U.S. patent application number 09/768286 was filed with the patent office on 2002-03-28 for free-flowing transparent polyamide molding composition.
This patent application is currently assigned to Degussa-Huels Aktiengesellschaft. Invention is credited to Haeger, Harald, Hauck, Hans-Peter, Maul, Juergen, Oenbrink, Georg, Richter, Ralf.
Application Number | 20020037972 09/768286 |
Document ID | / |
Family ID | 7628567 |
Filed Date | 2002-03-28 |
United States Patent
Application |
20020037972 |
Kind Code |
A1 |
Maul, Juergen ; et
al. |
March 28, 2002 |
Free-flowing transparent polyamide molding composition
Abstract
Transparent molding compositions are prepared by blending from
50 to 99 parts by weight of a transparent polyamide, and from 1 to
50 parts by weight of a graft copolymer, such that the sum of the
parts by weight of the transparent polyamide and the graft
copolymer is 100. The graft copolymer is prepared by reacting from
0.5 to 25% by weight, based on the graft copolymer, of a branched
polyamine having at least 4 nitrogen atoms and having a number
average molecular weight M.sub.n of at least 146 g/mol, with
polyamide-forming monomers selected from the group consisting of
lactams, w-aminocarboxylic acids, equimolar combinations of diamine
and dicarboxylic acid, and combinations thereof.
Inventors: |
Maul, Juergen; (Marl,
DE) ; Oenbrink, Georg; (Duelmen, DE) ; Haeger,
Harald; (Marl, DE) ; Hauck, Hans-Peter;
(Recklinghausen, DE) ; Richter, Ralf;
(Recklinghausen, DE) |
Correspondence
Address: |
OBLON SPIVAK MCCLELLAND MAIER & NEUSTADT PC
FOURTH FLOOR
1755 JEFFERSON DAVIS HIGHWAY
ARLINGTON
VA
22202
US
|
Assignee: |
Degussa-Huels
Aktiengesellschaft
Frankfurt
DE
|
Family ID: |
7628567 |
Appl. No.: |
09/768286 |
Filed: |
January 25, 2001 |
Current U.S.
Class: |
525/419 |
Current CPC
Class: |
C08L 77/00 20130101;
C08L 77/00 20130101; C08L 77/00 20130101 |
Class at
Publication: |
525/419 |
International
Class: |
C08G 063/91 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 25, 2000 |
DE |
10002948.5 |
Claims
What is claimed as new and is intended to be secured by Letters
Patent is:
1. A molding composition which comprises the following components:
I) from 50 to 99 parts by weight of a transparent polyamide, and
II) from 1 to 50 parts by weight of a graft copolymer prepared
using the following monomers: a) from 0.5 to 25% by weight, based
on the graft copolymer, of a branched polyamine having at least 4
nitrogen atoms and having a number average molecular weight M.sub.n
of at least 146 g/mol, and b) polyamide-forming monomers selected
from the group consisting of lactams, .omega.-aminocarboxylic
acids, equimolar combinations of diamine and dicarboxylic acid, and
combinations thereof, where the sum of the parts by weight of ) and
II) is 100.
2. The molding composition of claim 1, which comprises I) from 75
to 98 parts by weight of the transparent polyamide and II) from 2
to 25 parts by weight of the graft copolymer.
3. The molding composition of claim 1, which comprises I) from 85
to 97 parts by weight of the transparent polyamide and II) from 3
to 15 parts by weight of the graft copolymer.
4. The molding composition of claim 1, wherein the graft copolymer
is prepared from monomers comprising 1 to 20% by weight of a
branched polyamine.
5. The molding composition of claim 1, wherein the graft copolymer
is prepared from monomers comprising 1.5 to 16% by weight of a
branched polyamine.
6. The molding composition of claim 1, wherein the branched
polyamine has at least 8 nitrogen atoms.
7. The molding composition of claim 1, wherein the branched
polyamine has at least 11 nitrogen atoms.
8. The molding composition of claim 1, wherein the branched
polyamine has a number average molecular weight of at least 500
g/mol.
9. The molding composition of claim 1, wherein the transparent
polyamide is selected from the group consisting of: the copolyamide
made from terephthalic acid and the isomer mixture of 2,2,4-and
2,4,4-trimethylhexamethylenediamine, the polyamide made from
isophthalic acid and 1,6-hexamethylenediamine, the copolyamide made
from a mixture of terephthalic acid/isophthalic acid and
1,6-hexamethylenediamine, the copolyamide made from isophthalic
acid, 3,3'-dimethyl-4,4'-diaminodicyclo- hexylmethane and
laurolactam, the copolyamide made from isophthalic acid,
3,3'-dimethyl-4,4'-diaminodicyclohexylmethane and caprolactam, the
polyamide made from 1,12-dodecanedioic acid and
3,3'-dimethyl-4,4'-diamin- odicyclohexyhnethane, the copolyamide
made from 1,12-dodecanedioic acid,
3,3'-dimethyl-4,4'-diaminodicyclohexylmethane and laurolactam, the
copolyamide made from 1,12-dodecanedioic acid,
3,3-dimethyl-4,4'-diaminod- icyclohexylmethane and caprolactam, the
copolyamide made from 1,12-dodecanedioic acid,
3,3-dimethyl-4,4'-diaminodicyclohexylmethane and laurolactam and
caprolactam, the copolyamide made from isophthalic acid,
4,4'-diaminodicyclohexylmethane and laurolactam, the copolyamide
made from isophthalic acid, 4,4'-diaminodicyclohexylmethane and
caprolactam, the polyamide made from 1,12-dodecanedioic acid and
4,4'-diaminodicyclohexylmethane, the copolyamide made from a
terephthalic acid/isophthalic acid mixture,
3,3'-dimethyl-4,4'-diaminodicyclohexylmeth- ane and
laurolactarn.
10. The molding composition of claim 1, wherein the polyamine is
selected from the group consisting of dendrimers and branched
polyethyleneimines.
11. The molding composition of claim 1, wherein the graft copolymer
additionally contains an oligocarboxylic acid selected from 0.015
to 3 mol % of a dicarboxylic acid and 0.01 to 1.2 mol % of a
tricarboxylic acid, in each case based on the amount of the
polyamide-forming monomers.
12. The molding composition of claim 1, wherein the graft copolymer
additionally contains a regulator comprising a monocarboxylic acid
having 3 to 50 carbon atoms.
13. A molding produced from the molding composition of claim 1.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention relates to free-flowing transparent polyamide
molding compositions having substantially unimpaired mechanical
properties.
[0003] 2. Discussion of the Background
[0004] Transparent copolyamides are generally distinguished over
other materials by good low-temperature impact strength and good
chemical resistance; in addition, they have high light transparency
together with an amorphous structure, which provides good shrinkage
behavior. Such materials can be used to produce molded articles
having superior properties. However, transparent polyamide
compositions have a high melt viscosity, which makes processing
them considerably more difficult than other types of molding
compositions. For example, thin-walled injection-molded articles
can be produced from transparent copolyamides only with
difficulty.
[0005] Plastics can usually be rendered more free-flowing by
lowering the number average molecular weight. However, this
generally also results in a significant impairment of the
mechanical properties. In the case of polyamides, the impact
strength in particular is drastically reduced by lowering the
number average molecular weight of the polymer below a critical
value.
[0006] Another way of improving the flow behavior of plastics is to
add so-called flow improvers. Low molecular weight additives are
frequently employed for this purpose. In the case of transparent
plastics, however, additives of this type frequently result in a
loss in transparency or in the formation of deposits in the mold
during processing.
[0007] CA-A 2,039,136 describes amorphous polyamides having
improved flow behavior which are obtained by adding certain types
of carbon black to the polyamides. DE-A 3728 334 describes the
improvement in the flow of amorphous polyamides by addition of
polyolefins grafted with maleic anhydride. A. Siegmann et al.
(Polymer, 1985, 26(9), 1325-1330) were able to reduce the melt
viscosity of amorphous polyamides by the addition of liquid
crystalline polyesters. In all of these cases however, the
additives destroy the transparency of the amorphous polyamides.
[0008] C. F. Frihart et al. (Plast. Copd. 1990, 13(3), 109-110)
were able to reduce the melt viscosity of an amorphous polyamide by
adding at least 1% by weight of an additional amorphous polyamide
based on a dimeric fatty acid (C.sub.36-dicarboxylic acid).
However, this procedure results in a significant reduction in the
modulus of elasticity of the blend.
[0009] U.S. Pat. No. 3,442,975 suggests that a polyethyleneimine-PA
6 graft copolymer can be used as flow aid for PA 6. However, this
is a crystalline, opaque polyamide, and the mixture of
polyethyleneimine-PA 6 graft copolymer with PA 6 is also
opaque.
SUMMARY OF THE INVENTION
[0010] The object of the present invention is to develop
free-flowing transparent polyamide molding compositions which do
not have the above-mentioned disadvantages of the prior art, and
whose mechanical properties, in particular tensile strength,
modulus of elasticity, flexural strength and impact strength, are
only slightly impaired compared to the unmodified transparent
polyamides. This is achieved by blending the transparent polyamide
with a graft copolymer formed from a branched polyarnine and
polyamide-forming monomers.
DETAILED DESCRIPTION OF THE INVENTION
[0011] The molding composition of the present invention comprises
the following components:
[0012] I) from 50 to 99 parts by weight, preferably from 75 to 98
parts by weight and particularly preferably from 85 to 97 parts by
weight, of a transparent polyamide, and
[0013] II) from 1 to 50 parts by weight, preferably from 2 to 25
parts by weight and particularly preferably from 3 to 15 parts by
weight, of a graft copolymer prepared from the following
monomers:
[0014] a) from 0.5 to 25% by weight, preferably from 1 to 20% by
weight and particularly preferably from 1.5 to 16% by weight, based
on the graft copolymer, of a branched polyamine having at least 4,
preferably at least 8 and particularly preferably at least 11
nitrogen atoms and having a number average molecular weight Mn of
at least 146 g/mol and preferably of at least 500 g/mol, and
[0015] b) polyamide-forming monomers selected from lactams,
.omega.-aminocarboxylic acids and/or equivalent combinations of
diamine and dicarboxylic acid,
[0016] where the sum of the parts by weight of I) and II) is
100.
[0017] Transparent polyamides are known (Kunststoffhandbuch
[Plastics Handbook] 3/4, Editors G. W. Becker and G. Braun, pp. 803
ff., Carl Hanser Verlag Munich, Vienna, 1998). Transparent
polyamides which are suitable for the purposes of the invention are
also described, for example, in the following publications: U.S.
Pat. No. 2,742,496, CH-B-480 381, CH-B-679 861, DE-A-22 25 938,
DE-A-26 42 244, DE-A-27 43 515, DE-A-29 36 759, DE-A-27 32 928,
DE-A-43 10 970, EP-A-0 053 876, EP-A-0 271 308, EP-A-0 313 436,
EP-A-0 725 100 and EP-A-0 725 101.
[0018] The transparent polyamides used in accordance with the
present invention, which can also be in the form of copolyamides,
are prepared, for example, from the following monomers:
[0019] branched or unbranched aliphatic diamines having 6 to 14
carbon atoms, for example, 1,6-hexamethylenediamine,
2-methyl-1,5-diaminopentane- , 2,2,4- or
2,4,4-trimethylhexamethylenediamine, 1,9-nonamethylenediamine,
1,10-decamethylenediamine or 1,12-dodecamethylenediamine;
[0020] cycloaliphatic diamines having 6 to 22 carbon atoms, for
example, 4,4'-diaminodicyclohexylmethane,
3,3'-dimethyl-4,4'-diaminodicyclohexylme- thane,
4,4'-diaminodicyclohexylpropane, 1,4-diaminocyclohexane,
1,4-bis(aminomethyl)cyclohexane, 2,6-bis(aminomethyl)norbornane or
3-aminomethyl-3,5,5-trimethylcyclohexylamine;
[0021] araliphatic diamines having 8 to 22 carbon atoms, for
example, m- or p-xylylenediamine or bis(4-aminophenyl)propane;
[0022] branched or unbranched aliphatic dicarboxylic acids having 6
to 22 carbon atoms, for example, adipic acid, 2,2,4- or
2,4,4-trimethyladipic acid, azelaic acid, sebacic acid or
1,12-dodecanedioic acid;
[0023] cycloalipbatic dicarboxylic acids having 6 to 22 carbon
atoms, for example, cyclohexane-1,4-dicarboxylic acid,
4,4'-dicarboxydicyclohexylmet- hane,
3,3'-dimethyl-4,4'-dicarboxydicyclohexylmethane,
4,4'-dicarboxydicyclohexylpropane and
1,4-bis(carboxymethyl)cyclohexane;
[0024] araliphatic dicarboxylic acids having 8 to 22 carbon atoms,
for example, 4,4'-diphenylmethanedicarboxylic acid;
[0025] aromatic dicarboxylic acids having 8 to 22 carbon atoms, for
example isophthalic acid, tributylisophthalic acid, terephthalic
acid, 1,4-, 1,5-, 2,6- or 2,7-naphthalenedicarboxylic acid,
diphenic acid or 4,4'-oxybis(benzoic acid),
[0026] lactams having 6 to 12 carbon atoms or the corresponding
aminocarboxylic acids, such as, for example, 6-caprolactam,
6-aminocaproic acid, caprylolactam, .omega.-aminocaprylic acid,
-aminoundecanoic acid, laurolactam or .omega.-aminododecanoic
acid.
[0027] Examples of transparent polyamides which can be used in
accordance with the invention are as follows:
[0028] the copolyamide made from terephthalic acid and the isomer
mixture of 2,2,4- and 2,4,4-trimethylhexamethylenediamine,
[0029] the polyamide made from isophthalic acid and
1,6-hexamethylenediamine,
[0030] the copolyamide made from a mixture of terephthalic
acid/isophthalic acid and 1,6-hexamethylenediamine,
[0031] the copolyamide made from isophthalic acid,
3,3'-dimethyl-4,4'-diam- inodicyclohexylmethane and laurolactam or
caprolactam,
[0032] the polyamide or copolyamide made from 1,12-dodecanedioic
acid, 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane and, if
desired, laurolactam or caprolactam,
[0033] the copolyamide made from isophthalic acid,
4,4'-diaminodicyclohexy- lmethane and laurolactam or
caprolactam,
[0034] the polyamide made from 1,12-dodecanedioic acid and
4,4'-diaminodicyclohexylmethane,
[0035] the copolyamide made from a terephthalic acid/isophthalic
acid mixture, 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane and
laurolactam.
[0036] The branched polyamine can be, for example, any of the
following classes of polyamines:
[0037] dendrimers, for example,
[0038]
((H.sub.2N--(CH.sub.2).sub.3).sub.2N--(CH.sub.2).sub.3).sub.2--N(CH-
.sub.2).sub.2-N((CH.sub.2).sub.2-N((CH.sub.2).sub.3-NH.sub.2).sub.2).sub.2
(DE-A-196 54179) or tris(2-aminoethyl)amine, N,
N-bis(2-aminoethyl)-N,N'--
bis{2-{bis(2-aminoethyl)amino}ethyl}-1,2-ethanediamine or
[0039]
3,15-bis(2-aminoethyl)-6,12-bis{2-{bis{2-aminoethyl)amino}ethyl}-9--
{2{bis{2-bis(2-aminoethyl)amino}ethyl}amino}ethyl}-3,6,9,12,15-pentaazahep-
tadecane-1,17-diamine (J. M. Warakomski, Chem. Mat. 1992, 4,
1000-1004);
[0040] branched polyethyleneimines, which are obtainable by
polymerization of aziridines (Houben-Weyl, Methoden der Organischen
Chemie {Methods of Organic Chemistry}, Volume E20, pages 1482-1487,
Georg Thieme Verlag Stuttgart, 1987) and which generally have the
following amino group distribution:
[0041] from 25 to 46% of primary amino groups,
[0042] from 30 to 45% of secondary amino groups and
[0043] from 16 to 40% of tertiary amino groups.
[0044] In the preferred case, the polyamine has a number average
molecular weight M.sub.n of at most 20,000 g/mol, particularly
preferably of at most 10,000 g/mol and particularly preferably of
at most 5000 g/mol.
[0045] The polyamide-forming monomers employed can be any of the
monomers mentioned above for the transparent polyamide, in
particular lactams and/or .omega.-aminocarboxylic acids. Particular
preference is given to .epsilon.-caprolactam,
.omega.-aminoundecanoic acid and/or laurolactam, the latter
primarily if the transparent polyamide comprises a substantial
proportion of copolymerized laurolactam. However, it is also
possible to employ an equivalent combination of diamine and
dicarboxylic acid, if desired, together with a lactam and/or an
.omega.-aminocarboxylic acid.
[0046] In one possible embodiment, the graft copolymer may be
prepared with the additional use of an oligocarboxylic acid
selected from 0.015 to about 3 mol % of dicarboxylic acid and 0.01
to about 1.2 mol % of tricarboxylic acid, in each case based on the
sum of the moles of the other polyamide-forming monomers. In this
connection, each monomer in the combination of diamine and
dicarboxylic acid is considered individually.
[0047] If a dicarboxylic acid is used, the amount added to the
graft copolymer is preferably from 0.03 to 2.2 mol %, particularly
preferably from 0.05 to 1.5 mol %, very particularly preferably
from 0.1 to 1 mol % and in particular from 0.15 to 0.65 mol %. If a
tricarboxylic acid is used, the amount added to the graft copolymer
is preferably from 0.02 to 0.9 mol %, particularly preferably from
0.025 to 0.6 mol %, very particularly preferably from 0.03 to 0.4
mol % and in particular from 0.04 to 0.25 mol %. The concomitant
use of the oligocarboxylic acid significantly improves the solvent
and hydrolysis resistance of the graft copolymer.
[0048] The oligocarboxylic acid employed can be any desired di- or
tricarboxylic acid having 6 to 24 carbon atoms, for example adipic
acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid,
isophthalic acid, 2,6-naphthalenedicarboxylic acid,
cyclohexane-1,4-dicarboxylic acid, trimesic acid and/or trimellitic
acid.
[0049] In addition, if desired, aliphatic, alicyclic, aromatic,
aralkyl- and/or alkylaryl-substituted monocarboxylic acids having 3
to 50 carbon atoms, such as, for example, lauric acid, unsaturated
fatty acids, acrylic acid or benzoic acid, can be employed as a
regulator. By means of these regulators, the concentration of amino
groups can be reduced without changing the shape of the
molecule.
[0050] The graft copolymers according to the invention can be
prepared by various processes. One possibility is to initially
introduce the lactam or .omega.-aminocarboxylic acid and polyamine
together and to carry out the polymerization or polycondensation.
The oligocarboxylic acid can be added either at the beginning or
during the reaction. However, a preferred two-step process
comprises first carrying out the lactam cleavage and
prepolymerization in the presence of water (alternatively, the
corresponding .omega.-aminocarboxylic acids or diamines and
dicarboxylic acids are employed and prepolymerized directly). In
the second step, the polyamine is added, while any oligocarboxylic
acid used concomitantly is metered in before, during or after the
prepolymerization. The mixture is then held under reduced pressure
at temperatures of from 200 to 290.degree. C. and polycondensed in
a stream of nitrogen or under reduced pressure.
[0051] A further preferred process comprises the hydrolytic
degradation of a polyamide to a prepolymer and the simultaneous or
subsequent reaction with the polyamine. Preference is given to
polyamides in which the end group difference is approximately zero
or in which any oligocarboxylic acid used concomitantly has already
been copolycondensed. However, the oligocarboxylic acid can also be
added at the beginning or during the degradation reaction.
[0052] These processes allow the preparation of ultra-highly
branched polyamides having acid numbers of less than 40 mmol/kg,
preferably less than 20 mmol/kg and particularly preferably less
than 10 mmol/kg. After a reaction time of only from one to five
hours at temperatures of from 200.degree. C. to 290.degree. C.,
approximately complete conversion is achieved.
[0053] If desired, this can be followed, in a further process step,
by holding the graft copolymer thus formed under vacuum for a
number of hours. Fir example, this step may last at least four
hours, preferably at least six hours and particularly preferably at
least eight hours at a temperature of from 200 to 290.degree. C.
After an induction period of several hours, an increase in the melt
viscosity of the polymer is then observed, which is probably
attributable to a reaction of amino end groups with one another,
together with elimination of ammonia and the formation of
crosslinks.
[0054] If it is not desired to continue the reaction to completion
in the melt, the graft copolymer can also be post-condensed in the
solid phase by conventional methods for polyamides.
[0055] The transparent polyamide and the graft copolymer can be
mixed with one another by any conventional method. For example, the
mixing may be carried out in the melt in a compounding unit.
[0056] The molding composition according to the invention can also
contain conventional auxiliaries and additives used in transparent
polyamides, for example, flame retardants, stabilizers,
plasticizers, glass fibers or other polymers which do not impair
the transparency of the molding composition. The amount of all
additives is in total a maximum of 40 parts by weight, preferably a
maximum of 30 parts by weight and particularly preferably a maximum
of 20 parts by weight.
[0057] Moldings can be produced from the molding composition by any
conventional method, for example by extrusion, blow molding,
thermoforming and, in particular, injection molding. The molding
composition according to the present invention is also excellently
suited for the extrusion coating of any desired surface.
[0058] Having generally described this invention, a further
understanding can be obtained by reference to certain specific
examples which are provided herein for purposes of illustration
only, and are not intended to be limiting unless otherwise
specified.
EXAMPLE 1
Preparation of a polyethyleneimine-PA 6 Graft Copolymer
[0059] 56.58 kg of .epsilon.-caprolactam and 0.094 kg of
dodecanedioic acid were melted at from 180 to 210.degree. C. in a
heated kettle and metered into a pressure-tight polycondensation
reactor. 5% by weight of water and 57 ppm of H.sub.3PO.sub.2 were
then added. The pressure imposed on the mixture was then reduced to
a residual steam pressure of 3 bar over the course of 3 hours, and
5% by weight of polyethyleneimine (Lupasol G100, BASF AG,
Ludwigshafen) were metered in. The polyethyleneimine was
incorporated at the ambient pressure established under these
conditions. The mixture was subsequently decompressed to
atmospheric pressure, and the reaction was continued to completion
over the course of 5 hours at 240.degree. C. while nitrogen was
passed over the mixture. The clear melt was discharged as an
extrudate via a spinning wheel pump, cooled in a water bath and
granulated. The graft copolymer thus formed had the following
properties:
[0060] .eta..sub.rel: 1.23
[0061] Melting point T.sub.m: 209.degree. C.
[0062] The granules were opaque.
EXAMPLE 2
[0063] 95 parts by weight of a transparent polyamide made from 50
mol % of terephthalic acid and 50 mol % of an isomer mixture of
2,2,4- and 2,4,4-trimethylhexamethylenediamine were mixed in the
melt with 5 parts by weight of the graft copolymer prepared in
Example 1, during which the material temperature was held within
the range from 280.degree. C. to 320.degree. C. The product was
extruded and granulated. Transparent standard test specimens were
produced from the granules by injection molding. The results are
shown in Table 1. For comparison, the table also contains the
corresponding data for the unmodified polyamide, which was not
mixed with a graft copolymer.
EXAMPLE 3
[0064] As Example 2, but with 90 parts by weight of the polyamide
and 10 parts by weight of the graft copolymer. Here too,
transparent test specimens were obtained.
[0065] Table 1 shows that the mechanical properties of the molding
compositions according to the invention are at the same level as
those of the unmodified polyamide.
[0066] The priority document of the present application, German
patent application 10002948.5 filed Jan. 25, 2000, is incorporated
herein by reference.
[0067] Obviously, numerous modifications and variations on the
present invention are possible in light of the above teachings. It
is therefore to be understood that within the scope of the appended
claims, the invention may be practiced otherwise than as
specifically described herein.
1TABLE 1 Basic mechanical properties For comparison: transparent
polyamide Property Method Unit Example 2 Example 3 employed Impact
strength (CHARPY) ISO 179/IeU 23.degree. C. kJ/m.sup.2 no break no
break no break -30.degree. C. kJ/m.sup.2 no break 4/10 no break no
break -30.degree. C. kJ/m.sup.2 no break no break no break Notched
impact strength (CHARPY) ISO 179/IeA 23.degree. C. kJ/m.sup.2 10 9
11 0.degree. C. kJ/m.sup.2 9 9 10 -30.degree. C. kJ/m.sup.2 6 6 7
Shore hardness D DIN 53505 87 88 87 Ball impression hardness H 30
ISO 2039 N/mm.sup.2 165 172 178 Tensile test 50 mm/min ISO 527
Yield stress N/mm.sup.2 91 95 88 Elongation % 7 7 8 Tensil strength
N/mm.sup.2 65 63 63 Tensil elongation % >150 >150 >100
Modulus of elasticity (tensile test) DIN 53457-t N/mm.sup.2 3140
3200 2670 Flexural test 5 mm/min ISO 178 Flexural strength
N/mm.sup.2 154 156 155 3.5% flexural stress N/mm.sup.2 100 103 107
Outer fiber strain at flexural strength % 10 9 9 Modulus of
elasticity (flexural test) DIN 53457-B3 N/mm.sup.2 2900 3080 3085
Melt viscosity at 280.degree. C. and a shear rate of 10 [l/s] 100
[l/s] High-pressure capillary [Pas] 4100 2850 8250 rheometry [Pas]
2050 1800 3500
* * * * *