 1 dL/g; 0.10 to 0.98 dL/g; 0.10 to 0.95 dL/g;
0.10 to 0.90 dL/g; 0.10 to 0.85 dL/g; 0.10 to 0.80 dL/g; 0.10 to
0.75 dL/g; 0.10 to less than 0.75 dL/g; 0.10 to 0.72 dL/g; 0.10 to
0.70 dL/g; 0.10 to less than 0.70 dL/g; 0.10 to 0.68 dL/g; 0.10 to
less than 0.68 dL/g; 0.10 to 0.65 dL/g; 0.20 to 1.2 dL/g; 0.20 to
1.1 dL/g; 0.20 to 1 dL/g; 0.20 to less than 1 dL/g; 0.20 to 0.98
dL/g; 0.20 to 0.95 dL/g; 0.20 to 0.90 dL/g; 0.20 to 0.85 dL/g; 0.20
to 0.80 dL/g; 0.20 to 0.75 dL/g; 0.20 to less than 0.75 dL/g; 0.20
to 0.72 dL/g; 0.20 to 0.70 dL/g; 0.20 to less than 0.70 dL/g; 0.20
to 0.68 dL/g; 0.20 to less than 0.68 dL/g; 0.20 to 0.65 dL/g; 0.35
to 1.2 dL/g; 0.35 to 1.1 dL/g; 0.35 to 1 dL/g; 0.35 to less than 1
dL/g; 0.35 to 0.98 dL/g; 0.35 to 0.95 dL/g; 0.35 to 0.90 dL/g; 0.35
to 0.85 dL/g; 0.35 to 0.80 dL/g; 0.35 to 0.75 dL/g; 0.35 to less
than 0.75 dL/g; 0.35 to 0.72 dL/g; 0.35 to 0.70 dL/g; 0.35 to less
than 0.70 dL/g; 0.35 to 0.68 dL/g; 0.35 to less than 0.68 dL/g;
0.35 to 0.65 dL/g; 0.40 to 1.2 dL/g; 0.40 to 1.1 dL/g; 0.40 to 1
dL/g; 0.40 to less than 1 dL/g; 0.40 to 0.98 dL/g; 0.40 to 0.95
dL/g; 0.40 to 0.90 dL/g; 0.40 to 0.85 dL/g; 0.40 to 0.80 dL/g; 0.40
to 0.75 dL/g; 0.40 to less than 0.75 dL/g; 0.40 to 0.72 dL/g; 0.40
to 0.70 dL/g; 0.40 to less than 0.70 dL/g; 0.40 to 0.68 dL/g; 0.40
to less than 0.68 dL/g; 0.40 to 0.65 dL/g; greater than 0.42 to 1.2
dL/g; greater than 0.42 to 1.1 dL/g; greater than 0.42 to 1 dL/g;
greater than 0.42 to less than 1 dL/g; greater than 0.42 to 0.98
dL/g; greater than 0.42 to 0.95 dL/g; greater than 0.42 to 0.90
dL/g; greater than 0.42 to 0.85 dL/g; greater than 0.42 to 0.80
dL/g; greater than 0.42 to 0.75 dL/g; greater than 0.42 to less
than 0.75 dL/g; greater than 0.42 to 0.72 dL/g; greater than 0.42
to less than 0.70 dL/g; greater than 0.42 to 0.68 dL/g; greater
than 0.42 to less than 0.68 dL/g; and greater than 0.42 to 0.65
dL/g.
[0147] For certain embodiments of the invention, the polyesters
useful in the invention may exhibit at least one of the following
inherent viscosities as determined in 60/40 (wt/wt)
phenol/tetrachloroethane at a concentration of 0.5 g/100 ml at
25.degree. C: 0.45 to 1.2 dL/g; 0.45 to 1.1 dL/g; 0.45 to 1 dL/g;
0.45 to 0.98 dL/g; 0.45 to 0.95 dL/g; 0.45 to 0.90 dL/g; 0.45 to
0.85 dL/g; 0.45 to 0.80 dL/g; 0.45 to 0.75 dL/g; 0.45 to less than
0.75 dL/g; 0.45 to 0.72 dL/g; 0.45 to 0.70 dL/g; 0.45 to less than
0.70 dL/g; 0.45 to 0.68 dL/g; 0.45 to less than 0.68 dL/g; 0.45 to
0.65 dL/g; 0.50 to 1.2 dL/g; 0.50 to 1.1 dL/g; 0.50 to 1 dL/g; 0.50
to less than 1 dL/g; 0.50 to 0.98 dL/g; 0.50 to 0.95 dL/g; 0.50 to
0.90 dL/g; 0.50 to 0.85 dL/g; 0.50 to 0.80 dL/g; 0.50 to 0.75 dL/g;
0.50 to less than 0.75 dL/g; 0.50 to 0.72 dL/g; 0.50 to 0.70 dL/g;
0.50 to less than 0.70 dL/g; 0.50 to 0.68 dL/g; 0.50 to less than
0.68 dL/g; 0.50 to 0.65 dL/g; 0.55 to 1.2 dL/g; 0.55 to 1.1 dL/g;
0.55 to 1 dL/g; 0.55 to less than 1 dL/g; 0.55 to 0.98 dL/g; 0.55
to 0.95 dL/g; 0.55 to 0.90 dL/g; 0.55 to 0.85 dL/g; 0.55 to 0.80
dL/g; 0.55 to 0.75 dL/g; 0.55 to less than 0.75 dL/g; 0.55 to 0.72
dL/g; 0.55 to 0.70 dL/g; 0.55 to less than 0.70 dL/g; 0.55 to 0.68
dL/g; 0.55 to less than 0.68 dL/g; 0.55 to 0.65 dL/g; 0.58 to 1.2
dL/g; 0.58 to 1.1 dL/g; 0.58 to 1 dL/g; 0.58 to less than 1 dL/g;
0.58 to 0.98 dL/g; 0.58 to 0.95 dL/g; 0.58 to 0.90 dL/g; 0.58 to
0.85 dL/g; 0.58 to 0.80 dL/g; 0.58 to 0.75 dL/g; 0.58 to less than
0.75 dL/g; 0.58 to 0.72 dL/g; 0.58 to 0.70 dL/g; 0.58 to less than
0.70 dL/g; 0.58 to 0.68 dL/g; 0.58 to less than 0.68 dL/g; 0.58 to
0.65 dL/g; 0.60 to 1.2 dL/g; 0.60 to 1.1 dL/g; 0.60 to 1 dL/g; 0.60
to less than 1 dL/g; 0.60 to 0.98 dL/g; 0.60 to 0.95 dL/g; 0.60 to
0.90 dL/g; 0.60 to 0.85 dL/g; 0.60 to 0.80 dL/g; 0.60 to 0.75 dL/g;
0.60 to less than 0.75 dL/g; 0.60 to 0.72 dL/g; 0.60 to 0.70 dL/g;
0.60 to less than 0.70 dL/g; 0.60 to 0.68 dL/g; 0.60 to less than
0.68 dL/g; 0.60 to 0.65 dL/g; 0.65 to 1.2 dL/g; 0.65 to 1.1 dL/g;
0.65 to 1 dL/g; 0.65 to less than 1 dL/g; 0.65 to 0.98 dL/g; 0.65
to 0.95 dL/g; 0.65 to 0.90 dL/g; 0.65 to 0.85 dL/g; 0.65 to 0.80
dL/g; 0.65 to 0.75 dL/g; 0.65 to less than 0.75 dL/g; 0.65 to 0.72
dL/g; 0.65 to 0.70 dL/g; 0.65 to less than 0.70 dL/g; 0.68 to 1.2
dL/g; 0.68 to 1.1 dL/g; 0.68 to 1 dL/g; 0.68 to less than 1 dL/g;
0.68 to 0.98 dL/g; 0.68 to 0.95 dL/g; 0.68 to 0.90 dL/g; 0.68 to
0.85 dL/g; 0.68 to 0.80 dL/g; 0.68 to 0.75 dL/g; 0.68 to less than
0.75 dL/g; 0.68 to 0.72 dL/g; greater than 0.76 dug to 1.2 dL/g;
greater than 0.76 dL/g to 1.1 dL/g; greater than 0.76 dL/g to 1
dL/g; greater than 0.76 dL/g to less than 1 dL/g; greater than 0.76
dL/g to 0.98dL/g; greater than 0.76 dL/g to 0.95 dL/g; greater than
0.76 dL/g to 0.90 dL/g; greater than 0.80 dL/g to 1.2 dL/g; greater
than 0.80 dL/g to 1.1 dL/g; greater than 0.80 dL/g to 1 dL/g;
greater than 0.80 dL/g to less than 1 dL/g; greater than 0.80 dL/g
to 1.2 dL/g; greater than 0.80 dL/g to 0.98dL/g; greater than 0.80
dL/g to 0.95 dL/g; greater than 0.80 dL/g to 0.90 dL/g.
[0148] It is contemplated that compositions useful in the
ophthalmic product(s) of the invention can possess at least one of
the inherent viscosity ranges described herein and at least one of
the monomer ranges for the compositions described herein unless
otherwise stated. It is also contemplated that compositions useful
in the ophthalmic product(s) of the invention can posses at least
one of the Tg ranges described herein and at least one of the
monomer ranges for the compositions described herein unless
otherwise stated. It is also contemplated that compositions useful
in the ophthalmic product(s) of the invention can posses at least
one of the Tg ranges described herein, at least one of the inherent
viscosity ranges described herein, and at least one of the monomer
ranges for the compositions described herein unless otherwise
stated.
[0149] For the desired polyester, the molar ratio of cis/trans
2,2,4,4-tetramethyl-1,3-cyclobutanediol can vary from the pure form
of each or mixtures thereof. In certain embodiments, the molar
percentages for cis and/or trans
2,2,4,4,-tetramethyl-1,3-cyclobutanediol are greater than 50 mole %
cis and less than 50 mole % trans; or greater than 55 mole % cis
and less than 45 mole % trans; or 30 to 70 mole % cis and 70 to 30%
trans; or 40 to 60 mole % cis and 60 to 40 mole % trans; or 50 to
70 mole % trans and 50 to 30% cis or 50 to 70 mole % cis and 50 to
30% trans; or 60 to 70 mole % cis and 30 to 40 mole % trans; or
greater than 70 mole cis and less than 30 mole % trans; wherein the
total sum of the mole percentages for cis- and
trans-2,2,4,4-tetramethyl-1,3-cyclobutanediol is equal to 100 mole
%. The molar ratio of cis/trans 1,4-cyclohexandimethanol can vary
within the range of 50/50 to 0/100, such as between 40/60 to
20/80.
[0150] In certain embodiments, terephthalic acid or an ester
thereof, such as, for example, dimethyl terephthalate, or a mixture
of terephthalic acid and an ester thereof, makes up most or all of
the dicarboxylic acid component used to form the polyesters useful
in the invention. In certain embodiments, terephthalic acid
residues can make up a portion or all of the dicarboxylic acid
component used to form the present polyester at a concentration of
at least 70 mole %, such as at least 80 mole %, at least 90 mole %,
at least 95 mole %, at least 99 mole %, or 100 mole %. In certain
embodiments, higher amounts of terephthalic acid can be used in
order to produce a higher impact strength polyester. In one
embodiment, dimethyl terephthalate is part or all of the
dicarboxylic acid component used to make the polyesters useful in
the present invention. For the purposes of this disclosure, the
terms "terephthalic acid" and "dimethyl terephthalate" are used
interchangeably herein. In all embodiments, ranges of from 70 to
100 mole %; or 80 to 100 mole %; or 90 to 100 mole %; or 99 to 100
mole %; or 100 mole % terephthalic acid and/or dimethyl
terephthalate and/or mixtures thereof may be used.
[0151] In addition to terephthalic acid, the dicarboxylic acid
component of the polyester useful in the invention can comprise up
to 30 mole %, up to 20 mole %, up to 10 mole %, up to 5 mole %, or
up to 1 mole % of one or more modifying aromatic dicarboxylic
acids. Yet another embodiment contains 0 mole % modifying aromatic
dicarboxylic acids. Thus, if present, it is contemplated that the
amount of one or more modifying aromatic dicarboxylic acids can
range from any of these preceding endpoint values including, for
example, from 0.01 to 30 mole %, 0.01 to 20 mole %, from 0.01 to 10
mole %, from 0.01 to 5 mole % and from 0.01 to 1 mole. In one
embodiment, modifying aromatic dicarboxylic acids that may be used
in the present invention include but are not limited to those
having up to 20 carbon atoms, and which can be linear,
para-oriented, or symmetrical. Examples of modifying aromatic
dicarboxylic acids which may be used in this invention include, but
are not limited to, isophthalic acid, 4,4'-biphenyldicarboxylic
acid, 1,4-, 1,5-, 2,6-, 2,7-naphthalenedicarboxylic acid, and
trans-4,4'-stilbenedicarboxylic acid, and esters thereof. In one
embodiment, the modifying aromatic dicarboxylic acid is isophthalic
acid.
[0152] The carboxylic acid component of the polyesters useful in
the invention can be further modified with up to 10 mole %, such as
up to 5 mole % or up to 1 mole % of one or more aliphatic
dicarboxylic acids containing 2-16 carbon atoms, such as, for
example, malonic, succinic, glutaric, adipic, pimelic, suberic,
azelaic and dodecanedioic dicarboxylic acids. Certain embodiments
can also comprise 0.01 or more mole %, such as 0.1 or more mole %,
1 or more mole %, 5 or more mole %, or 10 or more mole % of one or
more modifying aliphatic dicarboxylic acids. Yet another embodiment
contains 0 mole % modifying aliphatic dicarboxylic acids. Thus, if
present, it is contemplated that the amount of one or more
modifying aliphatic dicarboxylic acids can range from any of these
preceding endpoint values including, for example, from 0.01 to 10
mole % and from 0.1 to 10 mole %. The total mole % of the
dicarboxylic acid component is 100 mole %.
[0153] Esters of terephthalic acid and the other modifying
dicarboxylic acids or their corresponding esters and/or salts may
be used instead of the dicarboxylic acids. Suitable examples of
dicarboxylic acid esters include, but are not limited to, the
dimethyl, diethyl, dipropyl, diisopropyl, dibutyl, and diphenyl
esters. In one embodiment, the esters are chosen from at least one
of the following: methyl, ethyl, propyl, isopropyl, and phenyl
esters.
[0154] The 1,4-cyclohexanedimethanol may be cis, trans, or a
mixture thereof, for example a cis/trans ratio of 60:40 to 40:60.
In another embodiment, the trans-1,4-cyclohexanedimethanol can be
present in an amount of 60 to 80 mole %.
[0155] The glycol component of the polyester portion of the
polyester composition useful in the invention can contain 25 mole %
or less of one or more modifying glycols which are not
2,2,4,4-tetramethyl-1,3-cyclobutanediol or
1,4-cyclohexanedimethanol; in one embodiment, the polyesters useful
in the invention may contain less than 15 mole % of one or more
modifying glycols. In another embodiment, the polyesters useful in
the invention can contain 10 mole % or less of one or more
modifying glycols. In another embodiment, the polyesters useful in
the invention can contain 5 mole % or less of one or more modifying
glycols. In another embodiment, the polyesters useful in the
invention can contain 3 mole % or less of one or more modifying
glycols. In another embodiment, the polyesters useful in the
invention can contain 0 mole % modifying glycols. Certain
embodiments can also contain 0.01 or more mole %, such as 0.1 or
more mole %, 1 or more mole %, 5 or more mole %, or 10 or more mole
% of one or more modifying glycols. Thus, if present, it is
contemplated that the amount of one or more modifying glycols can
range from any of these preceding endpoint values including, for
example, from 0.01 to 15 mole % and from 0.1 to 10 mole %.
[0156] Modifying glycols useful in the polyesters useful in the
invention refer to diols other than
2,2,4,4,-tetramethyl-1,3-cyclobutanediol and
1,4-cyclohexanedimethanol and may contain 2 to 16 carbon atoms.
Examples of suitable modifying glycols include, but are not limited
to, ethylene glycol, 1,2-propanediol, 1,3-propanediol, neopentyl
glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, p-xylene
glycol or mixtures thereof. In one embodiment, the modifying glycol
is ethylene glycol. In another embodiment, the modifying glycols
are 1,3-propanediol and/or 1,4-butanediol. In another embodiment,
ethylene glycol is excluded as a modifying diol. In another
embodiment, 1,3-propanediol and 1,4-butanediol are excluded as
modifying diols. In another embodiment,
2,2-dimethyl-1,3-propanediol is excluded as a modifying diol.
[0157] The polyesters and/or the polycarbonates useful in the
polyesters compositions of the invention can comprise from 0 to 10
mole percent, for example, from 0.01 to 5 mole percent, from 0.01
to 1 mole percent, from 0.05 to 5 mole percent, from 0.05 to 1 mole
percent, or from 0.1 to 0.7 mole percent, based the total mole
percentages of either the diol or diacid residues; respectively, of
one or more residues of a branching monomer, also referred to
herein as a branching agent, having 3 or more carboxyl
substituents, hydroxyl substituents, or a combination thereof. In
certain embodiments, the branching monomer or agent may be added
prior to and/or during and/or after the polymerization of the
polyester. The polyester(s) useful in the invention can thus be
linear or branched. The polycarbonate can also be linear or
branched. In certain embodiments, the branching monomer or agent
may be added prior to and/or during and/or after the polymerization
of the polycarbonate.
[0158] Examples of branching monomers include, but are notlimited
to, multifunctional acids or multifunctional alcohols such as
trimellitic acid, trimellitic anhydride, pyromellitic dianhydride,
trimethylolpropane, glycerol, pentaerythritol, citric acid,
tartaric acid, 3-hydroxyglutaric acid and the like. In one
embodiment, the branching monomer residues can comprise 0.1 to 0.7
mole percent of one or more residues chosen from at least one of
the following: trimellitic anhydride, pyromellitic dianhydride,
glycerol, sorbitol, 1,2,6-hexanetriol, pentaerythritol,
trimethylolethane, and/or trimesic acid. The branching monomer may
be added to the polyester reaction mixture or blended with the
polyester in the form of a concentrate as described, for example,
in U.S. Pat. Nos. 5,654,347 and 5,696,176, whose disclosure
regarding branching monomers is incorporated herein by
reference.
[0159] The glass transition temperature (Tg) of the polyesters
useful in the invention was determined using a TA DSC 2920 from
Thermal Analyst Instrument at a scan rate of 20.degree. C./min.
[0160] Because of the long crystallization half-times (e.g.,
greater than 5 minutes) at 170.degree. C. exhibited by certain
polyesters useful in the present invention, it is possible to
produce injection molded ophthalmic products, compression molded
ophthalmic products, and solution casted ophthalmic products. The
polyesters of the invention can be amorphous or semicrystalline. In
one aspect, certain polyesters useful in the invention can have
relatively low crystallinity. Certain polyesters useful in the
invention can thus have a substantially amorphous morphology,
meaning that the polyesters comprise substantially unordered
regions of polymer.
[0161] In one embodiment, an "amorphous" polyester can have a
crystallization half-time of greater than 5 minutes at 170.degree.
C. or greater than 10 minutes at 170.degree. C. or greater than 50
minutes at 170.degree. C. or greater than 100 minutes at
170.degree. C. In one embodiment, of the invention, the
crystallization half-times are greater than 1,000 minutes at
170.degree. C. In another embodiment of the invention, the
crystallization half-times of the polyesters useful in the
invention are greater than 10,000 minutes at 170.degree. C. The
crystallization half time of the polyester, as used herein, may be
measured using methods well-known to persons of skill in the art.
For example, the crystallization half time of the polyester,
t.sub.1/2, can be determined by measuring the light transmission of
a sample via a laser and photo detector as a function of time on a
temperature controlled hot stage. This measurement can be done by
exposing the polymers to a temperature, T.sub.max, and then cooling
it to the desired temperature. The sample can then be held at the
desired temperature by a hot stage while transmission measurements
are made as a function of time. Initially, the sample can be
visually clear with high light transmission and becomes opaque as
the sample crystallizes. The crystallization half-time is the time
at which the light transmission is halfway between the initial
transmission and the final transmission. T.sub.max is defined as
the temperature required to melt the crystalline domains of the
sample (if crystalline domains are present). The sample can be
heated to Tmax to condition the sample prior to crystallization
half time measurement. The absolute Tmax temperature is different
for each composition. For example PCT can be heated to some
temperature greater than 290.degree. C. to melt the crystalline
domains.
[0162] As shown in Table 1 and FIG. 1 of the Examples,
2,2,4,4-tetramethyl-1,3-cyclobutanediol is more effective than
other comonomers such ethylene glycol and isophthalic acid at
increasing the crystallization half-time, i.e., the time required
for a polymer to reach half of its maximum crystallinity. By
decreasing the crystallization rate of PCT, i.e. increasing the
crystallization half-time, amorphous articles based on modified PCT
may be fabricated by methods known in the art such as extrusion,
injection molding, and the like. As shown in Table 1, these
materials can exhibit higher glass transition temperatures and
lower densities than other modified PCT copolyesters.
[0163] The polyesters can exhibit an improvement in toughness
combined with processability for some of the embodiments of the
invention. For example, it is unexpected that lowering the inherent
viscosity slightly of the polyesters useful in the invention
results in a more processable melt viscosity while retaining good
physical properties of the polyesters such as toughness and heat
resistance.
[0164] Increasing the content of 1,4-cyclohexanedimethanol in a
copolyester based on terephthalic acid, ethylene glycol, and
1,4-cyclohexanedimethanol can improve toughness, which can be
determined by the brittle-to-ductile transition temperature in a
notched Izod impact strength test as measured by ASTM D256. This
toughness improvement, by lowering of the brittle-to-ductile
transition temperature with 1,4-cyclohexanedimethanol, is believed
to occur due to the flexibility and conformational behavior of
1,4-cyclohexanedimethanol in the copolyester. Incorporating
2,2,4,4-tetramethyl-1,3-cyclobutanediol into PCT is believed to
improve toughness, by lowering the brittle-to-ductile transition
temperature, as shown in Table 2 and FIG. 2 of the Examples. This
is unexpected given the rigidity of
2,2,4,4-tetramethyl-1,3-cyclobutanediol.
[0165] In one embodiment, the melt viscosity of the polyester(s)
useful in the invention is less than 30,000 poise as measured a 1
radian/second on a rotary melt rheometer at 290.degree. C. In
another embodiment, the melt viscosity of the polyester(s) useful
in the invention is less than 20,000 poise as measured a 1
radian/second on a rotary melt rheometer at 290.degree. C.
[0166] In one embodiment, the melt viscosity of the polyester(s)
useful in the invention is less than 15,000 poise as measured at 1
radian/second (rad/sec) on a rotary melt rheometer at 290.degree.
C. In one embodiment, the melt viscosity of the polyester(s) useful
in the invention is less than 10,000 poise as measured at 1
radian/second (rad/sec) on a rotary melt rheometer at 290.degree.
C. In another embodiment, the melt viscosity of the polyester(s)
useful in the invention is less than 6,000 poise as measured at 1
radian/second on a rotary melt rheometer at 290.degree. C.
Viscosity at rad/sec is related to processability. Typical polymers
have viscosities of less than 10,000 poise as measured at 1
radian/second when measured at their processing temperature.
Polyesters are typically not processed above 290.degree. C.
Polycarbonate is typically processed at 290.degree. C. The
viscosity at 1 rad/sec of a typical 12 melt flow rate polycarbonate
is 7000 poise at 290.degree. C.
[0167] In one embodiment, certain polyesters useful in this
invention are visually clear. The term "visually clear" is defined
herein as an appreciable absence of cloudiness, haziness, and/or
muddiness, when inspected visually. When the polyesters are blended
with polycarbonate, including bisphenol A polycarbonates, the
blends can be visually clear in one aspect of the invention.
[0168] The present polyesters possess one or more of the following
properties. In other embodiments, the polyesters useful in the
invention may have a yellowness index (ASTM D-1925) of less than
50, such as less than 20.
[0169] In one embodiment, polyesters of this invention exhibit
superior notched toughness in thick sections. Notched Izod impact
strength, as described in ASTM D256, is a common method of
measuring toughness. When tested by the Izod method, polymers can
exhibit either a complete break failure mode, where the test
specimen breaks into two distinct parts, or a partial or no break
failure mode, where the test specimen remains as one part. The
complete break failure mode is associated with low energy failure.
The partial and no break failure modes are associated with high
energy failure. A typical thickness used to measure Izod toughness
is 1/8''. At this thickness, very few polymers are believed to
exhibit a partial or no break failure mode, polycarbonate being one
notable example. When the thickness of the test specimen is
increased to 1/4'', however, no commercial amorphous materials
exhibit a partial or no break failure mode. In one embodiment,
compositions of the present example exhibit a no break failure mode
when tested in Izod using a 1/4'' thick specimen.
[0170] The polyesters useful in the invention can possess one or
more of the following properties. In one embodiment, the polyesters
useful in the invention exhibit a notched Izod impact strength of
at least 150 J/m (3 ft-lb/in) at 23.degree. C. with a 10-mil notch
in a 3.2 mm (1/8-inch) thick bar determined according to ASTM D256;
in one embodiment, the polyesters useful in the invention exhibit a
notched Izod impact strength of at least (400 J/m) 7.5 ft-lb/in at
23.degree. C. with a 10-mil notch in a 3.2 mm (1/8-inch) thick bar
determined according to ASTM D256; in one embodiment, the
polyesters useful in the invention exhibit a notched Izod impact
strength of at least 1000 J/m (18 ft-lb/in) at 23.degree. C. with a
10-mil notch in a 3.2 mm (1/8-inch) thick bar determined according
to ASTM D256. In one embodiment, the polyesters useful in the
invention exhibit a notched Izod impact strength of at least 150
J/m (3 ft-lb/in) at 23.degree. C. with a 10-mil notch in a 6.4 mm
(1/4-inch) thick bar determined according to ASTM D256; in one
embodiment, the polyesters useful in the invention exhibit a
notched Izod impact strength of at least (400 J/m) 7.5 ft-lb/in at
23.degree. C. with a 10-mil notch in a 6.4 mm (1/4-inch) thick bar
determined according to ASTM D256; in one embodiment, the
polyesters useful in the invention exhibit a notched Izod impact
strength of at least 1000 J/m (18 ft-lb/in) at 23.degree. C. with a
10-mil notch in a 6.4 mm (1/4-inch) thick bar determined according
to ASTM D256.
[0171] In another embodiment, certain polyesters useful in the
invention can exhibit an increase in notched Izod impact strength
when measured at 0.degree. C. of at least 3% or at least 5% or at
least 10% or at least 15% as compared to the notched Izod impact
strength when measured at -5.degree. C. with a 10-mil notch in a
1/8-inch thick bar determined according to ASTM D256. In addition,
certain other polyesters can also exhibit a retention of notched
Izod impact strength within plus or minus 5% when measured at
0.degree. C. through 30.degree. C. with a 10-mil notch in a
1/8-inch thick bar determined according to ASTM D256.
[0172] In yet another embodiment, certain polyesters useful in the
invention can exhibit a retention in notched Izod impact strength
with a loss of no more than 70% when measured at 23.degree. C. with
a 10-mil notch in a 1/4-inch thick bar determined according to ASTM
D256 as compared to notched Izod impact strength for the same
polyester when measured at the same temperature with a 10-mil notch
in a 1/8-inch thick bar determined according to ASTM D256.
[0173] In one embodiment, the polyesters useful in the invention
and/or the polyester compositions of the invention, with or without
toners, can have color values L*, a* and b*, which can be
determined using a Hunter Lab Ultrascan Spectra Colorimeter
manufactured by Hunter Associates Lab Inc., Reston, Va. The color
determinations are averages of values measured on either pellets of
the polyesters or plaques or other items injection molded or
extruded from them They are determined by the L*a*b* color system
of the CIE (International Commission on Illumination) (translated),
wherein L* represents the lightness coordinate, a* represents the
red/green coordinate, and b* represents the yellow/blue coordinate.
In certain embodiments, the b* values for the polyesters useful in
the invention can be from -10 to less than 10 and the L* values can
be from 50 to 90. In other embodiments, the b* values for the
polyesters useful in the invention can be present in one of the
following ranges: -10 to 9; -10 to 8; -10 to 7; -10 to 6; -10 to 5;
-10 to 4; -10 to 3; -10 to 2; from -5 to 9; -5 to 8; -5 to 7; -5 to
6; -5 to 5; -5 to 4; -5 to 3; -5 to 2; 0 to 9; 0 to 8; 0 to 7; 0 to
6; 0 to 5; 0 to 4; 0 to 3; 0 to 2; 1 to 10; 1 to 9; 1 to 8; 1 to 7;
1 to 6; 1 to 5; 1 to 4; 1 to 3; and 1 to 2. In other embodiments,
the L* value for the polyesters useful in the invention can be
present in one of the following ranges: 50 to 60; 50 to 70; 50 to
80; 50 to 90; 60 to 70; 60 to 80; 60 to 90; 70 to 80; 79 to 90.
[0174] In one embodiment, the polyesters useful in the invention
exhibit a ductile-to-brittle transition temperature of less than
0.degree. C. based on a 10-mil notch in a 1/8-inch thick bar as
defined by ASTM D256.
[0175] In one embodiment, the polyesters useful in the invention
can exhibit at least one of the following densities: a density of
less than 1.3 g/ml at 23.degree. C.; a density of less than 1.2
g/ml at 23.degree. C.; a density of less than 1.18 g/ml at
23.degree. C.; a density of 0.80 to 1.3 g/ml at 23.degree. C.; a
density of 0.80 to 1.2 g/ml at 23.degree. C.; a density of 0.80 to
less than 1.2 g/ml at 23.degree. C.; a density of 1.0 to 1.3 g/ml
at 23.degree. C.; a density of 1.0 to 1.2 g/ml at 23.degree. C.; a
density of 1.0 to 1.1 g/ml at 23.degree. C.; a density of 1.13 to
1.3 g/ml at 23.degree. C.; a density of 1.13 to 1.2 g/ml at
23.degree. C.
[0176] In some embodiments, use of the polyester compositions
useful in the invention minimizes and/or eliminates the drying step
prior to melt processing and/or thermoforming.
[0177] The polyester portion of the polyester compositions useful
in the invention can be made by processes known from the literature
such as, for example, by processes in homogenous solution, by
transesterification processes in the melt, and by two phase
interfacial processes. Suitable methods include, but are not
limited to, the steps of reacting one or more dicarboxylic acids
with one or more glycols at a temperature of 100.degree. C. to
315.degree. C. at a pressure of 0.1 to 760 mm Hg for a time
sufficient to form a polyester. See U.S. Pat. No. 3,772,405 for
methods of producing polyesters, the disclosure regarding such
methods is hereby incorporated herein by reference.
[0178] In another aspect, the invention relates to ophthalmic
product(s) comprising a polyester produced by a process
comprising:
[0179] (I) heating a mixture comprising the monomers useful in any
of the polyesters in the invention in the presence of a catalyst at
a temperature of 150 to 240.degree. C. for a time sufficient to
produce an initial polyester;
[0180] (II) heating the initial polyester of step (I) at a
temperature of 240 to 320.degree. C. for 1 to 4 hours; and
[0181] (III) removing any unreacted glycols.
[0182] Suitable catalysts for use in this process include, but are
not limited to, organo-zinc or tin compounds. The use of this type
of catalyst is well known in the art. Examples of catalysts useful
in the present invention include, but are not limited to, zinc
acetate, butyltin tris-2-ethylhexanoate, dibutyltin diacetate, and
dibutyltin oxide. Other catalysts may include, but are not limited
to, those based on titanium, zinc, manganese, lithium, germanium,
and cobalt. Catalyst amounts can range from 10 ppm to 20,000 ppm or
10 to 10,000 ppm, or 10 to 5000 ppm or 10 to 1000 ppm or 10 to 500
ppm, or 10 to 300 ppm or 10 to 250 based on the catalyst metal and
based on the weight of the final polymer. The process can be
carried out in either a batch or continuous process.
[0183] Typically, step (I) can be carried out until 50% by weight
or more of the 2,2,4,4-tetramethyl-1,3-cyclobutanediol has been
reacted. Step (I) may be carried out under pressure, ranging from
atmospheric pressure to 100 psig. The term "reaction product" as
used in connection with any of the catalysts useful in the
invention refers to any product of a polycondensation or
esterification reaction with the catalyst and any of the monomers
used in making the polyester as well as the product of a
polycondensation or esterification reaction between the catalyst
and any other type of additive.
[0184] Typically, Step (II) and Step (III) can be conducted at the
same time. These steps can be carried out by methods known in the
art such as by placing the reaction mixture under a pressure
ranging from 0.002 psig to below atmospheric pressure, or by
blowing hot nitrogen gas over the mixture.
[0185] The invention further relates to a polyester product made by
the process described above.
[0186] The invention further relates to a polymer blend. The blend
comprises:
[0187] (a) 5 to 95 wt % of at least one of the polyesters described
above; and
[0188] (b) 5 to 95 wt % of at least one polymeric component.
[0189] Suitable examples of polymeric components include, but are
not limited to, nylon, polyesters different from those described
herein, polyamides such as ZYTEL.RTM. from DuPont; polystyrene,
polystyrene copolymers, styrene acrylonitrile copolymers,
acrylonitrile butadiene styrene copolymers,
poly(methylmethacrylate), acrylic copolymers, poly(ether-imides)
such as ULTEM.RTM. (a poly(ether-imide) from General Electric);
polyphenylene oxides such as poly(2,6-dimethylphenylene oxide) or
poly(phenylene oxide)/polystyrene blends such as NORYL 1000.RTM. (a
blend of poly(2,6-dimethylphenylene oxide) and polystyrene resins
from General Electric); polyphenylene sulfides; polyphenylene
sulfide/sulfones; poly(ester-carbonates); polycarbonates such as
LEXAN.RTM. (a polycarbonate from General Electric); polysulfones;
polysulfone ethers; and poly(ether-ketones) of aromatic dihydroxy
compounds; or mixtures of any of the other foregoing polymers. The
blends can be prepared by conventional processing techniques known
in the art, such as melt blending or solution blending. In one
embodiment, the polycarbonate is not present in the polyester
composition. If polycarbonate is used in a blend in the polyester
compositions useful in the invention, the blends can be visually
clear. However, the polyester compositions useful in the invention
also contemplate the exclusion of polycarbonate as well as the
inclusion of polycarbonate.
[0190] Polycarbonates useful in the invention may be prepared
according to known procedures, for example, by reacting the
dihydroxyaromatic compound with a carbonate precursor such as
phosgene, a haloformate or a carbonate ester, a molecular weight
regulator, an acid acceptor and a catalyst. Methods for preparing
polycarbonates are known in the art and are described, for example,
in U.S. Pat. No. 4,452,933, where the disclosure regarding the
preparation of polycarbonates is hereby incorporated by reference
herein.
[0191] Examples of suitable carbonate precursors include, but are
not limited to, carbonyl bromide, carbonyl chloride, or mixtures
thereof; diphenyl carbonate; a di(halophenyl)carbonate, e.g.,
di(trichlorophenyl)carbonate, di(tribromophenyl)carbonate, and the
like; di(alkylphenyl)carbonate, e.g., di(tolyl)carbonate;
di(naphthyl)carbonate; di(chloronaphthyl)carbonate, or mixtures
thereof; and bis-haloformates of dihydric phenols.
[0192] Examples of suitable molecular weight regulators include,
but are not limited to, phenol, cyclohexanol, methanol, alkylated
phenols, such as octylphenol, para-tertiary-butyl-phenol, and the
like. In one embodiment, the molecular weight regulator is phenol
or an alkylated phenol.
[0193] The acid acceptor may be either an organic or an inorganic
acid acceptor. A suitable organic acid acceptor can be a tertiary
amine and includes, but is not limited to, such materials as
pyridine, triethylamine, dimethylaniline, tributylamine, and the
like. The inorganic acid acceptor can be either a hydroxide, a
carbonate, a bicarbonate, or a phosphate of an alkali or alkaline
earth metal.
[0194] The catalysts that can be used include, but are not limited
to, those that typically aid the polymerization of the monomer with
phosgene. Suitable catalysts include, but are not limited to,
tertiary amines such as triethylamine, tripropylamine,
N,N-dimethylaniline, quaternary ammonium compounds such as, for
example, tetraethylammonium bromide, cetyl triethyl ammonium
bromide, tetra-n-heptylammonium iodide, tetra-n-propyl ammonium
bromide, tetramethyl ammonium chloride, tetra-methyl ammonium
hydroxide, tetra-n-butyl ammonium iodide, benzyltrimethyl ammonium
chloride and quaternary phosphonium compounds such as, for example,
n-butyltriphenyl phosphonium bromide and methyltriphenyl
phosphonium bromide.
[0195] The polycarbonates useful in the polyester compositions of
the invention also may be copolyestercarbonates such as those
described in U.S. Pat. Nos. 3,169,121; 3,207,814; 4,194,038;
4,156,069; 4,430,484, 4,465,820, and 4,981,898, the disclosure
regarding copolyestercarbonates from each of the U.S. patents is
incorporated by reference herein.
[0196] Copolyestercarbonates useful in this invention can be
available commercially and/or can be prepared by known methods in
the art. For example, they can be typically obtained by the
reaction of at least one dihydroxyaromatic compound with a mixture
of phosgene and at least one dicarboxylic acid chloride, especially
isophthaloyl chloride, terephthaloyl chloride, or both.
[0197] In addition, the polyester compositions and the polymer
blend compositions useful in the ophthalmic product(s) of this
invention may also contain from 0.01 to 25% by weight of the
overall composition common additives such as colorants, dyes, mold
release agents, flame retardants, plasticizers, nucleating agents,
stabilizers, including but not limited to, UV stabilizers, thermal
stabilizers and/or reaction products thereof, fillers, and impact
modifiers. For example, UV additives can be incorporated into the
ophthalmic product(s) through addition to the bulk, through
application of a hard coat, or through the coextrusion of a cap
layer. Examples of typical commercially available impact modifiers
well known in the art and useful in this invention include, but are
not limited to, ethylene/propylene terpolymers; functionalized
polyolefins,such as those containing methyl acrylate and/or
glycidyl methacrylate; styrene-based block copolymeric impact
modifiers, and various acrylic core/shell type impact modifiers.
Residues of such additives are also contemplated as part of the
polyester composition.
[0198] The polyesters of the invention can comprise at least one
chain extender. Suitable chain extenders include, but are not
limited to, multifunctional (including, but not limited to,
bifunctional) isocyanates, multifunctional epoxides, including for
example, epoxylated novolacs, and phenoxy resins. In certain
embodiments, chain extenders may be added at the end of the
polymerization process or after the polymerization process. If
added after the polymerization process, chain extenders can be
incorporated by compounding or by addition during conversion
processes such as injection molding or extrusion. The amount of
chain extender used can vary depending on the specific monomer
composition used and the physical properties desired but is
generally from 0.1 percent by weight to 10 percent by weight, such
as from 0.1 to 5 percent by weight, based on the total weigh of the
polyester.
[0199] Thermal stabilizers are compounds that stabilize polyesters
during polyester manufacture and/or post polymerization, including,
but not limited to, phosphorous compounds, including, but not
limited to, phosphoric acid, phosphorous acid, phosphonic acid,
phosphinic acid, phosphonous acid, and various esters and salts
thereof. The esters can be alkyl, branched alkyl, substituted
alkyl, difunctional alkyl, alkyl ethers, aryl, and substituted
aryl. In one embodiment, the number of ester groups present in the
particular phosphorous compound can vary from zero up to the
maximum allowable based on the number of hydroxyl groups present on
the thermal stabilizer used. The term "thermal stabilizer" is
intended to include the reaction product(s) thereof. The term
"reaction product" as used in connection with the thermal
stabilizers of the invention refers to any product of a
polycondensation or esterification reaction between the thermal
stabilizer and any of the monomers used in making the polyester as
well as the product of a polycondensation or esterification
reaction between the catalyst and any other type of additive. These
can be present in the polyester compositions useful in the
invention.
[0200] Reinforcing materials may be useful in the compositions of
this invention. The reinforcing materials may include, but are not
limited to, carbon filaments, silicates, mica, clay, talc, titanium
dioxide, Wollastonite, glass flakes, glass beads and fibers, and
polymeric fibers and combinations thereof. In one embodiment, the
reinforcing materials are glass, such as, fibrous glass filaments,
mixtures of glass and talc, glass and mica, and glass and polymeric
fibers.
[0201] The invention further relates to ophthalmic products
described herein. These ophthalmic products include, but are not
limited to, injection molded ophthalmic products, compression
molded ophthalmic products, and solution casted ophthalmic
products. Methods of making ophthalmic products include, but are
not limited to, injection molding, compression molding, and
solution casting.
[0202] For the purposes of this disclosure, the term "wt" means
"weight".
[0203] The following examples further illustrate how the ophthalmic
product(s) of the invention can be made and evaluated, and are
intended to be purely exemplary of the invention and are not
intended to limit the scope thereof. Unless indicated otherwise,
parts are parts by weight, temperature is in degrees C or is at
room temperature, and pressure is at or near atmospheric.
EXAMPLES
Measurement Methods
[0204] The inherent viscosity of the polyesters was determined in
60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.5
g/100 ml at 25.degree. C.
[0205] Unless stated otherwise, the glass transition temperature
(T.sub.g) was determined using a TA DSC 2920 instrument from
Thermal Analyst Instruments at a scan rate of 20.degree. C./min
according to ASTM D3418.
[0206] The glycol content and the cis/trans ratio of the
compositions were determined by proton nuclear magnetic resonance
(NMR) spectroscopy. All NMR spectra were recorded on a JEOL Eclipse
Plus 600 MHz nuclear magnetic resonance spectrometer using either
chloroform-trifluoroacetic acid (70-30 volume/volume) for polymers
or, for oligomeric samples, 60/40(wt/wt) phenol/tetrachloroethane
with deuterated chloroform added for lock. Peak assignments for
2,2,4,4-tetramethyl-1,3-cyclobutanediol resonances were made by
comparison to model mono- and dibenzoate esters of
2,2,4,4-tetramethyl-1,3-cyclobutanediol. These model compounds
closely approximate the resonance positions found in the polymers
and oligomers.
[0207] The crystallization half-time, t1/2, was determined by
measuring the light transmission of a sample via a laser and photo
detector as a function of time on a temperature controlled hot
stage. This measurement was done by exposing the polymers to a
temperature, T.sub.max, and then cooling it to the desired
temperature. The sample was then held at the desired temperature by
a hot stage while transmission measurements were made as a function
of time. Initially, the sample was visually clear with high light
transmission and became opaque as the sample crystallized. The
crystallization half-time was recorded as the time at which the
light transmission was halfway between the initial transmission and
the final transmission. T.sub.max is defined as the temperature
required to melt the crystalline domains of the sample (if
crystalline domains are present). The T.sub.max reported in the
examples below represents the temperature at which each sample was
heated to condition the sample prior to crystallization half time
measurement. The T.sub.max temperature is dependant on composition
and is typically different for each polyester. For example, PCT may
need to be heated to some temperature greater than 290.degree. C.
to melt the crystalline domains.
[0208] Density was determined using a gradient density column at
23.degree. C.
[0209] The melt viscosity reported herein was measured by using a
Rheometrics Dynamic Analyzer (RDA II). The melt viscosity was
measured as a function of shear rate, at frequencies ranging from 1
to 400 rad/sec, at the temperatures reported. The zero shear melt
viscosity (.eta..sub.o) is the melt viscosity at zero shear rate
estimated by extrapolating the data by known models in the art.
This step is automatically performed by the Rheometrics Dynamic
Analyzer (RDA II) software.
[0210] The polymers were dried at a temperature ranging from 80 to
100.degree. C. in a vacuum oven for 24 hours and injection molded
on a Boy 22S molding machine to give 1/8.times.1/2.times.5-inch and
1/4.times.1/2.times.5-inch flexure bars. These bars were cut to a
length of 2.5 inch and notched down the 1/2 inch width with a
10-mil notch in accordance with ASTM D256. The average Izod impact
strength at 23.degree. C. was determined from measurements on 5
specimens.
[0211] In addition, 5 specimens were tested at various temperatures
using 5.degree. C. increments in order to determine the
brittle-to-ductile transition temperature. The brittle-to-ductile
transition temperature is defined as the temperature at which 50%
of the specimens fail in a brittle manner as denoted by ASTM
D256.
[0212] Color values reported herein were determined using a Hunter
Lab Ultrascan Spectra Colorimeter manufactured by Hunter Associates
Lab Inc., Reston, Va. The color determinations were averages of
values measured on either pellets of the polyesters or plaques or
other items injection molded or extruded from them. They were
determined by the L*a*b* color system of the CIE (International
Commission on Illumination) (translated), wherein L* represents the
lightness coordinate, a* represents the red/green coordinate, and
b* represents the yellow/blue coordinate.
[0213] In addition, 10-mil films were compression molded using a
Carver press at 240.degree. C.
[0214] Unless otherwise specified, the cis/trans ratio of the 1,4
cyclohexanedimethanol used in the following examples was
approximately 30/70, and could range from 35/65 to 25/75. Unless
otherwise specified, the cis/trans ratio of the
2,2,4,4-tetramethyl-1,3-cyclobutanediol used in the following
examples was approximately 50/50.
[0215] The following abbreviations apply throughout the working
examples and figures: TABLE-US-00001 TPA Terephthalic acid DMT
Dimethyl terephthalate TMCD 2,2,4,4-tetramethyl-1,3-cyclobutanediol
CHDM 1,4-cyclohexanedimethanol IV Inherent viscosity .eta..sub.0
Zero shear melt viscosity T.sub.g Glass transition temperature
T.sub.bd Brittle-to-ductile transition temperature T.sub.max
Conditioning temperature for crystallization half time
measurements
Example 1
[0216] This example illustrates that
2,2,4,4-tetramethyl-1,3-cyclobutanediol is more effective at
reducing the crystallization rate of PCT than ethylene glycol or
isophthalic acid. In addition, this example illustrates the
benefits of 2,2,4,4-tetramethyl-1,3-cyclobutanediol on the glass
transition temperature and density.
[0217] A variety of copolyesters were prepared as described below.
These copolyesters were all made with 200 ppm dibutyl tin oxide as
the catalyst in order to minimize the effect of catalyst type and
concentration on nucleation during crystallization studies. The
cis/trans ratio of the 1,4-cyclohexanedimethanol was 31/69 while
the cis/trans ratio of the 2,2,4,4-tetramethyl-1,3-cyclobutanediol
is reported in Table 1.
[0218] For purposes of this example, the samples had sufficiently
similar inherent viscosities thereby effectively eliminating this
as a variable in the crystallization rate measurements.
[0219] Crystallization half-time measurements from the melt were
made at temperatures from 140 to 200.degree. C. at 10.degree. C.
increments and are reported in Table 1. The fastest crystallization
half-time for each sample was taken as the minimum value of
crystallization half-time as a function of temperature, typically
occurring around 170 to 180.degree. C. The fastest crystallization
half-times for the samples are plotted in FIG. 1 as a function of
mole % comonomer modification to PCT.
[0220] The data shows that 2,2,4,4-tetramethyl-1,3-cyclobutanediol
is more effective than ethylene glycol and isophthalic acid at
decreasing the crystallization rate (i.e., increasing the
crystallization half-time). In addition,
2,2,4,4-tetramethyl-1,3-cyclobutanediol increases T.sub.g and
lowers density. TABLE-US-00002 TABLE 1 Crystallization Half-times
(min) at at at at at at at Comonomer IV Density T.sub.g T.sub.max
140.degree. C. 150.degree. C. 160.degree. C. 170.degree. C.
180.degree. C. 190.degree. C. 200.degree. C. Example (mol %).sup.1
(dl/g) (g/ml) (.degree. C.) (.degree. C.) (min) (min) (min) (min)
(min) (min) (min) 1A 20.2% A.sup.2 0.630 1.198 87.5 290 2.7 2.1 1.3
1.2 0.9 1.1 1.5 1B 19.8% B 0.713 1.219 87.7 290 2.3 2.5 1.7 1.4 1.3
1.4 1.7 1C 20.0% C 0.731 1.188 100.5 290 >180 >60 35.0 23.3
21.7 23.3 25.2 1D 40.2% A.sup.2 0.674 1.198 81.2 260 18.7 20.0 21.3
25.0 34.0 59.9 96.1 1E 34.5% B 0.644 1.234 82.1 260 8.5 8.2 7.3 7.3
8.3 10.0 11.4 1F 40.1% C 0.653 1.172 122.0 260 >10 days >5
days >5 days 19204 >5 days >5 days >5 days 1G 14.3% D
0.646.sup.3 1.188 103.0 290 55.0 28.8 11.6 6.8 4.8 5.0 5.5 1H 15.0%
E 0.728.sup.4 1.189 99.0 290 25.4 17.1 8.1 5.9 4.3 2.7 5.1
.sup.1The balance of the diol component of the polyesters in Table
1 is 1,4-cyclohexanedimethanol; and the balance of the dicarboxylic
acid component of the polyesters in Table 1 is dimethyl
terephthalate; if the dicarboxylic acid is not described, it is 100
mole % dimethyl terephthalate. .sup.2100 mole %
1,4-cyclohexanedimethanol. .sup.3A film was pressed from the ground
polyester of Example 1G at 240.degree. C. The resulting film had an
inherent viscosity value of 0.575 dL/g. .sup.4A film was pressed
from the ground polyester of Example 1H at 240.degree. C. The
resulting film had an inherent viscosity value of 0.0.652 dL/g.
where: A is Isophthalic Acid B is Ethylene Glycol C is
2,2,4,4-Tetramethyl-1,3-cyclobutanediol (approx. 50/50 cis/trans) D
is 2,2,4,4-Tetramethyl-1,3-cyclobutanediol (98/2 cis/trans) E is
2,2,4,4-Tetramethyl-1,3-cyclobutanediol (5/95 cis/trans)
[0221] As shown in Table 1 and FIG. 1,
2,2,4,4-tetramethyl-1,3-cyclobutanediol is more effective than
other comonomers, such ethylene glycol and isophthalic acid, at
increasing the crystallization half-time, i.e., the time required
for a polymer to reach half of its maximum crystallinity. By
decreasing the crystallization rate of PCT (increasing the
crystallization half-time), amorphous articles based on
2,2,4,4-tetramethyl-1,3-cyclobutanediol-modified PCT as described
herein may be fabricated by methods known in the art. As shown in
Table 1, these materials can exhibit higher glass transition
temperatures and lower densities than other modified PCT
copolyesters.
[0222] Preparation of the polyesters shown on Table 1 is described
below.
Example 1A
[0223] This example illustrates the preparation of a copolyester
with a target composition of 80 mol % dimethyl terephthalate
residues, 20 mol % dimethyl isophthalate residues, and 100 mol %
1,4-cyclohexanedimethanol residues (28/72 cis/trans).
[0224] A mixture of 56.63 g of dimethyl terephthalate, 55.2 g of
1,4-cyclohexanedimethanol, 14.16 g of dimethyl isophthalate, and
0.0419 g of dibutyl tin oxide was placed in a 500-milliliter flask
equipped with an inlet for nitrogen, a metal stirrer, and a short
distillation column. The flask was placed in a Wood's metal bath
already heated to 210.degree. C. The stirring speed was set to 200
RPM throughout the experiment. The contents of the flask were
heated at 210.degree. C. for 5 minutes and then the temperature was
gradually increased to 290.degree. C. over 30 minutes. The reaction
mixture was held at 290.degree. C. for 60 minutes and then vacuum
was gradually applied over the next 5 minutes until the pressure
inside the flask reached 100 mm of Hg. The pressure inside the
flask was further reduced to 0.3 mm of Hg over the next 5 minutes.
A pressure of 0.3 mm of Hg was maintained for a total time of 90
minutes to remove excess unreacted diols. A high melt viscosity,
visually clear and colorless polymer was obtained with a glass
transition temperature of 87.5.degree. C. and an inherent viscosity
of 0.63 dl/g. NMR analysis showed that the polymer was composed of
100 mol % 1,4-cyclohexanedimethanol residues and 20.2 mol %
dimethyl isophthalate residues.
Example 1B
[0225] This example illustrates the preparation of a copolyester
with a target composition of 100 mol % dimethyl terephthalate
residues, 20 mol % ethylene glycol residues, and 80 mol %
1,4-cyclohexanedimethanol residues (32/68 cis/trans).
[0226] A mixture of 77.68 g of dimethyl terephthalate, 50.77 g of
1,4-cyclohexanedimethanol, 27.81 g of ethylene glycol, and 0.0433 g
of dibutyl tin oxide was placed in a 500-milliliter flask equipped
with an inlet for nitrogen, a metal stirrer, and a short
distillation column. The flask was placed in a Wood's metal bath
already heated to 200.degree. C. The stirring speed was set to 200
RPM throughout the experiment. The contents of the flask were
heated at 200.degree. C. for 60 minutes and then the temperature
was gradually increased to 210.degree. C. over 5 minutes. The
reaction mixture was held at 210.degree. C. for 120 minutes and
then heated up to 280.degree. C. in 30 minutes. Once at 280.degree.
C., vacuum was gradually applied over the next 5 minutes until the
pressure inside the flask reached 100 mm of Hg. The pressure inside
the flask was further reduced to 0.3 mm of Hg over the next 10
minutes. A pressure of 0.3 mm of Hg was maintained for a total time
of 90 minutes to remove excess unreacted diols. A high melt
viscosity, visually clear and colorless polymer was obtained with a
glass transition temperature of 87.7.degree. C. and an inherent
viscosity of 0.71 dl/g. NMR analysis showed that the polymer was
composed of 19.8 mol % ethylene glycol residues.
Example 1C
[0227] This example illustrates the preparation of a copolyester
with a target composition of 100 mol % dimethyl terephthalate
residues, 20 mol % 2,2,4,4-tetramethyl-1,3-cyclobutanediol
residues, and 80 mol % 1,4-cyclohexanedimethanol residues (31/69
cis/trans).
[0228] A mixture of 77.68 g of dimethyl terephthalate, 48.46 g of
1,4-cyclohexanedimethanol, 17.86 g of
2,2,4,4-tetramethyl-1,3-cyclobutanediol, and 0.046 g of dibutyl tin
oxide was placed in a 500-milliliter flask equipped with an inlet
for nitrogen, a metal stirrer, and a short distillation column.
This polyester was prepared in a manner similar to that described
in Example 1A. A high melt viscosity, visually clear and colorless
polymer was obtained with a glass transition temperature of
100.5.degree. C. and an inherent viscosity of 0.73 dl/g. NMR
analysis showed that the polymer was composed of 80.5 mol %
1,4-cyclohexanedimethanol residues and 19.5 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues.
Example 1D
[0229] This example illustrates the preparation of a copolyester
with a target composition of 100 mol % dimethyl terephthalate
residues, 40 mol % dimethyl isophthalate residues, and 100 mol %
1,4-cyclohexanedimethanol residues (28/72 cis/trans).
[0230] A mixture of 42.83 g of dimethyl terephthalate, 55.26 g of
1,4-cyclohexanedimethanol, 28.45 g of dimethyl isophthalate, and
0.0419 g of dibutyl tin oxide was placed in a 500-milliliter flask
equipped with an inlet for nitrogen, a metal stirrer, and a short
distillation column. The flask was placed in a Wood's metal bath
already heated to 210.degree. C. The stirring speed was set to 200
RPM throughout the experiment. The contents of the flask were
heated at 210.degree. C. for 5 minutes and then the temperature was
gradually increased to 290.degree. C. over 30 minutes. The reaction
mixture was held at 290.degree. C. for 60 minutes and then vacuum
was gradually applied over the next 5 minutes until the pressure
inside the flask reached 100 mm of Hg. The pressure inside the
flask was further reduced to 0.3 mm of Hg over the next 5 minutes.
A pressure of 0.3 mm of Hg was maintained for a total time of 90
minutes to remove excess unreacted diols. A high melt viscosity,
visually clear and colorless polymer was obtained with a glass
transition temperature of 81.2.degree. C. and an inherent viscosity
of 0.67 dl/g. NMR analysis showed that the polymer was composed of
100 mol % 1,4-cyclohexanedimethanol residues and 40.2 mol %
dimethyl isophthalate residues.
Example 1E
[0231] This example illustrates the preparation of a copolyester
with a target composition of 100 mol % dimethyl terephthalate
residues, 40 mol % ethylene glycol residues, and 60 mol %
1,4-cyclohexanedimethanol residues (31/69 cis/trans).
[0232] A mixture of 81.3 g of dimethyl terephthalate, 42.85 g of
1,4-cyclohexanedimethanol, 34.44 g of ethylene glycol, and 0.0419 g
of dibutyl tin oxide was placed in a 500-milliliter flask equipped
with an inlet for nitrogen, a metal stirrer, and a short
distillation column. The flask was placed in a Wood's metal bath
already heated to 200.degree. C. The stirring speed was set to 200
RPM throughout the experiment. The contents of the flask were
heated at 200.degree. C. for 60 minutes and then the temperature
was gradually increased to 210.degree. C. over 5 minutes. The
reaction mixture was held at 210.degree. C. for 120 minutes and
then heated up to 280.degree. C. in 30 minutes. Once at 280.degree.
C., vacuum was gradually applied over the next 5 minutes until the
pressure inside the flask reached 100 mm of Hg. The pressure inside
the flask was further reduced to 0.3 mm of Hg over the next 10
minutes. A pressure of 0.3 mm of Hg was maintained for a total time
of 90 minutes to remove excess unreacted diols. A high melt
viscosity, visually clear and colorless polymer was obtained with a
glass transition temperature of 82.1.degree. C. and an inherent
viscosity of 0.64 dl/g. NMR analysis showed that the polymer was
composed of 34.5 mol % ethylene glycol residues.
Example 1F
[0233] This example illustrates the preparation of a copolyester
with a target composition of 100 mol % dimethyl terephthalate
residues, 40 mol % 2,2,4,4-tetramethyl-1,3-cyclobutanediol
residues, and 60 mol % 1,4-cyclohexanedimethanol residues (31/69
cis/trans).
[0234] A mixture of 77.4 g of dimethyl terephthalate, 36.9 g of
1,4-cyclohexanedimethanol, 32.5 g of
2,2,4,4-tetramethyl-1,3-cyclobutanediol, and 0.046 g of dibutyl tin
oxide was placed in a 500-milliliter flask equipped with an inlet
for nitrogen, a metal stirrer, and a short distillation column. The
flask was placed in a Wood's metal bath already heated to
210.degree. C. The stirring speed was set to 200 RPM throughout the
experiment. The contents of the flask were heated at 210.degree. C.
for 3 minutes and then the temperature was gradually increased to
260.degree. C. over 30 minutes. The reaction mixture was held at
260.degree. C. for 120 minutes and then heated up to 290.degree. C.
in 30 minutes. Once at 290.degree. C., vacuum was gradually applied
over the next 5 minutes until the pressure inside the flask reached
100 mm of Hg. The pressure inside the flask was further reduced to
0.3 mm of Hg over the next 5 minutes. A pressure of 0.3 mm of Hg
was maintained for a total time of 90 minutes to remove excess
unreacted diols. A high melt viscosity, visually clear and
colorless polymer was obtained with a glass transition temperature
of 122.degree. C. and an inherent viscosity of 0.65 dl/g. NMR
analysis showed that the polymer was composed of 59.9 mol %
1,4-cyclohexanedimethanol residues and 40.1 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues.
Example 1G
[0235] This example illustrates the preparation of a copolyester
with a target composition of 100 mol % dimethyl terephthalate
residues, 20 mol % 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues
(98/2 cis/trans), and 80 mol % 1,4-cyclohexanedimethanol residues
(31/69 cis/trans).
[0236] A mixture of 77.68 g of dimethyl terephthalate, 48.46 g of
1,4-cyclohexanedimethanol, 20.77 g of
2,2,4,4-tetramethyl-1,3-cyclobutanediol, and 0.046 g of dibutyl tin
oxide was placed in a 500-milliliter flask equipped with an inlet
for nitrogen, a metal stirrer, and a short distillation column. The
flask was placed in a Wood's metal bath already heated to
210.degree. C. The stirring speed was set to 200 RPM throughout the
experiment. The contents of the flask were heated at 210.degree. C.
for 3 minutes and then the temperature was gradually increased to
260.degree. C. over 30 minutes. The reaction mixture was held at
260.degree. C. for 120 minutes and then heated up to 290.degree. C.
in 30 minutes. Once at 290.degree. C., vacuum was gradually applied
over the next 5 minutes until the pressure inside the flask reached
100 mm of Hg and the stirring speed was also reduced to 100 RPM.
The pressure inside the flask was further reduced to 0.3 mm of Hg
over the next 5 minutes and the stirring speed was reduced to 50
RPM. A pressure of 0.3 mm of Hg was maintained for a total time of
60 minutes to remove excess unreacted diols. A high melt viscosity,
visually clear and colorless polymer was obtained with a glass
transition temperature of 103.degree. C. and an inherent viscosity
of 0.65 dl/g. NMR analysis showed that the polymer was composed of
85.7 mol % 1,4-cyclohexanedimethanol residues and 14.3 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues.
Example 1H
[0237] This example illustrates the preparation of a copolyester
with a target composition of 100 mol % dimethyl terephthalate
residues, 20 mol % 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues
(5/95 cis/trans), and 80 mol % 1,4-cyclohexanedimethanol residues
(31/69 cis/trans).
[0238] A mixture of 77.68 g of dimethyl terephthalate, 48.46 g of
1,4-cyclohexanedimethanol, 20.77 g of
2,2,4,4-tetramethyl-1,3-cyclobutanediol, and 0.046 g of dibutyl tin
oxide was placed in a 500-milliliter flask equipped with an inlet
for nitrogen, a metal stirrer, and a short distillation column. The
flask was placed in a Wood's metal bath already heated to
210.degree. C. The stirring speed was set to 200 RPM at the
beginning of the experiment. The contents of the flask were heated
at 210.degree. C. for 3 minutes and then the temperature was
gradually increased to 260.degree. C. over 30 minutes. The reaction
mixture was held at 260.degree. C. for 120 minutes and then heated
up to 290.degree. C. in 30 minutes. Once at 290.degree. C., vacuum
was gradually applied over the next 5 minutes with a set point of
100 mm of Hg and the stirring speed was also reduced to 100 RPM.
The pressure inside the flask was further reduced to a set point of
0.3 mm of Hg over the next 5 minutes and the stirring speed was
reduced to 50 RPM. This pressure was maintained for a total time of
60 minutes to remove excess unreacted diols. It was noted that the
vacuum system failed to reach the set point mentioned above, but
produced enough vacuum to produce a high melt viscosity, visually
clear and colorless polymer with a glass transition temperature of
99.degree. C. and an inherent viscosity of 0.73 dl/g. NMR analysis
showed that the polymer was composed of 85 mol %
1,4-cyclohexanedimethanol residues and 15 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues.
Example 2
[0239] This example illustrates that
2,2,4,4-tetramethyl-1,3-cyclobutanediol improves the toughness of
PCT-based copolyesters (polyesters containing terephthalic acid and
1,4-cyclohexanedimethanol).
[0240] Copolyesters based on
2,2,4,4-tetramethyl-1,3-cyclobutanediol were prepared as described
below. The cis/trans ratio of the 1,4-cyclohexanedimethanol was
approximately 31/69 for all samples. Copolyesters based on ethylene
glycol and 1,4-cyclohexanedimethanol were commercial polyesters.
The copolyester of Example 2A (Eastar PCTG 5445) was obtained from
Eastman Chemical Co. The copolyester of Example 2B was obtained
from Eastman Chemical Co. under the trade name Spectar. Example 2C
and Example 2D were prepared on a pilot plant scale (each a 15-lb
batch) following an adaptation of the procedure described in
Example 1A and having the inherent viscosities and glass transition
temperatures described in Table 2 below. Example 2C was prepared
with a target tin amount of 300 ppm (Dibutyltin Oxide). The final
product contained 295 ppm tin. The color values for the polyester
of Example 2C were L*=77.11; a*=-1.50; and b*=5.79. Example 2D was
prepared with a target tin amount of 300 ppm (Dibutyltin Oxide).
The final product contained 307 ppm tin. The color values for the
polyester of Example 2D were L*=66.72; a*=-1.22; and b*=16.28.
[0241] Materials were injection molded into bars and subsequently
notched for Izod testing. The notched Izod impact strengths were
obtained as a function of temperature and are also reported in
Table 2.
[0242] For a given sample, the Izod impact strength undergoes a
major transition in a short temperature span. For instance, the
Izod impact strength of a copolyester based on 38 mol % ethylene
glycol undergoes this transition between 15 and 20.degree. C. This
transition temperature is associated with a change in failure mode;
brittle/low energy failures at lower temperatures and ductile/high
energy failures at higher temperatures. The transition temperature
is denoted as the brittle-to-ductile transition temperature,
T.sub.bd, and is a measure of toughness. T.sub.bd is reported in
Table 2 and plotted against mol % comonomer in FIG. 2.
[0243] The data shows that adding
2,2,4,4-tetramethyl-1,3-cyclobutanediol to PCT lowers T.sub.bd and
improves the toughness, as compared to ethylene glycol, which
increases T.sub.bd of PCT. TABLE-US-00003 TABLE 2 Notched Izod
Impact Energy (ft-lb/in) Comonomer IV (dl/ T.sub.g T.sub.bd at at
at at at at at at at at at Example (mol %).sup.1 g) (.degree. C.)
(.degree. C.) -20.degree. C. -15.degree. C. -10.degree. C.
-5.degree. C. 0.degree. C. 5.degree. C. 10.degree. C. 15.degree. C.
20.degree. C. 25.degree. C. 30.degree. C. 2A 38.0% B 0.68 86 18 NA
NA NA 1.5 NA NA 1.5 1.5 32 32 NA 2B 69.0% B 0.69 82 26 NA NA NA NA
NA NA 2.1 NA 2.4 13.7 28.7 2C 22.0% C 0.66 106 -5 1.5 NA 12 23 23
NA 23 NA NA NA NA 2D 42.8% C 0.60 133 -12 2.5 2.5 11 NA 14 NA NA NA
NA NA NA .sup.1The balance of the glycol component of the
polyesters in the Table is 1,4-cyclohexanedimethanol. All polymers
were prepared from 100 mole % dimethyl terephthalate. NA = Not
available. where: B is Ethylene glycol C is
2,2,4,4-Tetramethyl-1,3-cyclobutanediol (50/50 cis/trans)
Example 3
[0244] This example illustrates that
2,2,4,4-tetramethyl-1,3-cyclobutanediol can improve the toughness
of PCT-based copolyesters(polyesters containing terephthalic acid
and 1,4-cyclohexanedimethanol). Polyesters prepared in this example
comprise from 15 to 25 mol % of
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues.
[0245] Copolyesters based on dimethyl terephthalate,
2,2,4,4-tetramethyl-1,3-cyclobutanediol, and
1,4-cyclohexanedimethanol were prepared as described below, having
the composition and properties shown on Table 3. The balance up to
100 mol % of the diol component of the polyesters in Table 3 was
1,4-cyclohexanedimethanol (31/69 cis/trans).
[0246] Materials were injection molded into both 3.2 mm and 6.4 mm
thick bars and subsequently notched for Izod impact testing. The
notched Izod impact strengths were obtained at 23.degree. C. and
are reported in Table 3. Density, Tg, and crystallization halftime
were measured on the molded bars. Melt viscosity was measured on
pellets at 290.degree. C. TABLE-US-00004 TABLE 3 Compilation of
various properties for certain polyesters useful in the invention
Notched Notched Izod of Izod of 3.2 mm 6.4 mm Melt thick thick
Crystallization Viscosity Pellet Molded bars at bars at Specific
Halftime from at 1 rad/sec TMCD % cis IV Bar IV 23.degree. C.
23.degree. C. Gravity Tg melt at 170.degree. C. at 290.degree. C.
Example mole % TMCD (dl/g) (dl/g) (J/m) (J/m) (g/mL) (.degree. C.)
(min) (Poise) A 15 48.8 0.736 0.707 1069 878 1.184 104 15 5649 B 18
NA 0.728 0.715 980 1039 1.183 108 22 6621 C 20 NA 0.706 0.696 1006
1130 1.182 106 52 6321 D 22 NA 0.732 0.703 959 988 1.178 108 63
7161 E 21 NA 0.715 0.692 932 482 1.179 110 56 6162 F 24 NA 0.708
0.677 976 812 1.180 109 58 6282 G 23 NA 0.650 0.610 647 270 1.182
107 46 3172 H 23 47.9 0.590 0.549 769 274 1.181 106 47 1736 I 23
48.1 0.531 0.516 696 352 1.182 105 19 1292 NA = Not available
Example 3A
[0247] 21.24 lb (49.71 gram-mol) dimethyl terephthalate, 14.34 lb
(45.21 gram-mol) 1,4-cyclohexanedimethanol, and 4.58 lb (14.44
gram-mol) 2,2,4,4-tetramethyl-1,3-cyclobutanediol were reacted
together in the presence of 200 ppm of the catalyst butyltin
tris(2-ethylhexanoate). The reaction was carried out under a
nitrogen gas purge in an 18-gallon stainless steel pressure vessel
fitted with a condensing column, a vacuum system, and a
HELICONE-type agitator. With the agitator running at 25 RPM, the
reaction mixture temperature was increased to 250.degree. C. and
the pressure was increased to 20 psig. The reaction mixture was
held for 2 hours at 250.degree. C. and at a pressure of 20 psig.
The pressure was then decreased to 0 psig at a rate of 3
psig/minute. The temperature of the reaction mixture was then
increased to 270.degree. C. and the pressure was decreased to 90 mm
of Hg. After a 1 hour hold time at 270.degree. C. and 90 mm of Hg,
the agitator speed was decreased to 15 RPM, the reaction mixture
temperature was increased to 290.degree. C., and the pressure was
decreased to <1 mm of Hg. The reaction mixture was held at
290.degree. C. and at a pressure of <1 mm of Hg until the power
draw to the agitator no longer increased (70 minutes). The pressure
of the pressure vessel was then increased to 1 atmosphere using
nitrogen gas. The molten polymer was then extruded from the
pressure vessel. The cooled, extruded polymer was ground to pass a
6-mm screen. The polymer had an inherent viscosity of 0.736 dL/g
and a Tg of 104.degree. C. NMR analysis showed that the polymer was
composed of 85.4 mol % 1,4-cyclohexanedimethanol residues and 14.6
mol % 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues. The polymer
had color values of: L*=78.20, a*=-1.62, and b*=6.23.
Example 3B to Example 3D
[0248] The polyesters described in Example 3B to Example 3D were
prepared following a procedure similar to the one described for
Example 3A. The composition and properties of these polyesters are
shown in Table 3.
Example 3E
[0249] 21.24 lb (49.71 gram-mol) dimethyl terephthalate, 12.61 lb
(39.77 gram-mol) 1,4-cyclohexanedimethanol, and 6.30 lb (19.88
gram-mol) 2,2,4,4-tetramethyl-1,3-cyclobutanediol were reacted
together in the presence of 200 ppm of the catalyst butyltin
tris(2-ethylhexanoate). The reaction was carried out under a
nitrogen gas purge in an 18-gallon stainless steel pressure vessel
fitted with a condensing column, a vacuum system, and a
HELICONE-type agitator. With the agitator running at 25 RPM, the
reaction mixture temperature was increased to 250.degree. C. and
the pressure was increased to 20 psig. The reaction mixture was
held for 2 hours at 250.degree. C. and 20 psig pressure. The
pressure was then decreased to 0 psig at a rate of 3 psig/minute.
The temperature of the reaction mixture was then increased to
270.degree. C. and the pressure was decreased to 90 mm of Hg. After
a 1 hour hold time at 270.degree. C. and 90 mm of Hg, the agitator
speed was decreased to 15 RPM, the reaction mixture temperature was
increased to 290.degree. C., and the pressure was decreased to
<1 mm of Hg. The reaction mixture was held at 290.degree. C. and
at a pressure of <1 mm of Hg for 60 minutes. The pressure of the
pressure vessel was then increased to 1 atmosphere using nitrogen
gas. The molten polymer was then extruded from the pressure vessel.
The cooled, extruded polymer was ground to pass a 6-mm screen. The
polymer had an inherent viscosity of 0.715 dL/g and a Tg of
110.degree. C. X-ray analysis showed that the polyester had 223 ppm
tin. NMR analysis showed that the polymer was composed of 78.6 mol
% 1,4-cyclohexanedimethanol residues and 21.4 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues. The polymer had
color values of: L*=76.45, a*=-1.65, and b*=6.47.
Example 3F
[0250] The polyester described in Example 3F was prepared following
a procedure similar to the one described for Example 3A. The
composition and properties of this polyester are shown in Table
3.
Example 3H
[0251] 21.24 lb (49.71 gram-mol) dimethyl terephthalate, 12.61 lb
(39.77 gram-mol) 1,4-cyclohexanedimethanol, and 6.30 lb (19.88
gram-mol) 2,2,4,4-tetramethyl-1,3-cyclobutanediol were reacted
together in the presence of 200 ppm of the catalyst butyltin
tris(2-ethylhexanoate). The reaction was carried out under a
nitrogen gas purge in an 18-gallon stainless steel pressure vessel
fitted with a condensing column, a vacuum system, and a
HELICONE-type agitator. With the agitator running at 25 RPM, the
reaction mixture temperature was increased to 250.degree. C. and
the pressure was increased to 20 psig. The reaction mixture was
held for 2 hours at 250.degree. C. and 20 psig pressure. The
pressure was then decreased to 0 psig at a rate of 3 psig/minute.
The temperature of the reaction mixture was then increased to
270.degree. C. and the pressure was decreased to 90 mm of Hg. After
a 1 hour hold time at 270.degree. C. and 90 mm of Hg, the agitator
speed was decreased to 15 RPM, the reaction mixture temperature was
increased to 290.degree. C., and the pressure was decreased to
<1 mm of Hg. The reaction mixture was held at 290.degree. C. and
at a pressure of <1 mm of Hg for 12 minutes. The pressure of the
pressure vessel was then increased to 1 atmosphere using nitrogen
gas. The molten polymer was then extruded from the pressure vessel.
The cooled, extruded polymer was ground to pass a 6-mm screen. The
polymer had an inherent viscosity of 0.590 dL/g and a Tg of
106.degree. C. NMR analysis showed that the polymer was composed of
77.1 mol % 1,4-cyclohexane-dimethanol residues and 22.9 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues. The polymer had
color values of: L*=83.27, a*=-1.34, and b*=5.08.
Example 3I
[0252] 21.24 lb (49.71 gram-mol) dimethyl terephthalate, 12.61 lb
(39.77 gram-mol) 1,4-cyclohexanedimethanol, and 6.30 lb (19.88
gram-mol) 2,2,4,4-tetramethyl-1,3-cyclobutanediol were reacted
together in the presence of 200 ppm of the catalyst butyltin
tris(2-ethylhexanoate). The reaction was carried out under a
nitrogen gas purge in an 18-gallon stainless steel pressure vessel
fitted with a condensing column, a vacuum system, and a
HELICONE-type agitator. With the agitator running at 25 RPM, the
reaction mixture temperature was increased to 250.degree. C. and
the pressure was increased to 20 psig. The reaction mixture was
held for 2 hours at 250.degree. C. and 20 psig pressure. The
pressure was then decreased to 0 psig at a rate of 3 psig/minute.
The temperature of the reaction mixture was then increased to
270.degree. C. and the pressure was decreased to 90 mm of Hg. After
a 1 hour hold time at 270.degree. C. and 90 mm of Hg, the agitator
speed was decreased to 15 RPM, the reaction mixture temperature was
increased to 290.degree. C., and the pressure was decreased to 4 mm
of Hg. The reaction mixture was held at 290.degree. C. and at a
pressure of 4 mm of Hg for 30 minutes. The pressure of the pressure
vessel was then increased to 1 atmosphere using nitrogen gas. The
molten polymer was then extruded from the pressure vessel. The
cooled, extruded polymer was ground to pass a 6-mm screen. The
polymer had an inherent viscosity of 0.531 dL/g and a Tg of
105.degree. C. NMR analysis showed that the polymer was composed of
76.9 mol % 1,4-cyclohexane-dimethanol residues and 23.1 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues. The polymer had
color values of: L*=80.42, a*=-1.28, and b*=5.13.
Example 4
[0253] This example illustrates that
2,2,4,4-tetramethyl-1,3-cyclobutanediol can improve the toughness
of PCT-based copolyesters(polyesters containing terephthalic acid
and 1,4-cyclohexanedimethanol). Polyesters prepared in this example
fall comprise more than 25 to less than 40 mol % of
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues.
[0254] Copolyesters based on dimethyl terephthalate,
2,2,4,4-tetramethyl-1,3-cyclobutanediol, and
1,4-cyclohexanedimethanol (31/69 cis/trans) were prepared as
described below, having the composition and properties shown on
Table 4. The balance up to 100 mol % of the diol component of the
polyesters in Table 4 was 1,4-cyclohexanedimethanol (31/69
cis/trans).
[0255] Materials were injection molded into both 3.2 mm and 6.4 mm
thick bars and subsequently notched for Izod impact testing. The
notched Izod impact strengths were obtained at 23.degree. C. and
are reported in Table 4. Density, Tg, and crystallization halftime
were measured on the molded bars. Melt viscosity was measured on
pellets at 290.degree. C. TABLE-US-00005 TABLE 4 Compilation of
various properties for certain polyesters useful in the invention
Notched Notched Izod of Izod of 3.2 mm 6.4 mm Melt thick thick
Crystallization Viscosity Pellet Molded bars at bars at Specific
Halftime from at 1 rad/sec TMCD % cis IV Bar IV 23.degree. C.
23.degree. C. Gravity Tg melt at 170.degree. C. at 290.degree. C.
Example mole % TMCD (dl/g) (dl/g) (J/m) (J/m) (g/mL) (.degree. C.)
(min) (Poise) A 27 47.8 0.714 0.678 877 878 1.178 113 280 8312 B 31
NA 0.667 0.641 807 789 1.174 116 600 6592 NA = Not available
Example 4A
[0256] 21.24 lb (49.71 gram-mol) dimethyl terephthalate, 11.82 lb
(37.28 gram-mol) 1,4-cyclohexanedimethanol, and 6.90 lb (21.77
gram-mol) 2,2,4,4-tetramethyl-1,3-cyclobutanediol were reacted
together in the presence of 200 ppm of the catalyst butyltin
tris(2-ethylhexanoate). The reaction was carried out under a
nitrogen gas purge in an 18-gallon stainless steel pressure vessel
fitted with a condensing column, a vacuum system, and a
HELICONE-type agitator. With the agitator running at 25 RPM, the
reaction mixture temperature was increased to 250.degree. C. and
the pressure was increased to 20 psig. The reaction mixture was
held for 2 hours at 250.degree. C. and 20 psig pressure. The
pressure was then decreased to 0 psig at a rate of 3 psig/minute.
The temperature of the reaction mixture was then increased to
270.degree. C. and the pressure was decreased to 90 mm of Hg. After
a 1 hour hold time at 270.degree. C. and 90 mm of Hg, the agitator
speed was decreased to 15 RPM, the reaction mixture temperature was
increased to 290.degree. C., and the pressure was decreased to
<1 mm of Hg. The reaction mixture was held at 290.degree. C. and
at a pressure of <1 mm of Hg until the power draw to the
agitator no longer increased (50 minutes). The pressure of the
pressure vessel was then increased to 1 atmosphere using nitrogen
gas. The molten polymer was then extruded from the pressure vessel.
The cooled, extruded polymer was ground to pass a 6-mm screen. The
polymer had an inherent viscosity of 0.714 dL/g and a Tg of
113.degree. C. NMR analysis showed that the polymer was composed of
73.3 mol % 1,4-cyclohexane-dimethanol residues and 26.7 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues.
Example 4B
[0257] The polyester of Example 4B was prepared following a
procedure similar to the one described for Example 4A. The
composition and properties of this polyester are shown in Table
4.
Example 5
[0258] This example illustrates that
2,2,4,4-tetramethyl-1,3-cyclobutanediol can improve the toughness
of PCT-based copolyesters (polyesters containing terephthalic acid
and 1,4-cyclohexanedimethanol). Polyesters prepared in this example
comprise 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues in an
amount of 40 mol % or greater.
[0259] Copolyesters based on dimethyl terephthalate,
2,2,4,4-tetramethyl-1,3-cyclobutanediol, and
1,4-cyclohexanedimethanol were prepared as described below, having
the composition and properties shown on Table 5. The balance up to
100 mol % of the diol component of the polyesters in Table 5 was
1,4-cyclohexanedimethanol (31/69 cis/trans).
[0260] Materials were injection molded into both 3.2 mm and 6.4 mm
thick bars and subsequently notched for Izod impact testing. The
notched Izod impact strengths were obtained at 23.degree. C. and
are reported in Table 5. Density, Tg, and crystallization halftime
were measured on the molded bars. Melt viscosity was measured on
pellets at 290.degree. C. TABLE-US-00006 TABLE 5 Compilation of
various properties for certain polyesters useful in the invention
Notched Notched Izod of Izod of 3.2 mm 6.4 mm Melt thick thick
Crystallization Viscosity Pellet Molded bars at bars at Specific
Halftime from at 1 rad/sec TMCD % cis IV Bar IV 23.degree. C.
23.degree. C. Gravity Tg melt at 170.degree. C. at 290.degree. C.
Example mole % TMCD (dl/g) (dl/g) (J/m) (J/m) (g/mL) (.degree. C.)
(min) (Poise) A 44 46.2 0.657 0.626 727 734 1.172 119 NA 9751 B 45
NA 0.626 0.580 748 237 1.167 123 NA 8051 C 45 NA 0.582 0.550 671
262 1.167 125 19782 5835 D 45 NA 0.541 0.493 424 175 1.167 123 NA
3275 E 59 46.6 0.604 0.576 456 311 1.156 139 NA 16537 F 45 47.2
0.475 0.450 128 30 1.169 121 NA 1614 NA = Not available
Example 5A
[0261] 21.24 lb (49.71 gram-mol) dimethyl terephthalate, 8.84 lb
(27.88 gram-mol) 1,4-cyclohexanedimethanol, and 10.08 lb (31.77
gram-mol) 2,2,4,4-tetramethyl-1,3-cyclobutanediol were reacted
together in the presence of 200 ppm of the catalyst butyltin
tris(2-ethylhexanoate). The reaction was carried out under a
nitrogen gas purge in an 18-gallon stainless steel pressure vessel
fitted with a condensing column, a vacuum system, and a
HELICONE-type agitator. With the agitator running at 25 RPM, the
reaction mixture temperature was increased to 250.degree. C. and
the pressure was increased to 20 psig. The reaction mixture was
held for 2 hours at 250.degree. C. and 20 psig pressure. The
pressure was then decreased to 0 psig at a rate of 3 psig/minute.
Then the agitator speed was decreased to 15 RPM, the temperature of
the reaction mixture was then increased to 290.degree. C. and the
pressure was decreased to 2 mm of Hg. The reaction mixture was held
at 290.degree. C. and at a pressure of 2 mm of Hg until the power
draw to the agitator no longer increased (80 minutes). The pressure
of the pressure vessel was then increased to 1 atmosphere using
nitrogen gas. The molten polymer was then extruded from the
pressure vessel. The cooled, extruded polymer was ground to pass a
6-mm screen. The polymer had an inherent viscosity of 0.657 dL/g
and a Tg of 119.degree. C. NMR analysis showed that the polymer was
composed of 56.3 mol % 1,4-cyclohexane-dimethanol residues and 43.7
mol % 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues. The polymer
had color values of: L*=75.04, a*=-1.82, and b*=6.72.
Example 5B to Example 5D
[0262] The polyesters described in Example 5B to Example 5D were
prepared following a procedure similar to the one described for
Example 5A. The composition and properties of these polyesters are
shown in Table 5.
Example 5E
[0263] 21.24 lb (49.71 gram-mol) dimethyl terephthalate, 6.43 lb
(20.28 gram-mol 1,4-cyclohexanedimethanol, and 12.49 lb (39.37
gram-mol) 2,2,4,4-tetramethyl-1,3-cyclobutanediol were reacted
together in the presence of 200 ppm of the catalyst butyltin
tris(2-ethylhexanoate). The reaction was carried out under a
nitrogen gas purge in an 18-gallon stainless steel pressure vessel
fitted with a condensing column, a vacuum system, and a
HELICONE-type agitator. With the agitator running at 25 RPM, the
reaction mixture temperature was increased to 250.degree. C. and
the pressure was increased to 20 psig. The reaction mixture was
held for 2 hours at 250.degree. C. and 20 psig pressure. The
pressure was then decreased to 0 psig at a rate of 3 psig/minute.
Then the agitator speed was decreased to 15 RPM, the temperature of
the reaction mixture was then increased to 290.degree. C. and the
pressure was decreased to 2 mm of Hg. The reaction mixture was held
at 290.degree. C. and at a pressure of <1 mm of Hg until the
power draw to the agitator no longer increased (50 minutes). The
pressure of the pressure vessel was then increased to 1 atmosphere
using nitrogen gas. The molten polymer was then extruded from the
pressure vessel. The cooled, extruded polymer was ground to pass a
6-mm screen. The polymer had an inherent viscosity of 0.604 dL/g
and a Tg of 139.degree. C. NMR analysis showed that the polymer was
composed of 40.8 mol % 1,4-cyclohexanedimethanol residues and 59.2
mol % 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues. The polymer
had color values of: L*=80.48, a*=-1.30, and b*=6.82.
Example 5F
[0264] 21.24 lb (49.71 gram-mol) dimethyl terephthalate, 8.84 lb
(27.88 gram-mol) 1,4-cyclohexanedimethanol, and 10.08 lb (31.77
gram-mol) 2,2,4,4-tetramethyl-1,3-cyclobutanediol were reacted
together in the presence of 200 ppm of the catalyst butyltin
tris(2-ethylhexanoate). The reaction was carried out under a
nitrogen gas purge in an 18-gallon stainless steel pressure vessel
fitted with a condensing column, a vacuum system, and a
HELICONE-type agitator. With the agitator running at 25 RPM, the
reaction mixture temperature was increased to 250.degree. C. and
the pressure was increased to 20 psig. The reaction mixture was
held for 2 hours at 250.degree. C. and 20 psig pressure. The
pressure was then decreased to 0 psig at a rate of 3 psig/minute.
The temperature of the reaction mixture was then increased to
270.degree. C. and the pressure was decreased to 90 mm of Hg. After
a 1 hour hold time at 270.degree. C. and 90 mm of Hg, the agitator
speed was decreased to 15 RPM and the pressure was decreased to 4
mm of Hg. When the reaction mixture temperature was 270.degree. C.
and the pressure was 4 mm of Hg, the pressure of the pressure
vessel was immediately increased to 1 atmosphere using nitrogen
gas. The molten polymer was then extruded from the pressure vessel.
The cooled, extruded polymer was ground to pass a 6-mm screen. The
polymer had an inherent viscosity of 0.475 dL/g and a Tg of
121.degree. C. NMR analysis showed that the polymer was composed of
55.5 mol % 1,4-cyclohexane-dimethanol residues and 44.5 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues. The polymer had
color values of: L*=85.63, a*=-0.88, and b*=4.34.
Example 6
Comparative Example
[0265] This example shows data for comparative materials in Table
6. The PC was Makrolon 2608 from Bayer, with a nominal composition
of 100 mole % bisphenol A residues and 100 mole % diphenyl
carbonate residues. Makrolon 2608 has a nominal melt flow rate of
20 grams/10 minutes measured at 300 C using a 1.2 kg weight. The
PET was Eastar 9921 from Eastman Chemical Company, with a nominal
composition of 100 mole % terephthalic acid, 3.5 mole %
cyclohexanedimethanol (CHDM) and 96.5 mole % ethylene glycol. The
PETG was Eastar 6763 from Eastman Chemical Company, with a nominal
composition of 100 mole % terephthalic acid, 31 mole %
cyclohexanedimethanol (CHDM) and 69 mole % ethylene glycol. The
PCTG was Eastar DN001 from Eastman Chemical Company, with a nominal
composition of 100 mole % terephthalic acid, 62 mole %
cyclohexanedimethanol (CHDM) and 38 mole % ethylene glycol. The
PCTA was Eastar AN001 from Eastman Chemical Company, with a nominal
composition of 65 mole % terephthalic acid, 35 mole % isophthalic
acid and 100 mole % cyclohexanedimethanol (CHDM). The Polysulfone
was Udel 1700 from Solvay, with a nominal composition of 100 mole %
bisphenol A residues and 100 mole % 4,4-dichlorosulfonyl sulfone
residues. Udel 1700 has a nominal melt flow rate of 6.5 grams/10
minutes measured at 343 C using a 2.16 kg weight. The SAN was
Lustran 31 from Lanxess, with a nominal composition of 76 weight %
styrene and 24 weight % acrylonitrile. Lustran 31 has a nominal
melt flow rate of 7.5 grams/10 minutes measured at 230 C using a
3.8 kg weight. The examples of the invention show improved
toughness in 6.4 mm thickness bars compared to all of the other
resins. TABLE-US-00007 TABLE 6 Compilation of various properties
for certain commercial polymers Notched Notched Izod of Izod of 3.2
mm 6.4 mm thick thick Crystallization Pellet Molded bars at bars at
Specific Halftime from Polymer IV Bar IV 23.degree. C. 23.degree.
C. Gravity Tg melt Example name (dl/g) (dl/g) (J/m) (J/m) (g/mL)
(.degree. C.) (min) A PC 12 MFR NA 929 108 1.20 146 NA B PCTG 0.73
0.696 NB 70 1.23 87 30 at 170.degree. C. C PCTA 0.72 0.702 98 59
1.20 87 15 at 150.degree. C. D PETG 0.75 0.692 83 59 1.27 80 2500
at 130.degree. C. E PET 0.76 0.726 45 48 1.33 78 1.5 at 170.degree.
C. F SAN 7.5 MFR NA 21 NA 1.07 .about.110 NA G PSU 6.5 MFR NA 69 NA
1.24 .about.190 NA NA = Not available
Example 7
[0266] This example illustrates the effect of the amount of
2,2,4,4-tetramethyl-1,3-cyclobutanediol used for the preparation of
the polyesters of the invention on the glass transition temperature
of the polyesters. Polyesters prepared in this example comprise
from 15 to 25 mol % of 2,2,4,4-tetramethyl-1,3-cyclobutanediol
residues.
Example 7A to Example 7F
[0267] Dimethyl terephthalate, 1,4-cyclohexanedimethanol, and
2,2,4,4-tetramethyl-1,3-cyclobutanediol were weighed into a 500-ml
single neck round bottom flask. NMR analysis on the
2,2,4,4-tetramethyl-1,3-cyclobutanediol starting material showed a
cis/trans ratio of 53/47. The polyesters of this example were
prepared with a 1.2/1 glycol/acid ratio with the entire excess
coming from the 2,2,4,4-tetramethyl-1,3-cyclobutanediol. Enough
dibutyltin oxide catalyst was added to give 300 ppm tin in the
final polymer. The flask was under a 0.2 SCFC nitrogen purge with
vacuum reduction capability. The flask was immersed in a Belmont
metal bath at 200.degree. C. and stirred at 200 RPM after the
reactants had melted. After about 2.5 hours, the temperature was
raised to 210.degree. C. and these conditions were held for an
additional 2 hours. The temperature was raised to 285.degree. C.
(in approximately 25 minutes) and the pressure was reduced to 0.3
mm of Hg over a period of 5 minutes. The stirring was reduced as
the viscosity increased, with 15 RPM being the minimum stirring
used. The total polymerization time was varied to attain the target
inherent viscosities. After the polymerization was complete, the
Belmont metal bath was lowered and the polymer was allowed to cool
to below its glass transition temperature. After about 30 minutes,
the flask was reimmersed in the Belmont metal bath (the temperature
had been increased to 295.degree. C. during this 30 minute wait)
and the polymer mass was heated until it pulled away from the glass
flask. The polymer mass was stirred at mid level in the flask until
the polymer had cooled. The polymer was removed from the flask and
ground to pass a 3 mm screen. Variations to this procedure were
made to produce the copolyesters described below with a targeted
composition of 20 mol %.
[0268] Inherent viscosities were measured as described in the
"Measurement Methods" section above. The compositions of the
polyesters were determined by .sup.1H NMR as explained before in
the Measurement Methods section. The glass transition temperatures
were determined by DSC, using the second heat after quench at a
rate of 20.degree. C./min.
Example 7G to Example 7P
[0269] These polyesters were prepared by carrying out the ester
exchange and polycondensation reactions in separate stages. The
ester exchange experiments were conducted in a continuous
temperature rise (CTR) reactor. The CTR was a 3000 ml glass reactor
equipped with a single shaft impeller blade agitator, covered with
an electric heating mantle and fitted with a heated packed reflux
condenser column. The reactor was charged with 777 g ( 4 moles) of
dimethyl terephthalate, 230 g (1.6 moles) of
2,2,4,4-tetramethyl-1,3,-cyclobutanediol, 460.8 g (3.2 moles) of
cyclohexane dimethanol and 1.12 g of butyltin tris-2-ethylhexanoate
(such that there will be 200 ppm tin metal in the final polymer).
The heating mantle was set manually to 100% output. The set points
and data collection were facilitated by a Camile process control
system. Once the reactants were melted, stirring was initiated and
slowly increased to 250 rpm. The temperature of the reactor
gradually increased with run time. The weight of methanol collected
was recorded via balance. The reaction was stopped when methanol
evolution stopped or at a pre-selected lower temperature of
260.degree. C. The oligomer was discharged with a nitrogen purge
and cooled to room temperature. The oligomer was frozen with liquid
nitrogen and broken into pieces small enough to be weighed into a
500 ml round bottom flask.
[0270] In the polycondensation reactions, a 500 ml round bottom
flask was charged with approximately 150 g of the oligomer prepared
above. The flask was equipped with a stainless steel stirrer and
polymer head. The glassware was set up on a half mole polymer rig
and the Camile sequence was initiated. The stirrer was positioned
one full turn from the flask bottom once the oligomer melted. The
temperature/pressure/stir rate sequence controlled by the Camile
software for each example is reported in the following tables.
[0271] Camile Sequence for Example 7G and Example 7H TABLE-US-00008
Time Temp Vacuum Stir Stage (min) (.degree. C.) (torr) (rpm) 1 5
245 760 0 2 5 245 760 50 3 30 265 760 50 4 3 265 90 50 5 110 290 90
50 6 5 290 6 25 7 110 290 6 25
[0272] Camile Sequence for Example 7M to Example 7P TABLE-US-00009
Time Temp Vacuum Stir Stage (min) (.degree. C.) (torr) (rpm) 1 5
245 760 0 2 5 245 760 50 3 30 265 760 50 4 3 265 90 50 5 110 290 90
50 6 5 290 3 25 7 110 290 3 25
[0273] Camile Sequence for Example 7J and Example 7K TABLE-US-00010
Time Temp Vacuum Stir Stage (min) (.degree. C.) (torr) (rpm) 1 5
245 760 0 2 5 245 760 50 3 30 265 760 50 4 3 265 90 50 5 110 290 90
50 6 5 290 2 25 7 110 290 2 25
[0274] Camile Sequence for Example 7I and Example 7L TABLE-US-00011
Time Temp Vacuum Stir Stage (min) (.degree. C.) (torr) (rpm) 1 5
245 760 0 2 5 245 760 50 3 30 265 760 50 4 3 265 90 50 5 110 290 90
50 6 5 290 1 25 7 110 290 1 25
[0275] The resulting polymers were recovered from the flask,
chopped using a hydraulic chopper, and ground to a 6 mm screen
size. Samples of each ground polymer were submitted for inherent
viscosity in 60/40 (wt/wt) phenol/tetrachloroethane at a
concentration of 0.5 g/100 ml at 25.degree. C., catalyst level (Sn)
by x-ray fluorescence, and color (L*, a*, b*) by transmission
spectroscopy. Polymer composition was obtained by .sup.1H NMR.
Samples were submitted for thermal stability and melt viscosity
testing using a Rheometrics Mechanical Spectrometer (RMS-800).
[0276] The table below shows the experimental data for the
polyesters of this example. The data shows that an increase in the
level of 2,2,4,4-tetramethyl-1,3-cyclobutanediol raises the glass
transition temperature in an almost linear fashion, for a constant
inherent viscosity. FIG. 3 also shows the dependence of Tg on
composition and inherent viscosity. TABLE-US-00012 TABLE 7 Glass
transition temperature as a function of inherent viscosity and
composition IV .eta..sub.o at .eta..sub.o at .eta..sub.o at mol % %
cis (dL/ T.sub.g 260.degree. C. 275.degree. C. 290.degree. C.
Example TMCD TMCD g) (.degree. C.) (Poise) (Poise) (Poise) A 20
51.4 0.72 109 11356 19503 5527 B 19.1 51.4 0.60 106 6891 3937 2051
C 19 53.2 0.64 107 8072 4745 2686 D 18.8 54.4 0.70 108 14937 8774
4610 E 17.8 52.4 0.50 103 3563 1225 883 F 17.5 51.9 0.75 107 21160
10877 5256 G 22.8 53.5 0.69 109 NA NA NA H 22.7 52.2 0.68 108 NA NA
NA I 23.4 52.4 0.73 111 NA NA NA J 23.3 52.9 0.71 111 NA NA NA K
23.3 52.4 0.74 112 NA NA NA L 23.2 52.5 0.74 112 NA NA NA M 23.1
52.5 0.71 111 NA NA NA N 22.8 52.4 0.73 112 NA NA NA O 22.7 53 0.69
112 NA NA NA P 22.7 52 0.70 111 NA NA NA NA = Not available
Example 8
[0277] This example illustrates the effect of the amount of
2,2,4,4-tetramethyl-1,3-cyclobutanediol used for the preparation of
the polyesters of the invention on the glass transition temperature
of the polyesters. Polyesters prepared in this example fall
comprise more than 25 to less than 40 mol % of
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues.
[0278] Dimethyl terephthalate, 1,4-cyclohexanedimethanol, and
2,2,4,4-tetramethyl-1,3-cyclobutanediol were weighed into a 500-ml
single neck round bottom flask. NMR analysis on the
2,2,4,4-tetramethyl-1,3-cyclobutanediol starting material showed a
cis/trans ratio of 53/47. The polyesters of this example were
prepared with a 1.2/1 glycol/acid ratio with the entire excess
coming from the 2,2,4,4-tetramethyl-1,3-cyclobutanediol. Enough
dibutyltin oxide catalyst was added to give 300 ppm tin in the
final polymer. The flask was under a 0.2 SCFC nitrogen purge with
vacuum reduction capability. The flask was immersed in a Belmont
metal bath at 200.degree. C. and stirred at 200 RPM after the
reactants had melted. After about 2.5 hours, the temperature was
raised to 210.degree. C. and these conditions were held for an
additional 2 hours. The temperature was raised to 285.degree. C.
(in approximately 25 minutes) and the pressure was reduced to 0.3
mm of Hg over a period of 5 minutes. The stirring was reduced as
the viscosity increased, with 15 RPM being the minimum stirring
used. The total polymerization time was varied to attain the target
inherent viscosities. After the polymerization was complete, the
Belmont metal bath was lowered and the polymer was allowed to cool
to below its glass transition temperature. After about 30 minutes,
the flask was reimmersed in the Belmont metal bath (the temperature
had been increased to 295.degree. C. during this 30 minute wait)
and the polymer mass was heated until it pulled away from the glass
flask. The polymer mass was stirred at mid level in the flask until
the polymer had cooled. The polymer was removed from the flask and
ground to pass a 3 mm screen. Variations to this procedure were
made to produce the copolyesters described below with a targeted
composition of 32 mol %.
[0279] Inherent viscosities were measured as described in the
"Measurement Methods" section above. The compositions of the
polyesters were determined by .sup.1H NMR as explained before in
the Measurement Methods section. The glass transition temperatures
were determined by DSC, using the second heat after quench at a
rate of 20.degree. C./min.
[0280] The table below shows the experimental data for the
polyesters of this example. FIG. 3 also shows the dependence of Tg
on composition and inherent viscosity. The data shows that an
increase in the level of 2,2,4,4-tetramethyl-1,3-cyclobutanediol
raises the glass transition temperature in an almost linear
fashion, for a constant inherent viscosity. TABLE-US-00013 TABLE 8
Glass transition temperature as a function of inherent viscosity
and composition IV .eta..sub.o at .eta..sub.o at .eta..sub.o at mol
% % cis (dL/ T.sub.g 260.degree. C. 275.degree. C. 290.degree. C.
Example TMCD TMCD g) (.degree. C.) (Poise) (Poise) (Poise) A 32.2
51.9 0.71 118 29685 16074 8522 B 31.6 51.5 0.55 112 5195 2899 2088
C 31.5 50.8 0.62 112 8192 4133 2258 D 30.7 50.7 0.54 111 4345 2434
1154 E 30.3 51.2 0.61 111 7929 4383 2261 F 30.0 51.4 0.74 117 31476
17864 8630 G 29.0 51.5 0.67 112 16322 8787 4355 H 31.1 51.4 0.35
102 NA NA NA NA = Not available
Example 9
[0281] This example illustrates the effect of the amount of
2,2,4,4-tetramethyl-1,3-cyclobutanediol used for the preparation of
the polyesters of the invention on the glass transition temperature
of the polyesters. Polyesters prepared in this example comprise
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues in an amount of 40
mol % or greater.
Examples A to AC
[0282] These polyesters were prepared by carrying out the ester
exchange and polycondensation reactions in separate stages. The
ester exchange experiments were conducted in a continuous
temperature rise (CTR) reactor. The CTR was a 3000 ml glass reactor
equipped with a single shaft impeller blade agitator, covered with
an electric heating mantle and fitted with a heated packed reflux
condenser column. The reactor was charged with 777 g of dimethyl
terephthalate, 375 g of 2,2,4,4-tetramethyl-1,3,-cyclobutanediol,
317 g of cyclohexane dimethanol and 1.12 g of butyltin
tris-2-ethylhexanoate (such that there will be 200 ppm tin metal in
the final polymer). The heating mantle was set manually to 100%
output. The set points and data collection were facilitated by a
Camile process control system. Once the reactants were melted,
stirring was initiated and slowly increased to 250 rpm. The
temperature of the reactor gradully increased with run time. The
weight of methanol collected was recorded via balance. The reaction
was stopped when methanol evolution stopped or at a pre-selected
lower temperature of 260.degree. C. The oligomer was discharged
with a nitrogen purge and cooled to room temperature. The oligomer
was frozen with liquid nitrogen and broken into pieces small enough
to be weighed into a 500 ml round bottom flask.
[0283] In the polycondensation reactions, a 500 ml round bottom
flask was charged with 150 g of the oligomer prepared above. The
flask was equipped with a stainless steel stirrer and polymer head.
The glassware was set up on a half mole polymer rig and the Camile
sequence was initiated. The stirrer was positioned one full turn
from the flask bottom once the oligomer melted. The
temperature/pressure/stir rate sequence controlled by the Camile
software for these examples is reported in the following table,
unless otherwise specified below.
[0284] Camile Sequence for Polycondensation Reactions
TABLE-US-00014 Vacuum Stage Time (min) Temp (.degree. C.) (torr)
Stir (rpm) 1 5 245 760 0 2 5 245 760 50 3 30 265 760 50 4 3 265 90
50 5 110 290 90 50 6 5 290 6 25 7 110 290 6 25
[0285] Camile Sequence for Examples A, C, R, Y, AB, AC
TABLE-US-00015 Vacuum Stage Time (min) Temp (.degree. C.) (torr)
Stir (rpm) 1 5 245 760 0 2 5 245 760 50 3 30 265 760 50 4 3 265 90
50 5 110 290 90 50 6 5 290 6 25 7 110 290 6 25
[0286] For Examples B, D, F, the same sequence in the preceding
table was used, except the time was 80 min in Stage 7. For Examples
G and J, the same sequence in the preceding table was used, except
the time was 50 min in Stage 7. For Example L, the same sequence in
the preceding table was used, except the time was 140 min in Stage
7.
[0287] Camile Sequence for Example E TABLE-US-00016 Vacuum Stage
Time (min) Temp (.degree. C.) (torr) Stir (rpm) 1 5 245 760 0 2 5
245 760 50 3 30 265 760 50 4 3 265 90 50 5 110 300 90 50 6 5 300 7
25 7 110 300 7 25
[0288] For Example I, the same sequence in the preceding table was
used, except the vacuum was 8 torr in Stages 6 and 7. For Example
O, the same sequence in the preceding table was used, except the
vacuum was 6 torr in Stages 6 and 7. For Example P, the same
sequence in the preceding table was used, except the vacuum was 4
torr in Stages 6 and 7. For Example Q, the same sequence in the
preceding table was used, except the vacuum was 5 torr in Stages 6
and 7.
[0289] Camile Sequence for Example H TABLE-US-00017 Vacuum Stage
Time (min) Temp (.degree. C.) (torr) Stir (rpm) 1 5 245 760 0 2 5
245 760 50 3 30 265 760 50 4 3 265 90 50 5 110 280 90 50 6 5 280 5
25 7 110 280 5 25
[0290] For Example U and AA, the same sequence in the preceding
table was used, except the vacuum was 6 torr in Stages 6 and 7. For
Example V and X, the same sequence in the preceding table was used,
except the vacuum was 6 torr and stir rate was 15 rpm in Stages 6
and 7. For Example Z, the same sequence in the preceding table was
used, except the stir rate was 15 rpm in Stages 6 d 7.
[0291] Camile Sequence for Example K TABLE-US-00018 Vacuum Stage
Time (min) Temp (.degree. C.) (torr) Stir (rpm) 1 5 245 760 0 2 5
245 760 50 3 30 265 760 50 4 3 265 90 50 5 110 300 90 50 6 5 300 6
15 7 110 300 6 15
[0292] For Example M, the same sequence in the preceding table was
used, except the vacuum was 8 torr in Stages 6 and 7. For Example
N, the same sequence in the preceding table was used, except the
vacuum was 7 torr in Stages 6 and 7.
[0293] Camile Sequence for Examples S and T TABLE-US-00019 Vacuum
Stage Time (min) Temp (.degree. C.) (torr) Stir (rpm) 1 5 245 760 0
2 5 245 760 50 3 30 265 760 50 4 5 290 6 25 5 110 290 6 25
[0294] The resulting polymers were recovered from the flask,
chopped using a hydraulic chopper, and ground to a 6 mm screen
size. Samples of each ground polymer were submitted for inherent
viscosity in 60/40 (wt/wt) phenol/tetrachloroethane at a
concentration of 0.5 g/100 ml at 25.degree. C., catalyst level (Sn)
by x-ray fluorescence, and color (L*, a*, b*) by transmission
spectroscopy. Polymer composition was obtained by 1H NMR. Samples
were submitted for thermal stability and melt viscosity testing
using a Rheometrics Mechanical Spectrometer (RMS-800).
Examples AD to AK and AT
[0295] The polyesters of these examples were prepared as described
above for Examples A to AC, except that the target tin amount in
the final polymer was 150 ppm for examples AD to AK and AT. The
following tables described the temperature/pressure/stir rate
sequences controlled by the Camile software for these examples.
[0296] Camile Sequence for Examples AD, AF, and AH TABLE-US-00020
Vacuum Stage Time (min) Temp (.degree. C.) (torr) Stir (rpm) 1 5
245 760 0 2 5 245 760 50 3 30 265 760 50 4 3 265 400 50 5 110 290
400 50 6 5 290 8 50 7 110 295 8 50
[0297] For Example AD, the stirrer was turned to 25 rpm with 95 min
left in Stage 7.
[0298] Camile Sequence for Example AE TABLE-US-00021 Vacuum Stage
Time (min) Temp (.degree. C.) (torr) Stir (rpm) 1 10 245 760 0 2 5
245 760 50 3 30 283 760 50 4 3 283 175 50 5 5 283 5 50 6 5 283 1.2
50 7 71 285 1.2 50
[0299] For Example AK, the same sequence in the preceding table was
used, except the time was 75 min in Stage 7.
[0300] Camile Sequence for Example AG TABLE-US-00022 Vacuum Stage
Time (min) Temp (.degree. C.) (torr) Stir (rpm) 1 10 245 760 0 2 5
245 760 50 3 30 285 760 50 4 3 285 175 50 5 5 285 5 50 6 5 285 4 50
7 220 290 4 50
[0301] Camile Sequence for Example AI TABLE-US-00023 Vacuum Stage
Time (min) Temp (.degree. C.) (torr) Stir (rpm) 1 5 245 760 0 2 5
245 760 50 3 30 265 760 50 4 3 265 90 50 5 110 285 90 50 6 5 285 6
50 7 70 290 6 50
[0302] Camile Sequence for Example AJ TABLE-US-00024 Vacuum Stage
Time (min) Temp (.degree. C.) (torr) Stir (rpm) 1 5 245 760 0 2 5
245 760 50 3 30 265 760 50 4 3 265 90 50 5 110 290 90 50 6 5 290 6
25 7 110 295 6 25
Examples AL to AS
[0303] Dimethyl terephthalate, 1,4-cyclohexanedimethanol, and
2,2,4,4-tetramethyl-1,3-cyclobutanediol were weighed into a 500-ml
single neck round bottom flask. The polyesters of this example were
prepared with a 1.2/1 glycol/acid ratio with the entire excess
coming from the 2,2,4,4-tetramethyl-1,3-cyclobutanediol. Enough
dibutyltin oxide catalyst was added to give 300 ppm tin in the
final polymer. The flask was under a 0.2 SCFC nitrogen purge with
vacuum reduction capability. The flask was immersed in a Belmont
metal bath at 200.degree. C. and stirred at 200 RPM after the
reactants had melted. After about 2.5 hours, the temperature was
raised to 210.degree. C. and these conditions were held for an
additional 2 hours. The temperature was raised to 285.degree. C.
(in approximately 25 minutes) and the pressure was reduced to 0.3
mm of Hg over a period of 5 minutes. The stirring was reduced as
the viscosity increased, with 15 RPM being the minimum stirring
used. The total polymerization time was varied to attain the target
inherent viscosities. After the polymerization was complete, the
Belmont metal bath was lowered and the polymer was allowed to cool
to below its glass transition temperature. After about 30 minutes,
the flask was reimmersed in the Belmont metal bath (the temperature
had been increased to 295.degree. C. during this 30 minute wait)
and the polymer mass was heated until it pulled away from the glass
flask. The polymer mass was stirred at mid level in the flask until
the polymer had cooled. The polymer was removed from the flask and
ground to pass a 3 mm screen. Variations to this procedure were
made to produce the copolyesters described below with a targeted
composition of 45 mol %.
[0304] Inherent viscosities were measured as described in the
"Measurement Methods" section above. The compositions of the
polyesters were determined by .sup.1H NMR as explained before in
the Measurement Methods section. The glass transition temperatures
were determined by DSC, using the second heat after quench at a
rate of 20.degree. C./min.
[0305] The table below shows the experimental data for the
polyesters of this example. The data shows that an increase in the
level of 2,2,4,4-tetramethyl-1,3-cyclobutanediol raises the glass
transition temperature in an almost linear fashion, for a constant
inherent viscosity. FIG. 3 also shows the dependence of Tg on
composition and inherent viscosity. TABLE-US-00025 TABLE 9 Glass
transition temperature as a function of inherent viscosity and
composition IV .eta..sub.o at .eta..sub.o at .eta..sub.o at mol % %
cis (dL/ T.sub.g 260.degree. C. 275.degree. C. 290.degree. C.
Example TMCD TMCD g) (.degree. C.) (Poise) (Poise) (Poise) A 43.9
72.1 0.46 131 NA NA NA B 44.2 36.4 0.49 118 NA NA NA C 44 71.7 0.49
128 NA NA NA D 44.3 36.3 0.51 119 NA NA NA E 46.1 46.8 0.51 125 NA
NA NA F 43.6 72.1 0.52 128 NA NA NA G 43.6 72.3 0.54 127 NA NA NA H
46.4 46.4 0.54 127 NA NA NA I 45.7 47.1 0.55 125 NA NA NA J 44.4
35.6 0.55 118 NA NA NA K 45.2 46.8 0.56 124 NA NA NA L 43.8 72.2
0.56 129 NA NA NA M 45.8 46.4 0.56 124 NA NA NA N 45.1 47.0 0.57
125 NA NA NA O 45.2 46.8 0.57 124 NA NA NA P 45 46.7 0.57 125 NA NA
NA Q 45.1 47.1 0.58 127 NA NA NA R 44.7 35.4 0.59 123 NA NA NA S
46.1 46.4 0.60 127 NA NA NA T 45.7 46.8 0.60 129 NA NA NA U 46 46.3
0.62 128 NA NA NA V 45.9 46.3 0.62 128 NA NA NA X 45.8 46.1 0.63
128 NA NA NA Y 45.6 50.7 0.63 128 NA NA NA Z 46.2 46.8 0.65 129 NA
NA NA AA 45.9 46.2 0.66 128 NA NA NA AB 45.2 46.4 0.66 128 NA NA NA
AC 45.1 46.5 0.68 129 NA NA NA AD 46.3 52.4 0.52 NA NA NA NA AE
45.7 50.9 0.54 NA NA NA NA AF 46.3 52.6 0.56 NA NA NA NA AG 46 50.6
0.56 NA NA NA NA AH 46.5 51.8 0.57 NA NA NA NA AI 45.6 51.2 0.58 NA
NA NA NA AJ 46 51.9 0.58 NA NA NA NA AK 45.5 51.2 0.59 NA NA NA NA
AL 45.8 50.1 0.624 125 NA NA 7696 AM 45.7 49.4 0.619 128 NA NA 7209
AN 46.2 49.3 0.548 124 NA NA 2348 AP 45.9 49.5 0.72 128 76600 40260
19110 AQ 46.0 50 0.71 131 68310 32480 17817 AR 46.1 49.6 0.383 117
NA NA 387 AS 45.6 50.5 0.325 108 NA NA NA AT 47.2 NA 0.48 NA NA NA
NA NA = Not available
Example 10
[0306] This example illustrates the effect of the predominance of
the type of 2,2,4,4-tetramethyl-1,3-cyclobutanediol isomer (cis or
trans) on the glass transition temperature of the polyester.
[0307] Dimethyl terephthalate, 1,4-cyclohexanedimethanol, and
2,2,4,4-tetramethyl-1,3-cyclobutanediol were weighed into a 500-ml
single neck round bottom flask. The polyesters of this example were
prepared with a 1.2/1 glycol/acid ratio with the entire excess
coming from the 2,2,4,4-tetramethyl-1,3-cyclobutanediol. Enough
dibutyltin oxide catalyst was added to give 300 ppm tin in the
final polymer. The flask was under a 0.2 SCFC nitrogen purge with
vacuum reduction capability. The flask was immersed in a Belmont
metal bath at 200.degree. C. and stirred at 200 RPM after the
reactants had melted. After about 2.5 hours, the temperature was
raised to 210.degree. C. and these conditions were held for an
additional 2 hours. The temperature was raised to 285.degree. C.
(in approximately 25 minutes) and the pressure was reduced to 0.3
mm of Hg over a period of 5 minutes. The stirring was reduced as
the viscosity increased, with 15 RPM being the minimum stirring
used. The total polymerization time was varied to attain the target
inherent viscosities. After the polymerization was complete, the
Belmont metal bath was lowered and the polymer was allowed to cool
to below its glass transition temperature. After about 30 minutes,
the flask was reimmersed in the Belmont metal bath (the temperature
had been increased to 295.degree. C. during this 30 minute wait)
and the polymer mass was heated until it pulled away from the glass
flask. The polymer mass was stirred at mid level in the flask until
the polymer had cooled. The polymer was removed from the flask and
ground to pass a 3 mm screen. Variations to this procedure were
made to produce the copolyesters described below with a targeted
composition of 45 mol %.
[0308] Inherent viscosities were measured as described in the
"Measurement Methods" section above. The compositions of the
polyesters were determined by .sup.1H NMR as explained before in
the Measurement Methods section. The glass transition temperatures
were determined by DSC, using the second heat after quench at a
rate of 20.degree. C./min.
[0309] The table below shows the experimental data for the
polyesters of this Example. The data shows that cis
2,2,4,4-tetramethyl-1,3-cyclobutanediol is approximately twice as
effective as trans 2,2,4,4-tetramethyl-1,3-cyclobutanediol at
increasing the glass transition temperature for a constant inherent
viscosity. TABLE-US-00026 TABLE 10 Effect of
2,2,4,4-tetramethyl-1,3-cyclobutanediol cis/trans composition on
T.sub.g IV .eta..sub.o at .eta..sub.o at .eta..sub.o at mol % (dL/
T.sub.g 260.degree. C. 275.degree. C. 290.degree. C. % cis Example
TMCD g) (.degree. C.) (Poise) (Poise) (Poise) TMCD A 45.8 0.71 119
N.A. N.A. N.A. 4.1 B 43.2 0.72 122 N.A. N.A. N.A. 22.0 C 46.8 0.57
119 26306 16941 6601 22.8 D 43.0 0.67 125 55060 36747 14410 23.8 E
43.8 0.72 127 101000 62750 25330 24.5 F 45.9 0.533 119 11474 6864
2806 26.4 G 45.0 0.35 107 N.A. N.A. N.A. 27.2 H 41.2 0.38 106 1214
757 N.A. 29.0 I 44.7 0.59 123 N.A. N.A. N.A. 35.4 J 44.4 0.55 118
N.A. N.A. N.A. 35.6 K 44.3 0.51 119 N.A. N.A. N.A. 36.3 L 44.0 0.49
128 N.A. N.A. N.A. 71.7 M 43.6 0.52 128 N.A. N.A. N.A. 72.1 N 43.6
0.54 127 N.A. N.A. N.A. 72.3 O 41.5 0.58 133 15419 10253 4252 88.7
P 43.8 0.57 135 16219 10226 4235 89.6 Q 41.0 0.33 120 521 351 2261
90.4 R 43.0 0.56 134 N.A. N.A. N.A. 90.6 S 43.0 0.49 132 7055 4620
2120 90.6 T 43.1 0.55 134 12970 8443 3531 91.2 U 45.9 0.52 137 N.A.
N.A. N.A. 98.1 NA = not available
Example 11
[0310] This example illustrates the preparation of a copolyester
containing 100 mol % dimethyl terephthalate residues, 55 mol %
1,4-cyclohexanedimethanol residues, and 45 mol %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues.
[0311] A mixture of 97.10 g (0.5 mol) dimethyl terephthalate, 52.46
g (0.36 mol) 1,4-cyclohexanedimethanol, 34.07 g (0.24 mol)
2,2,4,4-tetramethyl-1,3-cyclobutanediol, and 0.0863 g (300 ppm)
dibutyl tin oxide was placed in a 500-milliliter flask equipped
with an inlet for nitrogen, a metal stirrer, and a short
distillation column. The flask was placed in a Wood's metal bath
already heated to 200.degree. C. The contents of the flask were
heated at 200.degree. C. for 1 hour and then the temperature was
increased to 210.degree. C. The reaction mixture was held at
210.degree. C. for 2 hours and then heated up to 290.degree. C. in
30 minutes. Once at 290.degree. C., a vacuum of 0.01 psig was
gradually applied over the next 3 to 5 minutes. Full vacuum (0.01
psig) was maintained for a total time of about 45 minutes to remove
excess unreacted diols. A high melt viscosity, visually clear and
colorless polymer was obtained with a glass transition temperature
of 125.degree. C. and an inherent viscosity of 0.64 dl/g.
Example 12
Comparative Example
[0312] This example illustrates that a polyester based on 100%
2,2,4,4-tetramethyl-1,3-cyclobutanediol has a slow crystallization
half-time.
[0313] A polyester based solely on terephthalic acid and
2,2,4,4-tetramethyl-1,3-cyclobutanediol was prepared in a method
similar to the method described in Example 1A with the properties
shown on Table 11. This polyester was made with 300 ppm dibutyl tin
oxide. The trans/cis ratio of the
2,2,4,4-tetramethyl-1,3-cyclobutanediol was 65/35.
[0314] Films were pressed from the ground polymer at 320.degree. C.
Crystallization half-time measurements from the melt were made at
temperatures from 220 to 250.degree. C. at 10.degree. C. increments
and are reported in Table 11. The fastest crystallization half-time
for the sample was taken as the minimum value of crystallization
half-time as a function of temperature. The fastest crystallization
half-time of this polyester is around 1300 minutes. This value
contrasts with the fact that the polyester (PCT) based solely on
terephthalic acid and 1,4-cyclohexanedimethanol (no comonomer
modification) has an extremely short crystallization half-time
(<1 min) as shown in FIG. 1. TABLE-US-00027 TABLE 11
Crystallization Half-times (min) at at at at Comonomer IV T.sub.g
T.sub.max 220.degree. C. 230.degree. C. 240.degree. C. 250.degree.
C. (mol %) (dl/g) (.degree. C.) (.degree. C.) (min) (min) (min)
(min) 100 mol %F 0.63 170.0 330 3291 3066 1303 1888 where: F is
2,2,4,4-Tetramethyl-1,3-cyclobutanediol (65/35 Trans/Cis)
Example 13
[0315] Sheets comprising a polyester that had been prepared with a
target composition of 100 mole % terephthalic acid residues, 80
mole % 1,4-cyclohexanedimethanol residues, and 20 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues were produced
using a 3.5 inch single screw extruder. A sheet was extruded
continuously, gauged to a thickness of 177 mil and then various
sheets were sheared to size. Inherent viscosity and glass
transition temperature were measured on one sheet. The sheet
inherent viscosity was measured to be 0.69 dl/g. The glass
transition temperature of the sheet was measured to be 106.degree.
C. Sheets were then conditioned at 50% relative humidity and
60.degree. C. for 2 weeks. Sheets were subsequently thermoformed
into a female mold having a draw ratio of 2.5:1 using a Brown
thermoforming machine. The thermoforming oven heaters were set to
70/60/60% output using top heat only. Sheets were left in the oven
for various amounts of time in order to determine the effect of
sheet temperature on the part quality as shown in the table below.
Part quality was determined by measuring the volume of the
thermoformed part, calculating the draw, and visually inspecting
the thermoformed part. The draw was calculated as the part volume
divided by the maximum part volume achieved in this set of
experiments (Example G). The thermoformed part was visually
inspected for any blisters and the degree of blistering rated as
none (N), low (L), or high (H). The results below demonstrate that
these thermoplastic sheets with a glass transition temperature of
106.degree. C. can be thermoformed under the conditions shown
below, as evidenced by these sheets having at least 95% draw and no
blistering, without predrying the sheets prior to thermoforming.
TABLE-US-00028 Thermoforming Conditions Part Quality Sheet Part
Heat Time Temperature Volume Blisters Example (s) (.degree. C.)
(mL) Draw (%) (N, L, H) A 86 145 501 64 N B 100 150 500 63 N C 118
156 672 85 N D 135 163 736 94 N E 143 166 760 97 N F 150 168 740 94
L G 159 172 787 100 L
Example 14
[0316] Sheets comprising a polyester that had been prepared with a
target composition of 100 mole % terephthalic acid residues, 80
mole % 1,4-cyclohexanedimethanol residues, and 20 mole %
2,2,4,4-tetramethyl-1,3-cyclobutanediol residues were produced
using a 3.5 inch single screw. A sheet was extruded continuously,
gauged to a thickness of 177 mil and then various sheets were
sheared to size. Inherent viscosity and glass transition
temperature were measured on one sheet. The sheet inherent
viscosity was measured to be 0.69 dl/g. The glass transition
temperature of the sheet was measured to be 106.degree. C. Sheets
were then conditioned at 100% relative humidity and 25.degree. C.
for 2 weeks. Sheets were subsequently thermoformed into a female
mold having a draw ratio of 2.5:1 using a Brown thermoforming
machine. The thermoforming oven heaters were set to 60/40/40%
output using top heat only. Sheets were left in the oven for
various amounts of time in order to determine the effect of sheet
temperature on the part quality as shown in the table below. Part
quality was determined by measuring the volume of the thermoformed
part, calculating the draw, and visually inspecting the
thermoformed part. The draw was calculated as the part volume
divided by the maximum part volume achieved in this set of
experiments (Example G). The thermoformed part was visually
inspected for any blisters and the degree of blistering rated as
none (N), low (L), or high (H). The results below demonstrate that
these thermoplastic sheets with a glass transition temperature of
106.degree. C. can be thermoformed under the conditions shown
below, as evidenced by the production of sheets having at least 95%
draw and no blistering, without predrying the sheets prior to
thermoforming. TABLE-US-00029 Thermoforming Conditions Part Quality
Sheet Part Heat Time Temperature Volume Blisters Example (s)
(.degree. C.) (mL) Draw (%) (N, L, H) A 141 154 394 53 N B 163 157
606 82 N C 185 160 702 95 N D 195 161 698 95 N E 215 163 699 95 L F
230 168 705 96 L G 274 174 737 100 H H 275 181 726 99 H
Example 15
Comparative Example
[0317] Sheets consisting of Kelvx 201 were produced using a 3.5
inch single screw extruder. Kelvx is a blend consisting of 69.85%
PCTG (Eastar from Eastman Chemical Co. having 100 mole %
terephthalic acid residues, 62 mole % 1,4-cyclohexanedimethanol
residues, and 38 mole % ethylene glycol residues); 30% PC
(bisphenol A polycarbonate); and 0.15% Weston 619 (stabilizer sold
by Crompton Corporation). A sheet was extruded continuously, gauged
to a thickness of 177 mil and then various sheets were sheared to
size. The glass transition temperature was measured on one sheet
and was 100.degree. C. Sheets were then conditioned at 50% relative
humidity and 60.degree. C. for 2 weeks. Sheets were subsequently
thermoformed into a female mold having a draw ratio of 2.5:1 using
a Brown thermoforming machine. The thermoforming oven heaters were
set to 70/60/60% output using top heat only. Sheets were left in
the oven for various amounts of time in order to determine the
effect of sheet temperature on the part quality as shown in the
table below. Part quality was determined by measuring the volume of
the thermoformed part, calculating the draw, and visually
inspecting the thermoformed part. The draw was calculated as the
part volume divided by the maximum part volume achieved in this set
of experiments (Example E). The thermoformed part was visually
inspected for any blisters and the degree of blistering rated as
none (N), low (L), or high (H). The results below demonstrate that
these thermoplastic sheets with a glass transition temperature of
100.degree. C. can be thermoformed under the conditions shown
below, as evidenced by the production of sheets having at least 95%
draw and no blistering, without predrying the sheets prior to
thermoforming. TABLE-US-00030 Thermoforming Conditions Part Quality
Sheet Part Heat Time Temperature Volume Blisters Example (s)
(.degree. C.) (mL) Draw (%) (N, L, H) A 90 146 582 75 N B 101 150
644 83 N C 171 154 763 98 N D 126 159 733 95 N E 126 159 775 100 N
F 141 165 757 98 N G 148 168 760 98 L
Example 16
Comparative Example
[0318] Sheets consisting of Kelvx 201 were produced using a 3.5
inch single screw extruder. A sheet was extruded continuously,
gauged to a thickness of 177 mil and then various sheets were
sheared to size. The glass transition temperature was measured on
one sheet and was 100.degree. C. Sheets were then conditioned at
100% relative humidity and 25.degree. C. for 2 weeks. Sheets were
subsequently thermoformed into a female mold having a draw ratio of
2.5:1 using a Brown thermoforming machine. The thermoforming oven
heaters were set to 60/40/40% output using top heat only. Sheets
were left in the oven for various amounts of time in order to
determine the effect of sheet temperature on the part quality as
shown in the table below. Part quality was determined by measuring
the volume of the thermoformed part, calculating the draw, and
visually inspecting the thermoformed part. The draw was calculated
as the part volume divided by the maximum part volume achieved in
this set of experiments (Example H). The thermoformed part was
visually inspected for any blisters and the degree of blistering
rated as none (N), low (L), or high (H). The results below
demonstrate that these thermoplastic sheets with a glass transition
temperature of 100.degree. C. can be thermoformed under the
conditions shown below, as evidenced by the production of sheets
having greater than 95% draw and no blistering, without predrying
the sheets prior to thermoforming. TABLE-US-00031 Thermoforming
Conditions Part Quality Sheet Part Heat Time Temperature Volume
Blisters Example (s) (.degree. C.) (mL) Draw (%) (N, L, H) A 110
143 185 25 N B 145 149 529 70 N C 170 154 721 95 N D 175 156 725 96
N E 185 157 728 96 N F 206 160 743 98 L G 253 NR 742 98 H H 261 166
756 100 H NR = Not recorded
Example 17
Comparative Example
[0319] Sheets consisting of PCTG 25976 (100 mole % terephthalic
acid residues, 62 mole % 1,4-cyclohexanedimethanol residues, and 38
mole % ethylene glycol residues) were produced using a 3.5 inch
single screw extruder. A sheet was extruded continuously, gauged to
a thickness of 118 mil and then various sheets were sheared to
size. The glass transition temperature was measured on one sheet
and was 87.degree. C. Sheets were then conditioned at 50% relative
humidity and 60.degree. C. for 4 weeks. The moisture level was
measured to be 0.17 wt %. Sheets were subsequently thermoformed
into a female mold having a draw ratio of 2.5:1 using a Brown
thermoforming machine. The thermoforming oven heaters were set to
70/60/60% output using top heat only. Sheets were left in the oven
for various amounts of time in order to determine the effect of
sheet temperature on the part quality as shown in the table below.
Part quality was determined by measuring the volume of the
thermoformed part, calculating the draw, and visually inspecting
the thermoformed part. The draw was calculated as the part volume
divided by the maximum part volume achieved in this set of
experiments (Example A). The thermoformed part was visually
inspected for any blisters and the degree of blistering rated as
none (N), low (L), or high (H). The results below demonstrate that
these thermoplastic sheets with a glass transition temperature of
87.degree. C. can be thermoformed under the conditions shown below,
as evidenced by the production of sheets having greater than 95%
draw and no blistering, without predrying the sheets prior to
thermoforming. TABLE-US-00032 Thermoforming Conditions Part Quality
Sheet Part Heat Time Temperature Volume Blisters Example (s)
(.degree. C.) (mL) Draw (%) (N, L, H) A 102 183 816 100 N B 92 171
811 99 N C 77 160 805 99 N D 68 149 804 99 N E 55 143 790 97 N F 57
138 697 85 N
Example 18
Comparative Example
[0320] A miscible blend consisting of 20 wt % Teijin L-1250
polycarbonate (a bisphenol-A polycarbonate), 79.85 wt % PCTG 25976,
and 0.15 wt % Weston 619 was produced using a 1.25 inch single
screw extruder. Sheets consisting of the blend were then produced
using a 3.5 inch single screw extruder. A sheet was extruded
continuously, gauged to a thickness of 118 mil and then various
sheets were sheared to size. The glass transition temperature was
measured on one sheet and was 94.degree. C. Sheets were then
conditioned at 50% relative humidity and 60.degree. C. for 4 weeks.
The moisture level was measured to be 0.25 wt %. Sheets were
subsequently thermoformed into a female mold having a draw ratio of
2.5:1 using a Brown thermoforming machine. The thermoforming oven
heaters were set to 70/60/60% output using top heat only. Sheets
were left in the oven for various amounts of time in order to
determine the effect of sheet temperature on the part quality as
shown in the table below. Part quality was determined by measuring
the volume of the thermoformed part, calculating the draw, and
visually inspecting the thermoformed part. The draw was calculated
as the part volume divided by the maximum part volume achieved in
this set of experiments (Example A). The thermoformed part was
visually inspected for any blisters and the degree of blistering
rated as none (N), low (L), or high (H). The results below
demonstrate that these thermoplastic sheets with a glass transition
temperature of 94.degree. C. can be thermoformed under the
conditions shown below, as evidenced by the production of sheets
having greater than 95% draw and no blistering, without predrying
the sheets prior to thermoforming. TABLE-US-00033 Thermoforming
Conditions Part Quality Sheet Part Heat Time Temperature Volume
Blisters Example (s) (.degree. C.) (mL) Draw (%) (N, L, H) A 92 184
844 100 H B 86 171 838 99 N C 73 160 834 99 N D 58 143 787 93 N E
55 143 665 79 N
Example 19
Comparative Example
[0321] A miscible blend consisting of 30 wt % Teijin L-1250
polycarbonate, 69.85 wt % PCTG 25976, and 0.15 wt % Weston 619 was
produced using a 1.25 inch single screw extruder. Sheets consisting
of the blend were then produced using a 3.5 inch single screw
extruder. A sheet was extruded continuously, gauged to a thickness
of 118 mil and then various sheets were sheared to size. The glass
transition temperature was measured on one sheet and was 99.degree.
C. Sheets were then conditioned at 50% relative humidity and
60.degree. C. for 4 weeks. The moisture level was measured to be
0.25 wt %. Sheets were subsequently thermoformed into a female mold
having a draw ratio of 2.5:1 using a Brown thermoforming machine.
The thermoforming oven heaters were set to 70/60/60% output using
top heat only. Sheets were left in the oven for various amounts of
time in order to determine the effect of sheet temperature on the
part quality as shown in the table below. Part quality was
determined by measuring the volume of the thermoformed part,
calculating the draw, and visually inspecting the thermoformed
part. The draw was calculated as the part volume divided by the
maximum part volume achieved in this set of experiments (Example
A). The thermoformed part was visually inspected for any blisters
and the degree of blistering rated as none (N), low (L), or high
(H). The results below demonstrate that these thermoplastic sheets
with a glass transition temperature of 99.degree. C. can be
thermoformed under the conditions shown below, as evidenced by the
production of sheets having greater than 95% draw and no
blistering, without predrying the sheets prior to thermoforming.
TABLE-US-00034 Thermoforming Conditions Part Quality Sheet Part
Heat Time Temperature Volume Blisters Example (s) (.degree. C.)
(mL) Draw (%) (N, L, H) A 128 194 854 100 H B 98 182 831 97 L C 79
160 821 96 N D 71 149 819 96 N E 55 145 785 92 N F 46 143 0 0 NA G
36 132 0 0 NA NA = not applicable. A value of zero indicates that
the sheet was not formed because it did not pull into the mold
(likely because it was too cold).
Example 20
Comparative Example
[0322] A miscible blend consisting of 40 wt % Teijin L-1250
polycarbonate, 59.85 wt % PCTG 25976, and 0.15 wt % Weston 619 was
produced using a 1.25 inch single screw extruder. Sheets consisting
of the blend were then produced using a 3.5 inch single screw
extruder. A sheet was extruded continuously, gauged to a thickness
of 118 mil and then various sheets were sheared to size. The glass
transition temperature was measured on one sheet and was
105.degree. C. Sheets were then conditioned at 50% relative
humidity and 60.degree. C. for 4 weeks. The moisture level was
measured to be 0.265 wt %. Sheets were subsequently thermoformed
into a female mold having a draw ratio of 2.5:1 using a Brown
thermoforming machine. The thermoforming oven heaters were set to
70/60/60% output using top heat only. Sheets were left in the oven
for various amounts of time in order to determine the effect of
sheet temperature on the part quality as shown in the table below.
Part quality was determined by measuring the volume of the
thermoformed part, calculating the draw, and visually inspecting
the thermoformed part. The draw was calculated as the part volume
divided by the maximum part volume achieved in this set of
experiments (Examples 8A to 8E). The thermoformed part was visually
inspected for any blisters and the degree of blistering rated as
none (N), low (L), or high (H). The results below demonstrate that
these thermoplastic sheets with a glass transition temperature of
105.degree. C. can be thermoformed under the conditions shown
below, as evidenced by the production of sheets having greater than
95% draw and no blistering, without predrying the sheets prior to
thermoforming. TABLE-US-00035 Thermoforming Conditions Part Quality
Sheet Part Heat Time Temperature Volume Blisters Example (s)
(.degree. C.) (mL) Draw (%) (N, L, H) A 111 191 828 100 H B 104 182
828 100 H C 99 179 827 100 N D 97 177 827 100 N E 78 160 826 100 N
F 68 149 759 92 N G 65 143 606 73 N
Example 21
Comparative Example
[0323] A miscible blend consisting of 50 wt % Teijin L-1250
polycarbonate, 49.85 wt % PCTG 25976, and 0.15 wt % Weston 619 was
produced using a 1.25 inch single screw extruder. A sheet was
extruded continuously, gauged to a thickness of 118 mil and then
various sheets were sheared to size. The glass transition
temperature was measured on one sheet and was 111.degree. C. Sheets
were then conditioned at 50% relative humidity and 60.degree. C.
for 4 weeks. The moisture level was measured to be 0.225 wt %.
Sheets were subsequently thermoformed into a female mold having a
draw ratio of 2.5:1 using a Brown thermoforming machine. The
thermoforming oven heaters were set to 70/60/60% output using top
heat only. Sheets were left in the oven for various amounts of time
in order to determine the effect of sheet temperature on the part
quality as shown in the table below. Part quality was determined by
measuring the volume of the thermoformed part, calculating the
draw, and visually inspecting the thermoformed part. The draw was
calculated as the part volume divided by the maximum part volume
achieved in this set of experiments (Examples A to D). The
thermoformed part was visually inspected for any blisters and the
degree of blistering rated as none (N), low (L), or high (H). The
results below demonstrate that these thermoplastic sheets with a
glass transition temperature of 111.degree. C. can be thermoformed
under the conditions shown below, as evidenced by the production of
sheets having greater than 95% draw and no blistering, without
predrying the sheets prior to thermoforming. TABLE-US-00036
Thermoforming Conditions Part Quality Sheet Part Heat Time
Temperature Volume Blisters Example (s) (.degree. C.) (mL) Draw (%)
(N, L, H) A 118 192 815 100 H B 99 182 815 100 H C 97 177 814 100 L
D 87 171 813 100 N E 80 160 802 98 N F 64 154 739 91 N G 60 149 0 0
NA NA = not applicable. A value of zero indicates that the sheet
was not formed because it did not pull into the mold (likely
because it was too cold).
Example 22
Comparative Example
[0324] A miscible blend consisting of 60 wt % Teijin L-1250
polycarbonate, 39.85 wt % PCTG 25976, and 0.15 wt % Weston 619 was
produced using a 1.25 inch single screw extruder. Sheets consisting
of the blend were then produced using a 3.5 inch single screw
extruder. A sheet was extruded continuously, gauged to a thickness
of 118 mil and then various sheets were sheared to size. The glass
transition temperature was measured on one sheet and was
117.degree. C. Sheets were then conditioned at 50% relative
humidity and 60.degree. C. for 4 weeks. The moisture level was
measured to be 0.215 wt %. Sheets were subsequently thermoformed
into a female mold having a draw ratio of 2.5:1 using a Brown
thermoforming machine. The thermoforming oven heaters were set to
70/60/60% output using top heat only. Sheets were left in the oven
for various amounts of time in order to determine the effect of
sheet temperature on the part quality as shown in the table below.
Part quality was determined by measuring the volume of the
thermoformed part, calculating the draw, and visually inspecting
the thermoformed part. The draw was calculated as the part volume
divided by the maximum part volume achieved in this set of
experiments (Example A). The thermoformed part was visually
inspected for any blisters and the degree of blistering rated as
none (N), low (L), or high (H). The results below demonstrate that
these thermoplastic sheets with a glass transition temperature of
117.degree. C. cannot be thermoformed under the conditions shown
below, as evidenced by the inability to produce sheets having
greater than 95% draw and no blistering, without predrying the
sheets prior to thermoforming. TABLE-US-00037 Thermoforming
Conditions Part Quality Sheet Part Heat Time Temperature Volume
Blisters Example (s) (.degree. C.) (mL) Draw (%) (N, L, H) A 114
196 813 100 H B 100 182 804 99 H C 99 177 801 98 L D 92 171 784 96
L E 82 168 727 89 L F 87 166 597 73 N
Example 23
Comparative Example
[0325] A miscible blend consisting of 65 wt % Teijin L-1250
polycarbonate, 34.85 wt % PCTG 25976, and 0.15 wt % Weston 619 was
produced using a 1.25 inch single screw extruder. Sheets consisting
of the blend were then produced using a 3.5 inch single screw
extruder. A sheet was extruded continuously, gauged to a thickness
of 118 mil and then various sheets were sheared to size. The glass
transition temperature was measured on one sheet and was
120.degree. C. Sheets were then conditioned at 50% relative
humidity and 60.degree. C. for 4 weeks. The moisture level was
measured to be 0.23 wt %. Sheets were subsequently thermoformed
into a female mold having a draw ratio of 2.5:1 using a Brown
thermoforming machine. The thermoforming oven heaters were set to
70/60/60% output using top heat only. Sheets were left in the oven
for various amounts of time in order to determine the effect of
sheet temperature on the part quality as shown in the table below.
Part quality was determined by measuring the volume of the
thermoformed part, calculating the draw, and visually inspecting
the thermoformed part. The draw was calculated as the part volume
divided by the maximum part volume achieved in this set of
experiments (Example A). The thermoformed part was visually
inspected for any blisters and the degree of blistering rated as
none (N), low (L), or high (H). The results below demonstrate that
these thermoplastic sheets with a glass transition temperature of
120.degree. C. cannot be thermoformed under the conditions shown
below, as evidenced by the inability to produce sheets having
greater than 95% draw and no blistering, without predrying the
sheets prior to thermoforming. TABLE-US-00038 Thermoforming
Conditions Part Quality Sheet Part Heat Time Temperature Volume
Blisters Example (s) (.degree. C.) (mL) Draw (%) (N, L, H) A 120
197 825 100 H B 101 177 820 99 H C 95 174 781 95 L D 85 171 727 88
L E 83 166 558 68 L
Example 24
Comparative Example
[0326] A miscible blend consisting of 70 wt % Teijin L-1250
polycarbonate, 29.85 wt % PCTG 25976, and 0.15 wt % Weston 619 was
produced using a 1.25 inch single screw extruder. Sheets consisting
of the blend were then produced using a 3.5 inch single screw
extruder. A sheet was extruded continuously, gauged to a thickness
of 118 mil and then various sheets were sheared to size. The glass
transition temperature was measured on one sheet and was
123.degree. C. Sheets were then conditioned at 50% relative
humidity and 60.degree. C. for 4 weeks. The moisture level was
measured to be 0.205 wt %. Sheets were subsequently thermoformed
into a female mold having a draw ratio of 2.5:1 using a Brown
thermoforming machine. The thermoforming oven heaters were set to
70/60/60% output using top heat only. Sheets were left in the oven
for various amounts of time in order to determine the effect of
sheet temperature on the part quality as shown in the table below.
Part quality was determined by measuring the volume of the
thermoformed part, calculating the draw, and visually inspecting
the thermoformed part. The draw was calculated as the part volume
divided by the maximum part volume achieved in this set of
experiments (Examples A and B). The thermoformed part was visually
inspected for any blisters and the degree of blistering rated as
none (N), low (L), or high (H). The results below demonstrate that
these thermoplastic sheets with a glass transition temperature of
123.degree. C. cannot be thermoformed under the conditions shown
below, as evidenced by the inability to produce sheets having
greater than 95% draw and no blistering, without predrying the
sheets prior to thermoforming. TABLE-US-00039 Thermoforming
Conditions Part Quality Sheet Part Heat Time Temperature Volume
Blisters Example (s) (.degree. C.) (mL) Draw (%) (N, L, H) A 126
198 826 100 H B 111 188 822 100 H C 97 177 787 95 L D 74 166 161 19
L E 58 154 0 0 NA F 48 149 0 0 NA NA = not applicable. A value of
zero indicates that the sheet was not formed because it did not
pull into the mold (likely because it was too cold).
Example 25
Comparative Example
[0327] Sheets consisting of Teijin L-1250 polycarbonate were
produced using a 3.5 inch single screw extruder. A sheet was
extruded continuously, gauged to a thickness of 118 mil and then
various sheets were sheared to size. The glass transition
temperature was measured on one sheet and was 149.degree. C. Sheets
were then conditioned at 50% relative humidity and 60.degree. C.
for 4 weeks. The moisture level was measured to be 0.16 wt %.
Sheets were subsequently thermoformed into a female mold having a
draw ratio of 2.5:1 using a Brown thermoforming machine. The
thermoforming oven heaters were set to 70/60/60% output using top
heat only. Sheets were left in the oven for various amounts of time
in order to determine the effect of sheet temperature on the part
quality as shown in the table below. Part quality was determined by
measuring the volume of the thermoformed part, calculating the draw
and visually inspecting the thermoformed part. The draw was
calculated as the part volume divided by the maximum part volume
achieved in this set of experiments (Example A). The thermoformed
part was visually inspected for any blisters and the degree of
blistering rated as none (N), low (L), or high (H). The results
below demonstrate that these thermoplastic sheets with a glass
transition temperature of 149.degree. C. cannot be thermoformed
under the conditions shown below, as evidenced by the inability to
produce sheets having greater than 95% draw and no blistering,
without predrying the sheets prior to thermoforming. TABLE-US-00040
Thermoforming Conditions Part Quality Sheet Part Heat Time
Temperature Volume Blisters Example (s) (.degree. C.) (mL) Draw (%)
(N, L, H) A 152 216 820 100 H B 123 193 805 98 H C 113 191 179 22 H
D 106 188 0 0 H E 95 182 0 0 NA F 90 171 0 0 NA NA = not
applicable. A value of zero indicates that the sheet was not formed
because it did not pull into the mold (likely because it was too
cold).
[0328] It can be clearly seen from a comparison of the data in the
above relevant working examples that the polyesters of the present
invention offer a definite advantage over the commercially
available polyesters with regard to glass transition temperature,
density, slow crystallization rate, melt viscosity, and
toughness.
[0329] The invention has been described in detail with reference to
the embodiments disclosed herein, but it will be understood that
variations and modifications can be effected within the spirit and
scope of the invention.
* * * * *