U.S. patent application number 15/768622 was filed with the patent office on 2020-02-06 for ink emulsion composition and water-based ink.
This patent application is currently assigned to NIPPON KAYAKU KABUSHIKI KAISHA. The applicant listed for this patent is NIPPON KAYAKU KABUSHIKI KAISHA. Invention is credited to Hiroko HIGUCHI, Junya MASEKI, Shunta MISAWA, Keijyou SASAKI, Shinsuke SHIMIZU.
Application Number | 20200040202 15/768622 |
Document ID | / |
Family ID | 58630216 |
Filed Date | 2020-02-06 |
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United States Patent
Application |
20200040202 |
Kind Code |
A9 |
SASAKI; Keijyou ; et
al. |
February 6, 2020 |
INK EMULSION COMPOSITION AND WATER-BASED INK
Abstract
Disclosed is an ink emulsion composition that, when used as an
ink composition, retains a high concentration of a colorant and
exhibits good re-dispersibility after drying, and that causes no
change in the physical properties of the ink when stored for a long
period of time. The ink emulsion composition contains: (A) a dye
and/or a pigment; (B) a styrene-(meth)acrylic copolymer; and (C) a
compound in an amount of more than 0.18 mass %, the compound (C)
being represented by formula (1): ##STR00001## where t represents 1
to 5.
Inventors: |
SASAKI; Keijyou;
(Chiyoda-ku, Tokyo, JP) ; SHIMIZU; Shinsuke;
(Chiyoda-ku, Tokyo, JP) ; MISAWA; Shunta;
(Chiyoda-ku, Tokyo, JP) ; MASEKI; Junya;
(Chiyoda-ku, Tokyo, JP) ; HIGUCHI; Hiroko;
(Chiyoda-ku, Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NIPPON KAYAKU KABUSHIKI KAISHA |
Chiyoda-ku, Tokyo |
|
JP |
|
|
Assignee: |
NIPPON KAYAKU KABUSHIKI
KAISHA
Chiyoda-ku, Tokyo
JP
|
Prior
Publication: |
|
Document Identifier |
Publication Date |
|
US 20180305566 A1 |
October 25, 2018 |
|
|
Family ID: |
58630216 |
Appl. No.: |
15/768622 |
Filed: |
October 28, 2016 |
PCT Filed: |
October 28, 2016 |
PCT NO: |
PCT/JP2016/004738 PCKC 00 |
371 Date: |
April 16, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
D06P 5/001 20130101;
C09D 11/033 20130101; B41J 2/01 20130101; C09D 11/38 20130101; B41M
5/00 20130101; D06P 5/30 20130101; C09D 11/328 20130101; D06P 5/00
20130101; C09D 11/107 20130101; C09D 11/322 20130101; C09D 11/32
20130101; C09D 11/023 20130101; C09D 11/037 20130101 |
International
Class: |
C09D 11/023 20060101
C09D011/023; B41J 2/01 20060101 B41J002/01; B41M 5/00 20060101
B41M005/00; C09D 11/38 20060101 C09D011/38; C09D 11/322 20060101
C09D011/322; C09D 11/328 20060101 C09D011/328; C09D 11/037 20060101
C09D011/037; C09D 11/107 20060101 C09D011/107; C09D 11/033 20060101
C09D011/033; D06P 5/00 20060101 D06P005/00; D06P 5/30 20060101
D06P005/30 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 30, 2015 |
JP |
2015-215302 |
Jul 25, 2016 |
JP |
2016-145144 |
Claims
1. An ink emulsion composition comprising: (A) a dye and/or a
pigment; (B) a styrene-(meth)acrylic copolymer; and (C) a compound
in an amount of more than 0.18 mass %, the compound (C) being
represented by formula (1): ##STR00006## where t represents 1 to
5.
2. The ink emulsion composition according to claim 1, wherein the
component (A) is at least one dye selected from a disperse dye, an
oil-soluble dye, or a vat dye.
3. The ink emulsion composition according to claim 1, wherein the
component (A) is at least one dye selected from C.I. Disperse
Yellow 54, C.I. Disperse Orange 25, C.I. Disperse Red 60, C.I.
Disperse Blue 72, 359, 360, C.I. Disperse Brown 26, 27, or C.I.
Solvent Orange 60.
4. The ink emulsion composition according to claim 1, wherein the
component (B) has a weight-average molecular weight of 1000 or more
and 20000 or less.
5. The ink emulsion composition according to claim 1, wherein the
component (B) has a glass transition temperature of 45.degree. C.
or higher and 135.degree. C. or lower.
6. The ink emulsion composition according to claim 1, wherein the
component (B) is a styrene-acrylic copolymer having in its molecule
a skeleton represented by the following formula (2) or (3):
##STR00007## where n.sub.1 to n.sub.3 each represent an integer of
1 to 30, or ##STR00008## where m.sub.1 and m.sub.2 each represent
an integer of 1 to 43.
7. The ink emulsion composition according claim 1, wherein t is 2
in the component (C).
8. The ink emulsion composition according to claim 1, further
comprising: (D) a compound having in its molecule both substituents
of an amino group and a sulfo group.
9. The ink emulsion composition according to claim 8, wherein the
component (D) is a compound represented by formula (4):
H.sub.2N--R--SO.sub.3H (4) where R represents an alkylene group, an
alkylidene group, or an arylene group which may have a
substituent.
10. The ink emulsion composition according to claim 1, further
comprising: (E) a water-soluble organic solvent.
11. The ink emulsion composition according to claim 10, wherein the
component (E) is a water-soluble organic solvent having in its
molecule one or more hydroxy groups.
12. The ink emulsion composition according to claim 1, wherein the
component (A) has a number-average particle size of 10 nm to 500
nm.
13. A method of producing the ink emulsion composition as recited
in claim 1, the method comprising neutralizing and dissolving with
an alkaline aqueous solution.
14. An ink dispersion composition comprising: the ink emulsion
composition as recited in claim 1; and (F) a defoamer.
15. The ink dispersion composition according to claim 14, wherein
the component (F) is a nonionic surfactant.
16. The ink dispersion composition according to claim 14, further
comprising: (G) a preservative.
17. A water-based ink comprising the ink emulsion composition as
recited in claim 1.
18. The water-based ink according to claim 17, further comprising:
(H) a compound represented by formula (5): ##STR00009## where s
represents 1 to 5.
19. A water-based ink comprising the ink dispersion composition as
recited in claim 14.
20. The water-based ink according to claim 19, further comprising:
(H) a compound represented by formula (5): ##STR00010## where s
represents 1 to 5.
Description
TECHNICAL FIELD
[0001] This disclosure relates to a novel ink emulsion composition
having extremely high storage stability and a water-based ink
composition using the same.
BACKGROUND
[0002] As digitalization of information progresses, inkjet printing
has been widely used in office and home printers. In recent years
there have been many applications advanced to commercial printing,
textile printing, and the like. As inkjet printing applications are
expanding, a variety of coloring materials for use in ink
formulations are also being used depending on the applications,
including water-soluble dyes such as conventional acidic dyes and
direct dyes, water-insoluble colorants such as disperse dyes and
pigments, and the like.
[0003] Disperse dyes are widely used for industrial dyeing of
hydrophobic fibers such as polyesters, and they are used for dyeing
by dispersing a water-insoluble dye in a dye bath or color paste.
As the dye infiltrates and diffuses in a dispersed state inside the
fiber under high temperature conditions, dyeing is caused by
hydrogen bonding between fiber dyes, intermolecular force, or the
like. If the dispersibility of the dye, especially the
dispersibility at high temperature is poor, aggregation of the dye
occurs in the high-temperature dyeing bath, causing specks to
easily form (a phenomenon that results from poor dispersion of the
dye during dyeing, in which the dye adheres in a dotted manner to
the fibers, leading to generation of stains in the object to be
dyed). For this reason, conventionally, for fiber dyeing,
dispersants excellent in high temperature dispersibility, for
example, anionic dispersants have been mainly used, such as
formaldehyde condensates of lignosulfonic acid, formaldehyde
condensates of alkylnaphthalenesulfonic acid, and formaldehyde
condensates of creosote oil sulfonic acid.
[0004] Ink jet printing of polyester fibers has also been carried
out using disperse dyes (Journal of the Japan Imaging Society, Vol.
41, No. 2, pp 68 to p 74 (2002) [NPL 1] and Senshoku Keizai
Shimbun, Jan. 28, 2004, pp. 18-21 [NPL 2]) and the following
methods have been mainly used: direct printing in which dye ink is
applied (printed) to fibers and then heat treatment such as
steaming is performed to implement dyeing; and thermal transfer
printing in which dye ink is applied (printed) to a sheet of
special transfer paper and subsequently the dye is sublimated and
transferred from the transfer paper to fibers by heat. For
dispersing disperse dye ink used for printing, anionic dispersants
used conventionally for industrial dyeing have been used (JP
H9-291235 A [PTL 1] and JP H8-333531 A [PTL 2]). However, our
studies revealed that these anionic dispersants are problematic not
only in the sedimentation stability in dispersions, but also in the
ejection stability of the resulting ink. JP 2003-246954 A (PTL 3)
describes the use of a dispersant of the expression 1 in PTL 3. It
was also found, however, that the dispersant exhibited good
discharge stability, but is still problematic in sedimentation
stability (storage stability).
[0005] In order to expand the field of use of printing processes
using ink, there is ongoing need for ink compositions used for ink
jet recording and the resulting colored objects to have fastnesses
such as light fastness, water resistance, and so on. Such ink
compositions used for ink jet recording are strongly required to be
stable as ink for a long period of time and to be redissolved or
redispersed in water when dried.
[0006] In particular, disperse dyes are required to be stable over
an extended period of time. It is generally known that a dye which
exists in a dispersed state as particles, not as a molecule, in ink
causes a sedimentation phenomenon over time due to aggregation of
dye particles. This causes a concentration gradient in the ink, and
the desired printing properties cannot be obtained. In the worst
case, aggregated particles clog the nozzles, preventing them from
ejecting the ink.
[0007] Therefore, there is a demand for development of an ink
composition that has good fastnesses, high image density obtained
by printing, and good storage stability when used as an ink
composition. However, the conventional techniques have not been
able to provide sufficient performance.
[0008] Inkjet ink compositions using a pigment include the ink of
JP 4078679 B (PTL 6). This is an ink composition prepared by using
a polymer dispersion. In addition, JP 4016483 B (PTL 5) describes
an ink composition using a self-dispersion type pigment.
[0009] In recent years, microcapsule pigments using a
self-assembled pigment have been extensively studied and
investigated as means for addressing the above issues. In this
respect, JP 2675956 B (PTL 8) describes a manufacturing method
thereof. However, none of these ink compositions has yet provided
products that fully satisfy the market requirements.
CITATION LIST
Patent Literature
[0010] PTL 1: JP H9-291235 A [0011] PTL 2: JP H8-333531 A [0012]
PTL 3: JP 2003-246954 A [0013] PTL 4: JP 3534395 B [0014] PTL 5: JP
4016483 B [0015] PTL 6: JP 4078679 B [0016] PTL 7: WO 2010/013651 A
[0017] PTL 8: JP 2675956 B [0018] PTL 9: JP 3839829 B [0019] PTL
10: WO 2014/129322 A [0020] PTL 11: WO 2013/115071 A
Non-Patent Literature
[0020] [0021] NPL 1: Journal of the Japan Imaging Society, Vol. 41,
No. 2, pp 68 top 74 (2002) [0022] NPL 2: Senshoku Keizai Shimbun,
Jan. 28, 2004, pp. 18-21 [0023] NPL 3: Chemical Engineering
Dictionary, 4th Edition, pp. 46-47 [0024] NPL 4: DIC Technical
Review No. October 2004
SUMMARY
Technical Problem
[0025] It would thus be helpful to provide an ink emulsion
composition that offers good storage stability of a dispersion,
that has good stability when used as an ink composition, and that
preserves the physical properties when stored for a long period of
time.
Solution to Problem
[0026] As a result of our diligent investigation to solve the above
issues, it was found that extremely high ink stability can be
obtained with an emulsion liquid containing a dye and/or a pigment,
a styrene-acrylic copolymer, and a propylene glycol-based solvent,
and the present disclosure was completed based on this finding.
[0027] In other words, the present disclosure relates to 1) to 18)
below.
1)
[0028] An ink emulsion composition comprising: (A) a dye and/or a
pigment; (B) a styrene-(meth)acrylic copolymer; and (C) a compound
in an amount of more than 0.18 mass %, the compound (C) being
represented by formula (1):
##STR00002##
[0029] where t represents 1 to 5.
2)
[0030] The ink emulsion composition according to 1), wherein the
component (A) is at least one dye selected from a disperse dye, an
oil-soluble dye, or a vat dye.
3)
[0031] The ink emulsion composition according to 1) or 2), wherein
the component (A) is at least one dye selected from C.I. Disperse
Yellow 54, C.I. Disperse Orange 25, C.I. Disperse Red 60, C.I.
Disperse Blue 72, 359, 360, C.I. Disperse Brown 26, 27, or C.I.
Solvent Orange 60.
4)
[0032] The ink emulsion composition according to any one of 1) to
3), wherein the component (B) has a weight-average molecular weight
of 1000 or more and 20000 or less.
5)
[0033] The ink emulsion composition according to any one of 1) to
4), wherein the component (B) has a glass transition temperature of
45.degree. C. or higher and 135.degree. C. or lower.
6)
[0034] The ink emulsion composition according to any one of 1) to
5), wherein the component (B) is a styrene-acrylic copolymer having
in its molecule a skeleton represented by the following formula (2)
or (3):
##STR00003##
[0035] where n.sub.1 to n.sub.3 each represent an integer of 1 to
30, or
##STR00004##
[0036] where m.sub.1 and m.sub.2 each represent an integer of 1 to
43.
7)
[0037] The ink emulsion composition according to any one of 1) to
6), wherein t is 2 in the component (C).
8)
[0038] The ink emulsion composition according to any one of 1) to
7), further comprising: (D) a compound having in its molecule both
substituents of an amino group and a sulfo group.
9)
[0039] The ink emulsion composition according to 8), wherein the
component (D) is a compound represented by formula (4):
H.sub.2N--R--SO.sub.3H (4)
[0040] where R represents an alkylene group, an alkylidene group,
or an arylene group which may have a substituent.
10)
[0041] The ink emulsion composition according to any one of 1) to
9), further comprising: (E) a water-soluble organic solvent.
11)
[0042] The ink emulsion composition according to 10), wherein the
component (E) is a water-soluble organic solvent having in its
molecule one or more hydroxy groups.
12)
[0043] The ink emulsion composition according to any one of 1) to
11), wherein the component (A) has a number-average particle size
of 10 nm to 500 nm.
13)
[0044] A method of producing the ink emulsion composition as
recited in any one of 1) to 12), the method comprising neutralizing
and dissolving with an alkaline aqueous solution.
14)
[0045] An ink dispersion composition comprising: the ink emulsion
composition as recited in any one of 1) to 12); and (F) a
defoamer.
15)
[0046] The ink dispersion composition according to 14), wherein the
component (F) is a nonionic surfactant.
16)
[0047] The ink dispersion composition according to 14) or 15),
further comprising: (G) a preservative.
17)
[0048] A water-based ink comprising either the ink emulsion
composition as recited in any one of 1) to 12) or the ink
dispersion composition as recited in any one of 14) to 16).
18)
[0049] The water-based ink according to 17), further comprising:
(H) a compound represented by formula (5):
##STR00005##
[0050] where s represents 1 to 5.
Advantageous Effect
[0051] According to the present disclosure, an ink emulsion
composition having excellent storage stability can be obtained, and
an aqueous dispersion and an ink composition of a water-insoluble
colorant can be provided by utilizing the same.
DETAILED DESCRIPTION
[0052] The emulsion composition of the present disclosure is a
mixture produced when strongly stirring two different liquids which
are not mutually soluble, for example, one in which oil is
emulsified in water, or one in which water is emulsified in
oil.
[0053] [Component (A): Dye and/or Pigment]
[0054] In the present disclosure, the component (A) is a dye and/or
a pigment.
[0055] As used herein, the term "dye" refers to an organic coloring
matter which is dyed onto fibers by an appropriate dyeing method.
Examples thereof include a direct dye, a vat dye, a sulfur dye, a
disperse dye, a basic dye, a naphthol dye, an acidic dye, an acidic
mordant dye, a mordant dye, an oil-soluble dye, a reactive dye, a
soluble vat dye, a sulfur vat dye, and an oxidation dye.
[0056] Specifically, examples of C.I. Disperse Yellow include C.I.
Disperse Yellow 3, 4, 5, 7, 8, 9, 13, 23, 24, 30, 33, 34, 39, 42,
44, 49, 50, 51, 54, 56, 58, 60, 63, 64, 66, 68, 71, 74, 76, 79, 82,
83, 85, 86, 88, 90, 91, 93, 98, 99, 100, 104, 114, 116, 118, 119,
122, 124, 126, 135, 140, 141, 149, 160, 162, 163, 164, 165, 179,
180, 182, 183, 186, 192, 198, 199, 200, 202, 204, 210, 211, 215,
216, 218, 224, and 237. Also, examples of C.I. Disperse Orange
include C.I. Disperse Orange 1, 1:1, 3, 5, 7, 11, 13, 17, 20, 21,
23, 24, 25, 25:1, 29, 30, 31, 32, 33, 37, 38, 42, 43, 44, 45, 47,
48, 49, 50, 53, 54, 55, 56, 57, 58, 59, 61, 66, 71, 73, 76, 78, 80,
86, 89, 90, 91, 93, 96, 97, 118, 119, 127, 130, 139, and 142. Also,
examples of C.I. Disperse Red include C.I. Disperse Red 1, 4, 5, 7,
11, 12, 13, 15, 17, 27, 43, 44, 50, 52, 53, 54, 55, 55:1, 56, 58,
59, 60, 65, 70, 72, 73, 74, 75, 76, 78, 81, 82, 86, 88, 90, 91, 92,
93, 96, 103, 105, 106, 107, 108, 110, 111, 113, 117, 118, 121, 122,
126, 127, 128, 131, 132, 134, 135, 137, 143, 145, 146, 151, 152,
153, 154, 157, 158, 159, 164, 167, 169, 177, 179, 181, 183, 184,
185, 188, 189, 190, 191, 192, 200, 201, 202, 203, 205, 206, 207,
210, 221, 224, 225, 227, 229, 239, 240, 257, 258, 277, 278, 279,
281, 283, 288, 298, 302, 303, 310, 311, 312, 320, 323, 324, 328,
359, 362, and 364. Other examples include, but are not limited to:
C.I. Disperse Violet 1, 4, 8, 11, 17, 23, 26, 27, 28, 29, 31, 33,
35, 36, 38, 40, 43, 46, 48, 49, 50, 51, 52, 56, 57, 59, 61, 63, 69,
77, and 97; C.I. Disperse Green 9; C.I. Disperse Brown 1, 2, 4, 9,
13, 19, 26, and 27; C.I. Disperse Blue 3, 5, 7, 9, 14, 16, 19, 20,
26, 26:1, 27, 35, 43, 44, 54, 55, 56, 58, 60, 62, 64, 64:1, 71, 72,
72:1, 73, 75, 77, 79, 79:1, 81, 82, 83, 87, 91, 93, 94, 95, 64:1,
96, 102, 106, 108, 112, 113, 115, 118, 120, 122, 125, 128, 130,
131, 139, 141, 142, 143, 145, 146, 148, 149, 153, 154, 158, 165,
165:1, 165:2, 167, 171, 173, 174, 176, 181, 183, 185, 186, 187,
189, 197, 198, 200, 201, 205, 207, 211, 214, 224, 225, 257, 259,
266, 267, 270, 281, 284, 285, 287, 288, 291, 293, 295, 297, 301,
315, 330, 333, 334, 339, 341, 353, 354, 358, 359, 360, 364, 365,
366, and 368; C.I. Disperse Black 1, 3, 10, and 24; C.I. Solvent
Yellow 114; C.I. Solvent Orange 60 and 67; C.I. Solvent Red 146;
and C.I. Solvent Blue 36, 63, 83, 105, and 111.
[0057] As used herein, the term "pigment" refers to a white or
colored powder which is insoluble in water, an organic solvent, or
the like. Examples thereof include an organic pigment and an
inorganic pigment. In the present disclosure, it may be an organic
pigment or an inorganic pigment, yet an organic pigment is
preferable.
[0058] Specific examples include: C.I. Pigment Yellow 74, 120, 128,
138, 151, 185, and 217; C.I. Pigment Orange 13, 16, 34, and 43;
C.I. Pigment Red 122, 146, and 148; C.I. Pigment Violet 19 and 23;
C.I. Pigment Blue 15, 15:1, 15:2, 15:3, 15:4, 15:5, and 15:6; and
C.I. Pigment Green 7 and 8.
[0059] In the present disclosure, a dye is more preferably used.
Even more preferably, at least one selected from of a disperse dye,
an oil-soluble dye, or a vat dye is used. Among the above dyes,
those having higher thermal transfer ability include: C.I. Disperse
Yellow 51, 54, 60, 71, 82, and 211; C.I. Disperse Orange 5, 7, 20,
23, 24, 25, and 25:1; C.I. Disperse Red 4, 11, 50, 53, 59, 60, 239,
240, and 364; C.I. Disperse Violet 8, 11, 17, 26, 27, 28, and 36;
C.I. Disperse Blue 3, 5, 26, 35, 55, 56, 72, 81, 91, 108, 334, 359,
360, and 366; C.I. Disperse Brown 26 and 27; C.I. Solvent Yellow
114; C.I. Solvent Orange 60 and 67; C.I. Solvent Red 146; and C.I.
Solvent Blue 36, 63, 83, 105, and 111. More preferred are: C.I.
Disperse Yellow 54; C.I. Disperse Orange 25; C.I. Disperse Red 60;
C.I. Disperse Blue 72, 359, and 360; C.I. Disperse Brown 26 and 27;
and C.I. Solvent Orange 60. Particularly preferred are: C.I.
Disperse Yellow 54; C.I. Disperse Orange 25; and C.I. Disperse Red
60.
[0060] These coloring materials may be in the form of a powdery or
bulky dry coloring matter or a wet cake or slurry, and may contain
a small amount of a dispersant such as a surfactant for the purpose
of suppressing the aggregation of the coloring material particles
during or after synthesis of the coloring material. These
commercially available coloring materials have grades such as for,
e.g., industrial dyeing, resin coloring, ink, toner, and inkjet
use, and their production methods, purity, pigment particle size,
and the like are different from each other. In order to suppress
the aggregation after pulverization, a coloring material having a
smaller particle size is preferable, and considering the influence
on the dispersion stability and the ejection accuracy of the ink,
it is preferable to use a coloring material with as little
impurities as possible. As a coloring material for black, it is
possible to use a dye obtained by blending a blue-based dye as a
main ingredient with an orange-based dye and a red-based dye. It
may also contain a small amount of other water-insoluble coloring
materials within the range of color tone adjustment.
[0061] The above-described dye may be obtained by blending, for
example, in preparation of a black ink, a blue dye as a main
ingredient with an orange dye and a red dye as appropriate so as to
be toned to a black color, which may be used as a black dye. For
the purpose of finely adjusting the color tone of, for example,
blue, orange, red, violet, or black to a favorable color tone, two
or more dyes may be blended.
[0062] The content of the component (A) in the ink emulsion
composition disclosed herein is preferably in the range of 0.1 mass
% to 30 mass %, and more preferably in the range of 5 mass % to 20
mass %. When the content of the component (A) in the ink emulsion
composition is within the above range, the composition exhibits
excellent storage stability and sedimentation properties.
[0063] [Component (B): styrene-(meth)acrylic Copolymer]
[0064] In the present disclosure, the component (B) is a
styrene-(meth) acrylic copolymer, which is a copolymer of a
styrenic monomer and a (meth)acrylic monomer. As used herein, the
term "(meth)acrylic" means "acrylic" and/or "methacrylic".
[0065] Specific examples of these copolymers include an
(.alpha.-methyl)styrene-acrylic acid copolymer, an
(.alpha.-methyl)styrene-acrylic acid-acrylic acid ester copolymer,
an (.alpha.-methyl)styrene-methacrylic acid copolymer, an
(.alpha.-methyl)styrene-methacrylic acid-acrylic acid ester
copolymer, an (.alpha.-methyl)styrene-(anhydrous) maleic acid
copolymer, an acrylic acid ester-(anhydrous) maleic acid copolymer,
an (.alpha.-methyl)styrene-acrylic acid ester-(anhydride) maleic
acid copolymer, an acrylic acid ester-allylsulfonic acid ester
copolymer, an acrylic ester-styrene sulfonic acid copolymer, an
(.alpha.-methyl)styrene-methacrylic sulfonic acid copolymer, a
polyester-acrylic acid copolymer, a polyester-acrylic acid-acrylic
acid ester copolymer, a polyester-methacrylic acid copolymer, a
polyester-methacrylic acid-acrylic acid copolymer ester, and the
like. Of these, preferred compounds containing an aromatic
hydrocarbon group are those containing styrene.
[0066] As used herein, the term "(.alpha.-methyl)styrene" should be
construed as including .alpha.-methyl styrene and styrene.
[0067] Specific examples of the component (B) in the present
disclosure include, but are not limited to, Joncryl.RTM. 52J, 57J,
60J, 63J, 70J, JDX-6180, HPD-196, HPD 96J, PDX-6137 A, 6610,
JDX-6500, JDX-6639, PDX-6102B, and PDX-6124 (all manufactured by
BASF). As used herein, .RTM. means a registered trademark in Japan,
other countries, or both.
[0068] In the present disclosure, the component (B) has a
weight-average molecular weight of preferably from 1000 to 20000,
more preferably from 2000 to 19000, and particularly preferably
from 4000 to 17000. If the weight-average molecular weight is too
small, the dispersion stabilizing ability for a sublimable dye
decreases, while if it is too large, the ability to disperse the
sublimable dye decreases and the viscosity of the ink may
excessively increase. Both are not preferable. The weight-average
molecular weight of the styrene-acrylic acid copolymer is measured
by a GPC (gel permeation chromatography) method.
[0069] The glass transition temperature of the
styrene-(meth)acrylic copolymer used as the component (B) is
preferably from 45.degree. C. to 135.degree. C., more preferably
from 55.degree. C. to 120.degree. C., particularly preferably from
60.degree. C. to 110.degree. C.
[0070] Further, the acid value of the styrene-(meth)acrylic
copolymer used as the component (B) is preferably from 50 mg KOH/g
to 250 mg KOH/g, more preferably from 100 mg KOH/g to 250 mg KOH/g,
and particularly preferably from 150 mg KOH/g to 250 mg KOH/g. An
excessively small acid value causes deterioration in the solubility
of the resin, which tends to lower the dispersion stabilizing
ability for the sublimable dye, while an excessively large acid
value increases the affinity with an aqueous medium, which causes
bleeding to easily occur in the printed image. Both are not
preferable. The acid value of the resin, which represents the
amount in milligrams of KOH required to neutralize 1 g of the
resin, is measured in accordance with JIS-K3054.
[0071] The component (B), which is a styrene-(meth)acrylic
copolymer in the present disclosure, is preferably a component
having in its molecule a skeleton represented by formula (2) and/or
formula (3) given above. In formula (2), n.sub.1 to n.sub.3
represent an integer of 1 to 30. In formula (3), m.sub.1 and
m.sub.2 represent an integer of 1 to 43.
[0072] In this respect, specific examples of the preferred
styrene-(meth)acrylic copolymer of the component (B) include
Joncryl 67 (weight-average molecular weight=12,500, acid
value=213), Joncryl 678 (weight-average molecular weight=8,500,
acid value=215), Joncryl 682 (weight-average molecular
weight=1,700, acid value=230), Joncryl 683 (weight-average
molecular weight=8,000, acid value=160), and Joncryl 690
(weight-average molecular weight=16,500, acid value=240).
[0073] The ink emulsion composition disclosed herein may also be
prepared by using two different styrene-acrylic copolymer
dispersants when dispersing a coloring matter.
[0074] For example, the emulsion composition disclosed herein is
preferably produced by the following method.
[0075] A styrene-acrylic copolymer is charged into a water-soluble
organic solvent and the temperature is raised to 90-120.degree. C.
to dissolve it to prepare a solution of a styrene-acrylic
copolymer. Further, a styrene-acrylic copolymer is suspended in
water, a neutralizing agent is added thereto, and the temperature
is raised to 80-95.degree. C. to prepare a neutralized solution.
The styrene-acrylic copolymer solution and the neutralized solution
thus prepared are mixed with a colorant and the mixture is
dispersed. In this way, a styrene-acrylic copolymer emulsion
composition containing a colored body can be produced.
[0076] It is also preferable to produce the styrene-acrylic
copolymer emulsion composition containing a dye and/or a pigment
for example by the following method.
[0077] A styrene-acrylic copolymer is charged into a water-soluble
organic solvent and the temperature is raised to 90-120.degree. C.
to prepare a solution of a styrene-acrylic copolymer. A
neutralizing agent and water is then charged to the solution, the
temperature is lowered to make an emulsion liquid (an emulsion or
microemulsion liquid), the emulsion liquid thus prepared is mixed
with a dye and/or a pigment, and the mixture is dispersed. In this
way, a styrene-acrylic copolymer emulsion composition containing
the dye and/or the pigment can be produced.
[0078] Examples of the water-soluble organic solvent include
glycerin (boiling point: 290.degree. C.), ethylene glycol,
propylene glycol (boiling point: 188.degree. C.), dipropylene
glycol (boiling point: 230.degree. C.), butyl carbitol (boiling
point: 231.degree. C.), methyl triglycol, triethylene glycol, butyl
triglycol, butyl carbitol acetate (boiling point: 247.degree. C.),
diethylene glycol, 1,5-pentanediol, 1,6-hexanediol, 1,2-hexanediol,
methyl diglycol, tripropylene glycol, methanol (boiling point:
64.degree. C.), ethanol (boiling point: 78.degree. C.), 1-propanol
(boiling point: 97.degree. C.), 2-propanol (boiling point:
82.degree. C.), 1,2-methoxyethane (boiling point: 93.degree. C.),
tetrahydrofuran (boiling point: 66.degree. C.), and p-dioxane
(boiling point: 101.degree. C.). These water-soluble organic
solvents may be used alone or in combination of at least two
thereof.
[0079] Since the ink emulsion composition before mixing with the
dye and/or the pigment is prepared by neutralizing with a
neutralizing agent and mixing with water, it is necessary to use a
neutralizing agent.
[0080] Examples of the neutralizing agent include hydroxides of
alkali metals, hydroxides of alkaline earth metals, aliphatic amine
compounds, and alcohol amine compounds.
[0081] Examples of alkali metal hydroxides include lithium
hydroxide, sodium hydroxide, and potassium hydroxide. Examples of
hydroxides of alkaline earth metals include beryllium hydroxide,
magnesium hydroxide, calcium hydroxide, and strontium hydroxide.
The neutralizing agent is preferably a hydroxide of an alkali
metal, more preferably lithium hydroxide, sodium hydroxide, and
potassium hydroxide, and more preferably potassium hydroxide.
[0082] Examples of the alcohol amine compound include monoethanol
amine, diethanol amine, triethanol amine, monopropanol amine,
dipropanol amine, tripropanol amine, methylethanol amine,
dimethylethanol amine, and N-methyl diethanol amine; among these
preferred are tertiary amines, and more preferred is
triethanolamine.
[0083] Examples of the aliphatic amine compound include ammonia,
monomethylamine, dimethylamine, trimethylamine, monoethylamine,
diethylamine, and triethylamine; among these preferred is ammonia
or triethylamine.
[0084] These neutralizing agents may be used alone or in
combination of at least two thereof.
[0085] The amount of the emulsion liquid to be used is preferably
from 10% to 200%, more preferably from 10% to 150%, and
particularly preferably from 20% to 100%, based on the mass of the
dye and/or the pigment.
[0086] In mixing the dye and/or the pigment with the emulsion
liquid and dispersing the mixture, the dispersing may be performed
using a sand mill (bead mill), a roll mill, a ball mill, a paint
shaker, an ultrasonic disperser, or a microfluidizer; among these
preferred is a sand mill (bead mill). In pulverizing the coloring
material in a sand mill (bead mill), the pulverizing is preferably
performed under the condition of increased pulverization efficiency
by, for example, using beads of small diameter and increasing the
filling rate of beads, and after the pulverization treatment,
elementary particles are preferably removed by centrifugal
separation or the like. In addition, in terms of increasing the
pulverization efficiency as some ink emulsion compositions have
foaming properties, it is preferable to adjust pulverization
conditions so that foaming is suppressed as much as possible during
pulverization. In some cases, for example, a silicone- or acetylene
alcohol-based defoamer may be added in trace amounts at the time of
pulverizing the pigment. As some defoamers inhibit dispersion and
microparticulation, however, it is necessary to use the one not
affecting the microparticulation or the stability after
dispersion.
[0087] After the dispersing or post-treatment such as filtration,
the dispersion can be diluted with a small amount of water to
adjust the coloring material to a desired concentration.
[0088] In the ink emulsion composition disclosed herein, the
number-average particle size of the component (A) is preferably
from 10 nm to 500 nm. When the number-average particle size of the
component (A) is from 10 nm to 500 nm, the composition exhibits
excellent storage stability and sedimentation properties. In the
present disclosure, the number-average particle size is measured
using a dynamic light scattering-type particle size analyzer or
according to a small angle X-ray scattering method.
[0089] In the ink emulsion composition disclosed herein, the
content of the component (B) is preferably in the range of 5 mass %
to 250 mass %, and more preferably in the range of 20 mass % to 150
mass %, with respect to the component (A). When the content of the
component (B) in the ink emulsion composition is within the above
range, the composition exhibits excellent storage stability and
sedimentation properties.
[0090] [Component (C): Compound Represented by Formula (1)]
[0091] The compound represented by formula (1) contained in the ink
emulsion composition disclosed herein is a propylene glycol-based
compound. In formula (1), t represents an integer of 1 to 5,
preferably an integer of 1 to 3, and more preferably 1 or 2.
Specific examples thereof include propylene glycol and dipropylene
glycol.
[0092] In the ink emulsion composition disclosed herein, the
content of the component (C) is more than 0.18 mass %. If the
content of the component (C) is not more than 0.18 mass %, it is
not possible to sufficiently improve the storage stability of the
composition.
[0093] In addition, in the ink emulsion composition disclosed
herein, the content of the component (C) is preferably in the range
of 1 mass % to 60 mass %, and more preferably in the range of 10
mass % to 30 mass %. When the content of the component (C) in the
ink emulsion composition is within the above range, it is possible
to retain an O/W emulsion composition, and thus to prepare a
core-shell coloring matter dispersion, contributing to stability
improvement.
[0094] [Component (D): Compound Having Both Substituents of an
Amino Group and a Sulfo Group in its Molecule]
[0095] The component (D) disclosed herein is a compound having in
its molecule both substituents of an amino group and a sulfo group.
It is considered that this compound is ionically bonded to the
carboxy group of the component (B) and behaves as if it has a
terminal sulfo group, thereby improving the stability.
[0096] As the component (D), a compound represented by formula (4)
is preferable. In formula (4), R represents an alkylene group which
may have a substituent, an alkylidene group which may have a
substituent, or an arylene group which may have a substituent.
[0097] The phrase "an alkylene group which may have a substituent"
refers to an alkylene group which is saturated or unsaturated, is a
chain or cyclic (preferably C1-C20) alkylene group, and may have a
hetero atom. Examples thereof include a methylene group, an
ethylene group, a propylene group, a butylene group, a
cyclopentylene group, a cyclohexylene group, a norbornylene group,
and an adamantylene group; among these preferred are a (C1-C10)
alkylene group, more preferred is a (C1-C5) alkylene group, and
particularly preferred are a methylene group, an ethylene group,
and a propylene group. Examples of the substituent which may be
present in the alkylene group include: a halogen atom; a cyano
group; a hydroxy group; a carboxy group; a sulfo group; a sulfamoyl
group; a (C1-C4) alkoxy group; a (C1-C4) alkoxy group substituted
with at least one selected from the group consisting of a hydroxy
group, a (C1-C4) alkoxy group; a sulfo group, and a carboxy group;
an N-alkylaminosulfonyl group; an N-phenylaminosulfonyl group; a
phospho group; a nitro group; an acyl group; an ureido group; and a
(C1-C6) alkyl group substituted with an acylamino group or the like
substituted with at least one selected from the group consisting of
an acylamino group, a (C1-C4) alkoxy group, a sulfo group, and a
carboxy group.
[0098] The phrase "an alkylidene group which may have a
substituent" refers to an alkylidene group which is saturated or
unsaturated, is a chain or cyclic (preferably C1-C20) alkylidene
group, and may have a hetero atom. Examples thereof include an
ethylidene group, a propylidene group, a butylidene group, a
cyclopentylidene group, a cyclohexylidene group, a norbornylidene
group, and an adamantylidene group; among these preferred is a
(C1-C10) alkylidene group, more preferred is (C1-05) alkylidene
group, and particularly preferred are an ethylidene group or a
propylidene group. Examples of the substituent which may be present
in the alkylidene group are the same as those listed for the
alkylene group.
[0099] The phrase "an arylene group which may have a substituent"
refers to a (preferably C1-C20) arylene group which may have a
hetero atom. Examples thereof include a phenylene group, a
thienylene group, and a pyrrolylene group, in which two or more
ring structures may be condensed with each other as is the case
with, for example, a naphthylene group, an anthranylene group, a
phenanthrylene group, or a quinolylene group. Examples of the
substituent which may be present in the arylene group are the same
as those listed for the alkylene group.
[0100] Also, R may have an ester structure (--COO--), an ether
structure (--O--), or a keto structure (--(C.dbd.O)--).
[0101] Specific examples of the compound represented by formula (4)
include taurine, 4-amino-1-naphthalenesulfonic acid,
hydroxylaminosulfonic acid, 5-amino-1-naphthalenesulfonic acid,
hydroxylaminosulfonic acid, 6 amino-1-naphthalenesulfonic acid,
hydroxylaminosulfonic acid, 3-amino-2,7-naphthalenedisulfonic acid,
2-amino-1,4-benzenesulfonic acid, and 4-aminobenzenesulfonic
acid.
[0102] In the ink emulsion composition disclosed herein, the
content of the component (D) is preferably in the range of 0.1 mass
% to 40 mass %, and more preferably in the range of 1 mass % to 20
mass %. When the content of the component (D) in the ink emulsion
composition is within the above range, the stability of the ink
emulsion composition is improved by solvation due to the influence
of the sulfo group.
[0103] [Component (E): Water-Soluble Organic Solvent]
[0104] The ink emulsion composition disclosed herein may further
contain a water-soluble organic solvent (E). Specific examples of
the water-soluble organic solvent include: (C1-C4) alcohols such as
methanol, ethanol, propanol, isopropanol, butanol, isobutanol,
secondary butanol, and tertiary butanol; carboxylic acid amides
such as N,N-dimethylformamide or N,N-dimethylacetamide; lactams
such as 2-pyrrolidone, hydroxyethyl-2-pyrrolidone,
N-methyl-2-pyrrolidone, or N-methylpyrrolidin-2-one; cyclic ureas
such as 1,3-dimethylimidazolidin-2-one and
1,3-dimethylhexahydropyrimid-2-one; ketones or ketoalcohols such as
acetone, methyl ethyl ketone, and 2-methyl-2-hydroxypentane-4-one;
cyclic ethers such as tetrahydrofuran and dioxane; mono-, oligo- or
polyalkylene glycols or thioglycols having C2-C6 alkylene units
such as ethylene glycol, 1,3-propane diol, 1,2-butylene glycol,
1,4-butylene glycol, 1,6-hexylene glycol, diethylene glycol,
triethylene glycol, tetraethylene glycol, polyethylene glycol,
polypropylene glycol (represented by formula (1), excluding those
with t being 5 or less), thiodiglycol, and dithiodiglycol; polyols
(preferably triols) such as trimethylolpropane, glycerin,
hexane-1,2,6-triol; (C1-C4) alkyl ethers of polyhydric alcohols
such as ethylene glycol monomethyl ether, ethylene glycol monoethyl
ether, diethylene glycol monomethyl ether, diethylene glycol
monoethyl ether, diethylene glycol monobutyl ether (butyl
carbitol), and triethylene glycol monomethyl ether, and triethylene
glycol monoethyl ether; .gamma.-butyrolactone; and dimethyl
sulfoxide. These organic solvents may be used alone or in
combination of at least two thereof.
[0105] As used herein, the phrase "water-soluble organic solvent
(E)" refers to a water-soluble organic solvent other than those
listed in the section "Component (C): Compound Represented by
Formula (1)".
[0106] Although the water-soluble organic solvent also includes
substances which are solid at room temperature, such as
trimethylolpropane, they are water-soluble even in a solid state
and can be used for the same purpose as the water-soluble organic
solvent when dissolved in water. They are thus described herein in
the category of water-soluble organic solvent for convenience.
[0107] The component (E) is preferably a water-soluble organic
solvent having in its molecule one or more hydroxy groups.
[0108] In the ink emulsion composition disclosed herein, the
content of the component (E) is preferably in the range of 1 mass %
to 60 mass %, and more preferably in the range of 10 mass % to 30
mass %. When the content of the component (E) in the ink emulsion
composition is within the above range, it is possible to retain an
O/W emulsion composition, and thus to prepare a core-shell coloring
matter dispersion, contributing to stability improvement.
[0109] [Component (F): Defoamer]
[0110] It is also possible to prepare an ink dispersion composition
in which (F) a defoamer is added to the ink emulsion
composition.
[0111] A defoamer refers to a substance having an action of
extinguishing foam or suppressing foaming in a solution, including,
for example, an oily substance with low volatility and high
diffusing ability (such as higher alcohol) and a nonionic
surfactant.
[0112] Examples of nonionic surfactants include: ethers such as
polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl
ether, polyoxyethylene dodecyl phenyl ether, polyoxyethylene oleyl
ether, polyoxyethylene lauryl ether, and polyoxyethylene alkyl
ether; esters such as polyoxyethylene oleic acid ester,
polyoxyethylene distearic acid ester, sorbitan laurate, sorbitan
monostearate, sorbitan monooleate, sorbitan sesquioleate,
polyoxyethylene monooleate, and polyoxyethylene stearate; acetylene
glycols (alcohols) such as 2,4,7,9-tetramethyl-5-decyne-4,7-diol,
3,6-dimethyl-4-octyne-3,6-diol, 3,5-dimethyl-1-hexyne-3-ol;
Surfynol 104, 105, 82, 465, Olfine STG, etc. (all manufactured by
Nissin Chemical Industry Co., Ltd.); and polyglycol ethers (e.g.,
Tergitol 15-S-7 manufactured by SIGMA-ALDRICH).
[0113] Of these, acetylene glycol-based defoamers are preferred,
and more preferred are Surfynol 104, 105, 82, and 465 manufactured
by Nissin Chemical Industry Co., Ltd.
[0114] In the ink emulsion composition disclosed herein, the
content of the component (F) is preferably in the range of 0.01
mass % to 0.5 mass %, and more preferably in the range of 0.05 mass
% to 0.3 mass %. Adjusting the content of the component (F) in the
ink dispersion composition within the above range provides a
defoaming effect during the dispersing, enabling the dispersion to
proceed efficiently with no adverse effect on the dispersion
stability.
[0115] [Component (G): Preservative]
[0116] It is also possible to prepare an ink dispersion composition
in which a preservative (G) is further added to the ink emulsion
composition.
[0117] Examples of the preservative include organic sulfur-based
compounds, organic nitrogen sulfur-based compounds, organic
halogen-based compounds, haloaryl sulfone-based compounds,
iodopropargyl-based compounds, haloalkylthio-based compounds,
nitrile-based compounds, pyridine-based compounds,
8-oxyquinoline-based compounds, benzothiazole-based compounds,
isothiazoline-based compounds, dithiol-based compounds, pyridine
oxide-based compounds, nitropropane-based compounds, organic
tin-based compounds, phenolic compounds, quaternary ammonium
salt-based compounds, triazine-based compounds, thiazine-based
compounds, anilide-based compounds, adamantane-based compounds,
dithiocarbamate-based compounds, brominated indanone-based
compounds, benzyl bromoacetate-based compounds, or inorganic
salt-based compounds. Without limitation, specific examples of
organic halogen-based compounds include sodium pentachlorophenol,
specific examples of pyridine oxide-based compounds include sodium
2-pyridinethiol-1-oxide, and specific examples of
isothiazoline-based compounds include 1,2-benzisothiazolin-3-one,
2-n-octyl-4-isothiazolin-3-one,
5-chloro-2-methyl-4-isothiazolin-3-one,
5-chloro-2-methyl-4-isothiazolin-3-one magnesium chloride,
5-chloro-2-methyl-4-isothiazolin-3-one calcium chloride, and
2-methyl-4-isothiazolin-3-one calcium chloride. Specific examples
of other preservatives include anhydrous sodium acetate, sodium
sorbate, or sodium benzoate, Proxel.RTM. GXL(S) and Proxel.RTM.
GXL-2 manufactured by Arch Chemicals, Inc.
[0118] In the ink dispersion composition disclosed herein, the
content of the component (G) is preferably in the range of 0.01
mass % to 0.5 mass %, and more preferably in the range of 0.1 mass
% to 0.3 mass %. Adjusting the content of the component (G) in the
ink dispersion composition within the above range may provide a
bactericidal action, suppressing viscosity increase.
[0119] [Other Ingredients]
[0120] In addition to the components (A) to (G), the ink emulsion
composition disclosed herein may further contain, for example, an
antifungal agent, a pH adjuster, a chelating reagent, a rust
preventive agent, a water-soluble ultraviolet absorber, a
water-soluble polymer compound, a coloring matter solubilizer, an
antioxidant, or a surfactant, in addition to the above
components.
[0121] (Antifungal Agent)
[0122] Examples of antifungal agents include sodium dehydroacetate,
sodium benzoate, sodium pyridinethione-1-oxide, p-hydroxybenzoic
acid ethyl ester, 1,2-benzisothiazolin-3-one, and salts thereof.
When an antifungal agent is used, it is preferably used in an
amount of 0.02 mass % to 1.00 mass % in the emulsion
composition.
[0123] (PH Adjuster)
[0124] As the pH adjusting agent, any substance can be used as long
as the pH of the ink can be controlled within the range of
approximately 5-11 without adversely affecting the ink to be
prepared. Specific examples thereof include: alkanolamines such as
diethanolamine, triethanolamine, and N-methyldiethanolamine; alkali
metal hydroxides such as lithium hydroxide, sodium hydroxide, and
potassium hydroxide; ammonium hydroxide (ammonia water); carbonates
of alkali metals such as lithium carbonate, sodium carbonate,
sodium hydrogencarbonate, and potassium carbonate; alkali metal
salts of organic acids such as potassium acetate; and inorganic
bases such as sodium silicate, and disodium phosphate.
[0125] (Chelating Reagent)
[0126] Specific examples of the chelating reagent include sodium
ethylenediaminetetraacetate, sodium nitrilotriacetate, sodium
hydroxyethylethylenediamine triacetate, sodium diethylenetriamine
pentaacetate, and sodium uracil diacetate.
[0127] (Rust Preventive Agent)
[0128] Examples of the rust inhibitor include acidic sulfite,
sodium thiosulfate, ammonium thioglycolate, diisopropylammonium
nitrite, pentaerythritol tetranitrate, and dicyclohexylammonium
nitrite.
[0129] (Water-Soluble Ultraviolet Absorber)
[0130] Examples of water-soluble ultraviolet absorbers include
sulfonated benzophenone-based compounds, benzotriazole-based
compounds, salicylic acid-based compounds, cinnamic acid-based
compounds, and triazine-based compounds.
[0131] (Water-Soluble Polymer Compound)
[0132] Examples of water-soluble polymer compounds include
polyvinyl alcohols, cellulose derivatives, polyamines, and
polyimines.
[0133] (Antioxidant)
[0134] Examples of antioxidants may include a variety of organic
and metal complex-based anti-fading agents. Examples of the organic
anti-fading agents include hydroquinones, alkoxyphenols,
dialkoxyphenols, phenols, anilines, amines, indans, chromans,
alkoxyanilines, and heterocycles.
[0135] (Surfactant)
[0136] Examples of surfactants include known surfactants such as
anionic, cationic, nonionic, silicone-based, and fluorine-based
surfactants.
[0137] Examples of anionic surfactants include alkylsulfonates,
alkylcarboxylates, .alpha.-olefin sulfonates, polyoxyethylene alkyl
ether acetates, N-acylamino acids and salts thereof,
N-acylmethyltaurine salts, alkyl sulfate polyoxyalkyl ether
sulfates, alkyl sulfate polyoxyethylene alkyl ether phosphates,
rosin acid soap, castor oil sulfates, lauryl alcohol sulfates,
alkylphenol-type phosphoric acid ester, alkyl-type phosphoric acid
ester, alkylaryl sulfonate, diethyl sulfosuccinate,
diethylhexylsulfosuccinate, and dioctylsulfosuccinate.
[0138] In the present disclosure, it is particularly preferable to
contain an anionic surfactant. Among them, sulfosuccinic acid,
specifically, diethylsulfosuccinate, diethylhexylsulfosuccinate,
dioctylsulfosuccinate, and the like are particularly
preferable.
[0139] Examples of cationic surfactants include 2-vinylpyridine
derivatives and poly4-vinylpyridine derivatives.
[0140] Examples of amphoteric surfactants include
lauryldimethylaminoacetic acid betaine,
2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine,
coconut oil fatty acid amidopropyldimethylaminoacetic acid betaine,
polyoctylpolyaminoethylglycine, and imidazoline derivatives.
[0141] Examples of nonionic surfactants include: ethers such as
polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl
ether, polyoxyethylene dodecylphenyl ether, polyoxyethylene oleyl
ether, polyoxyethylene lauryl ether, and polyoxyethylene alkyl
ether; esters such as polyoxyethylene oleic acid ester,
polyoxyethylene distearic acid ester, sorbitan laurate, sorbitan
monostearate, sorbitan monooleate, sorbitan sesquioleate,
polyoxyethylene monooleate, and polyoxyethylene stearate; acetylene
glycols (alcohols) such as 2,4,7,9-tetramethyl-5-decyne-4,7-diol,
3,6-dimethyl-4-octyne-3,6-diol, and 3,5-dimethyl-1-hexyne-3-ol;
Surfynol 104, 105, 82, 465, Olfine STG, etc. (all manufactured by
Nissin Chemical Industry Co., Ltd.); and polyglycol ethers (e.g.,
Tergitol 15-S-7 manufactured by SIGMA-ALDRICH).
[0142] The above-described ink preparation agents are used alone or
in combination.
[0143] Examples of the silicone-based surfactants include
polyether-modified siloxane and polyether-modified
polydimethylsiloxane. Specific examples of commercially available
products include BYK-347 (polyether-modified siloxane), BYK-345,
and BYK-348 (polyether-modified polydimethylsiloxane), all
manufactured by BYK Japan KK.
[0144] Examples of the fluorine-based surfactants include
perfluoroalkyl sulfonic acid compounds, perfluoroalkyl carboxylic
acid-based compounds, perfluoroalkyl phosphoric acid ester
compounds, perfluoroalkyl ethylene oxide adducts, and
polyoxyalkylene ether polymer compounds having a perfluoroalkyl
ether group on a side chain. Specific examples of commercially
available products include Zonyl TBS, FSP, FSA, FSN-100, FSN,
FSO-100, FSO, FS-300, Capstone FS-30, FS-31 (manufactured by
DuPont); PF-151N, and PF-154N (manufactured by Omnova).
[0145] The ink emulsion liquid disclosed herein preferably has an
emulsion composition that contains particles such that, when a
circumscribed circle and an inscribed circle are applied
concentrically to each particle on an STEM image, for more than
half of the particles, the diameter of the inscribed circle is 5 nm
or more and less than 300 nm and the roundness defined by the
difference in radius between the concentric circumscribed circle
and the inscribed circle is 20 nm or less.
[0146] The ink emulsion composition disclosed herein is extremely
excellent in storage stability. Accordingly, this composition can
provide excellent ejection stability when used for water-based
inks, particularly water-based inks for inkjet printing.
[0147] In the case of a water-based ink, it is preferable that the
above-described dye and/or pigment is contained in the water-based
ink in an amount of 0.3 mass % to 10 mass % in terms of pure
colorant.
[0148] A water-based ink may be obtained with an additive such as
an antifungal agent, a pH adjuster, a chelate agent, a rust
preventive agent, a water-soluble ultraviolet absorber, a
water-soluble polymer compound, a coloring matter solubilizer, an
antioxidant, or a surfactant.
[0149] The pH of the water-based ink of the present disclosure is
preferably 5 to 11, more preferably 7 to 10, for the purpose of
improving storage stability. The pH and surface tension of the ink
composition of the present disclosure can be appropriately adjusted
with a pH adjuster or a surfactant as described later.
[0150] [Component (H): Compound Represented by Formula (5)]
[0151] The water-based ink disclosed herein may further contain (H)
a compound represented by formula (5).
[0152] In formula (5), s is an average degree of polymerization and
represents 1 to 5. As used herein, the average degree of
polymerization is indicated by rounding off the first digit after
the decimal point (rounding down at 4 or less and rounding up at 5
or more). Specific examples of the compound represented by formula
(5) include compounds such as glycerin, diglycerin, triglycerin,
tetraglycerin, pentaglycerin, hexaglycerin, and heptaglycerin, and
mixtures thereof. The degrees of polymerization of hexaglycerin and
heptaglycerin are 6 and 7, respectively, but when they are not used
alone but when used as a mixture with those with a smaller degree
of polymerization, the mixture may be contained in the water-based
ink of the present disclosure as long as the average degree of
polymerization of the mixture is in the above-described range.
Also, when the mixture has 50% glycerin and 50% triglycerin, for
example, the average degree of polymerization s is 2. However, a
larger glycerin content causes smoke or the like during sublimation
transfer, leading to problems during transfer dyeing, such as poor
visibility in the work environment. Therefore, the content of
glycerin in the compound represented by formula (5) is usually 10%
or less, preferably 8% or less, based on the gas chromatography
standard (peak area ratio), and the lower limit may be set at or
below the detection limit, that is, it may be 0%.
[0153] Commercially available products of the compound represented
by formula (5) include, for example, Glycerin (average degree of
polymerization s=1), Diglycerin S (average degree of polymerization
s=2), and Polyglycerin #310 (s=4), all manufactured by Sakamoto
Yakuhin Kogyo Co. Ltd.
[0154] In the water-based ink of the present disclosure, the
content of the component (H) is preferably in the range of 5 mass %
to 60 mass %, and more preferably in the range of 10 mass % to 40
mass %. When the content of the component (H) in the water-based
ink is within the above range, the ink exhibits excellent storage
stability and less smoke is produced during sublimation
transfer.
[0155] The water-based ink of the present disclosure can be used in
various fields. The water-based ink is, however, suitable for
water-based writing ink, water-based printing ink,
information-recording ink, textile printing, and the like, and is
particularly preferably used as ink for ink jet recording.
Examples
[0156] Hereinafter, the present disclosure will be described in
more detail with reference to examples, yet the present disclosure
is not limited by these examples. In the examples, "parts" means
"parts by mass", and "%" means "mass %".
[0157] [Emulsion Liquid 1]
[0158] To 48% sodium hydroxide (3.7 parts), deionized water (96.3
parts), and propylene glycol (60 parts) was added 40 parts of
Joncryl 683 (a styrene-(meth)acrylic copolymer, manufactured by
BASF, having in its molecule a skeleton of formula (2) with a
weight-average molecular weight of 8,000, a glass transition
temperature of 75.degree. C., and an acid value of 160 mg KOH/g),
the mixture was then stirred at raised temperatures of
90-120.degree. C. for 5 hours, and an emulsion liquid 1 of Joncryl
683 was obtained.
[0159] [Emulsion Liquid 2]
[0160] To 48% sodium hydroxide (4.1 parts), deionized water (95.9
parts), and propylene glycol (60 parts) was added 40 parts of
Joncryl 690 (a styrene-(meth)acrylic copolymer, manufactured by
BASF, having in its molecule a skeleton of formula (3) with a
weight-average molecular weight of 16,500, a glass transition
temperature of 102.degree. C., and an acid value of 240 mg KOH/g),
the mixture was then stirred at raised temperatures of
90-120.degree. C. for 5 hours, and an emulsion liquid 2 of Joncryl
690 was obtained.
[0161] [Emulsion Liquid 3]
[0162] 40 parts of Joncryl 690 (a styrene-(meth)acrylic copolymer,
manufactured by BASF, having in its molecule a skeleton of formula
(3) with a weight-average molecular weight of 16,500, a glass
transition temperature of 102.degree. C., and an acid value of 240
mg KOH/g) was added to propylene glycol (60 parts), and the mixture
was then stirred at raised temperatures of 90-120.degree. C. for 5
hours to obtain a 40% solution of Joncryl 690. The mixture was then
cooled down to 70-90.degree. C., added with 48% sodium hydroxide
(4.1 parts) and stirred for 1 hour. Then, the mixture was further
added with deionized water (180 parts) and 0.1 parts of Surfynol
104 (manufactured by Nissin Chemical Industry Co., Ltd.), and
stirred for 1 hour with keeping a temperature of 70-95.degree. C.
to obtain an emulsion liquid (A) of Joncryl 690.
[0163] The resulting emulsion liquid (A) was subjected to
dispersion treatment for about 15 hours in a sand mill using glass
beads having a diameter of 0.2 mm under cooling. After the
dispersion treatment, filtration was carried out with glass fiber
filter paper GC-50 (manufactured by Toyo Roshi Kaisha Ltd., filter
pore diameter=0.5 .mu.m) to obtain an emulsion liquid 3 of Joncryl
690 from which components having large particle size were
removed.
[0164] [Emulsion Liquid 4]
[0165] To 48% sodium hydroxide (3.1 parts), deionized water (96.9
parts), and propylene glycol (60 parts) was added 40 parts of
Joncryl 678 (a styrene-(meth)acrylic copolymer, manufactured by
BASF, having in its molecule a skeleton of formula (2) with a
weight-average molecular weight of 8,500, a glass transition
temperature of 85.degree. C., and an acid value of 215 mg KOH/g),
the mixture was then stirred at raised temperatures of
90-120.degree. C. for 5 hours, and an emulsion liquid 4 of Joncryl
678 was obtained.
[0166] [Emulsion Liquid 5]
[0167] To 48% potassium hydroxide (4.3 parts), deionized water
(95.7 parts), and propylene glycol (60 parts) was added 40 parts of
Joncryl 678 (a styrene-(meth)acrylic copolymer, manufactured by
BASF, having in its molecule a skeleton of formula (2) with a
weight-average molecular weight of 8,500, a glass transition
temperature of 85.degree. C., and an acid value of 215 mg KOH/g),
the mixture was then stirred at raised temperatures of
90-120.degree. C. for 5 hours, and an emulsion liquid 5 of Joncryl
678 was obtained.
[0168] [Emulsion Liquid 6]
[0169] To 48% lithium hydroxide (1.9 parts), deionized water (98.1
parts), and propylene glycol (60 parts) was added 40 parts of
Joncryl 678 (a styrene-(meth)acrylic copolymer, manufactured by
BASF, having in its molecule a skeleton of formula (2) with a
weight-average molecular weight of 8,500, a glass transition
temperature of 85.degree. C., and an acid value of 215 mg KOH/g),
the mixture was then stirred at raised temperatures of
90-120.degree. C. for 5 hours, and an emulsion liquid 6 of Joncryl
678 was obtained.
[0170] [Aqueous Solution 1]
[0171] A mixture was obtained by mixing 40 parts of Joncryl 690 (a
styrene-(meth)acrylic copolymer, manufactured by BASF, having in
its molecule a skeleton of formula (3) with a weight-average
molecular weight of 16,500, a glass transition temperature of
102.degree. C., and an acid value of 240 mg KOH/g), 48% sodium
hydroxide (6.8 parts), deionized water (153.0 parts), 0.1 parts of
Proxel GXL (manufactured by Arch Chemicals, Inc.), and 0.1 parts of
Surfynol 104 (manufactured by Nissin Chemical Industry Co., Ltd.),
and stirred at raised temperatures of 70-95.degree. C. for 10 hours
to obtain a 20% aqueous solution 1 of Joncryl 690.
[Examples 1-26 and Comparative Examples 1-6]--Preparation of Ink
Dispersion Composition--
[0172] Glass beads having a diameter of 0.2 mm were respectively
added to the mixtures of the components listed in Tables 1 to 6,
and dispersion treatment was carried out for about 15 hours in a
sand mill under water cooling. Deionized water was added to each
obtained liquid so that the content of dyes in the total mass of
the liquid was adjusted to 15%. The resulting liquids were
respectively filtered through glass fiber filter paper GC-50
(manufactured by ADVANTEC Co., Ltd.) to obtain ink dispersion
compositions of our examples and comparative examples.
TABLE-US-00001 TABLE 1 Examples Ink dispersion composition 1 2 3 4
5 6 7 Component (A): Or25 30 30 30 30 dye and/or pigment R60 30
B360 30 B359 30 Y54 B77 Component (B): Emulsion Liquid 1 78
emulsition liquid Emulsion Liquid 2 78 78 78 containing styrene-
Emulsion Liquid 3 78 66 (meth)acrylic Emulsion Liquid 4 78
copolymer Emulsion Liquid 5 Emulsion Liquid 6 Aqueous solution
Aqueous Solution 1 4 Component (C) Propylene glycol 10 10 10 10 10
10 10 Other components 10% SF 104 PG 0.4 0.4 0.4 0.4 0.4 0.4 0.4
Proxel GXL 0.3 0.3 0.3 0.3 0.3 0.3 0.3 Deionized water 81.3 81.3
81.3 89.3 81.3 81.3 81.3 Total 200 200 200 200 200 200 200
TABLE-US-00002 TABLE 2 Examples Ink dispersion composition 8 9 10
11 12 13 Component (A): Or25 30 dye and/or pigment R60 30 B360 30
B359 Y54 30 30 B77 30 Component (B): Emulsion Liquid 1 emulsition
liquid Emulsion Liquid 2 144 144 144 144 144 78 containing styrene-
Emulsion Liquid 3 (meth)acrylic Emulsion Liquid 4 copolymer
Emulsion Liquid 5 Emulsion Liquid 6 Aqueous solution Aqueous
Solution 1 Component (C) Propylene glycol 10 10 10 10 10 10 Other
components 10% SF 104 PG 0.4 0.4 0.4 0.4 0.4 0.4 Proxel GXL 0.3 0.3
0.3 0.3 0.3 0.3 Deionized water 15.3 15.3 15.3 15.3 15.3 81.3 Total
200 200 200 200 200 200
TABLE-US-00003 TABLE 3 Examples Ink dispersion composition 14 15 16
17 18 19 Component (A): Or25 30 30 dye and/or pigment R60 30 B360
30 B359 30 Y54 30 B77 Component (B): Emulsion Liquid 1 emulsition
liquid Emulsion Liquid 2 containing styrene- Emulsion Liquid 3
(meth)acrylic Emulsion Liquid 4 copolymer Emulsion Liquid 5 120 120
90 60 85 Emulsion Liquid 6 85 Aqueous solution Aqueous Solution 1
Component (C) Propylene glycol 10 10 10 10 10 10 Other components
10% SF 104 PG 0.4 0.4 0.4 0.4 0.4 0.4 Proxel GXL 0.3 0.3 0.3 0.3
0.3 0.3 Deionized water 39.3 39.3 69.3 99.3 74.3 74.3 Total 200 200
200 200 200 200
TABLE-US-00004 TABLE 4 Comparative Examples Components 1 2 3 4
Component (A): Or25 30 dye and/or pigment R60 30 B360 30 Y54 30
Component (B): Emulsion Liquid 1 emulsition liquid Emulsion Liquid
2 containing styrene- Emulsion Liquid 3 (meth)acrylic Emulsion
Liquid 4 copolymer Aqueous solution Aqueous Solution 1 44 44 44 44
Component (C) Propylene glycol Other components 10% SF 104 PG 0.4
0.4 0.4 0.4 Proxel GXL 0.3 0.3 0.3 0.3 Deionized water 125.3 125.3
125.3 125.3 Total 200 200 200 200
TABLE-US-00005 TABLE 5 Examples Ink dispersion composition 20 21 22
23 24 25 26 Component (A): Or25 30 30 30 dye and/or pigment R60 30
30 Y54 30 30 Component (B): Emulsion Liquid 1 120 100 120
emulsition liquid Emulsion Liquid 2 100 120 containing styrene-
Emulsion Liquid 3 120 120 (meth)acrylic copolymer Aqueous solution
Aqueous Solution 1 Component (D) Taurine 30 30 30 30 20 Component
(C) Propylene glycol 10 10 10 10 10 Other components 10% SF 104 PG
0.4 0.4 0.4 0.4 0.4 0.4 0.4 Proxel GXL 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Deionized water 9.3 9.3 29.3 9.3 39.3 49.3 49.3 Total 200 200 200
200 200 200 200
TABLE-US-00006 TABLE 6 Comparative Examples Components 5 6
Component (A): Or25 30 dye and/or pigment R60 30 Y54 Component (B):
Emulsion Liquid 1 emulsition liquid Emulsion Liquid 2 containing
styrene- Emulsion Liquid 3 (meth)acrylic copolymer Aqueous solution
Aqueous Solution 1 44 44 Component (D) Taurine Component (C)
Propylene glycol Other components 10% SF 104 PG 0.4 0.4 Proxel GXL
0.3 0.3 Deionized water 125.3 125.3 Total 200 200
[0173] The numbers in the tables each represent "the number of
parts", and the abbreviations are as follows.
[0174] Or25: C.I. Disperse Orange 25
[0175] R60: C.I. Disperse Red 60
[0176] B360: C.I. Disperse Blue 360
[0177] B359: C.I. Disperse Blue 359
[0178] Y54: C.I. Disperse Yellow 54
[0179] B77: C.I. Disperse Blue 77
[0180] 10% SF 104 PG: Surfynol 104 diluted to 10% concentration
with propylene glycol
[0181] Surfynol 104: an acetylene glycol surfactant (manufactured
by Air Products and Chemicals, Inc.), a defoamer
[0182] Proxel GXL: a preservative (manufactured by Lonza)
[0183] [Evaluation Results]
[0184] For Examples 1 to 26 and Comparative Examples 1 to 6, the
following tests were conducted and summarized in Tables 7 to
12.
[0185] [Particle Size Change Test for Confirmation of Sedimentation
Properties]
[0186] The median diameter (D50, number-average particle size) of
the colorant (component (A)) in each ink composition in an initial
state and after stored for 1 week at 60.degree. C. was measured
with MICRO TRAC UPA EX150 (manufactured by Microtrac Bel).
[0187] The presence or absence of sediment was visually confirmed
for each ink dispersion composition after stored at 60.degree. C.
for 1 week, and the evaluation was made on the basis of the
following criteria.
[0188] Good: No sedimentation occurred.
[0189] Fair: Slight sedimentation occurred.
[0190] Poor: Significant sedimentation occurred.
[0191] When observed with STEM (Scanning Transmission Electron
Microscope), it was found that each of our examples yielded an ink
dispersion composition containing dyes and a styrene-(meth)acrylic
copolymer and having a core-shell structure with the dyes as the
core layer and the styrene-(meth)acrylic copolymer as the shell
layer, whereas in any of comparative examples, such a core-shell
structure was not formed by the dyes and the styrene-(meth)acrylic
copolymer in the ink dispersion composition.
TABLE-US-00007 TABLE 7 Examples 1 2 3 4 5 6 7 Particle size D50
(nm) 102 114 97 132 122 87 120 [initial] Particle size D50 (nm) 168
176 120 167 151 98 150 [60.degree. C., 1 week] Sedimentation Good
Good Good Good Good Good Good properties
TABLE-US-00008 TABLE 8 Examples 8 9 10 11 12 13 Particle size D50
(nm) 106 131 107 97 109 105 [initial] Particle size D50 (nm) 109
140 155 121 166 133 [60.degree. C., 1 week] Sedimentation
properties Good Good Fair Fair Fair Fair
TABLE-US-00009 TABLE 9 Examples 14 15 16 17 18 19 Particle size D50
(nm) 107 117 98 159 114 115 [initial] Particle size D50 (nm) 166
120 102 151 126 203 [60.degree. C., 1 week] Sedimentation
properties Good Good Good Good Good Fair
TABLE-US-00010 TABLE 10 Comparative Examples 1 2 3 4 Particle size
D50 (nm) 97 88 101 125 [initial] Particle size D50 (nm) 540 188 140
188 [60.degree. C., 1 week] Sedimentation properties Poor Poor Poor
Poor
TABLE-US-00011 TABLE 11 Examples 20 21 22 23 24 25 26 Particle size
D50 (nm) 103 100 103 110 105 105 110 [initial] Particle size D50
(nm) 116 117 122 145 105 110 118 [60.degree. C., 1 week]
Sedimentation Good Good Good Good Good Good Good properties
TABLE-US-00012 TABLE 12 Comparative Examples 5 6 Particle size D50
(nm) 97 88 [initial] Particle size D50 (nm) 540 188 [60.degree. C.,
1 week] Sedimentation properties Poor Poor
[0192] From the above results, in each of Examples 1 to 26, there
was no large change in the particle size, and the storage stability
was excellent. On the other hand, in each of Comparative Examples 1
to 6, an increase in particle size was observed.
[0193] From the above, it was found that all of the inks of our
examples are excellent in dispersion stability. On the other hand,
all of the comparative examples were inferior in dispersion
stability.
[Examples 27 to 33 and Comparative Examples 7 to 10]--Preparation
of Ink Composition--
[0194] The ink dispersion compositions prepared in the above
Examples and Comparative Examples were further mixed with the
components listed in Tables 13 to 14 to obtain ink
compositions.
TABLE-US-00013 TABLE 13 Examples Ink composition 27 28 29 30 31 32
33 Composition of Example 3 (containing Or25) 30 5 Composition of
Example 8 (containing Y54) 30 10 Composition of Example 5
(containing R60) 30 5 Composition of Example 6 (containing B360) 30
10 Composition of Example 7 (containing B359) 30 Composition of
Example 9 (containing B77) 30 Aqueous Solution 1 Emulsion Liquid 3
10 10 10 10 10 10 10 Diglycerin S 10 10 10 10 10 10 10 Surfynol 420
0.3 0.3 0.3 0.3 0.3 0.3 0.3 Deionized water 49.7 49.7 49.7 49.7
49.7 49.7 49.7 Total 100 100 100 100 100 100 100
TABLE-US-00014 TABLE 14 Comparative Examples Ink composition 7 8 9
10 Composition of Comparative Example 1 (containing Or25) 30
Composition of Comparative Example 4 (containing Y54) 30
Composition of Comparative Example 2 (containing R60) 30
Composition of Comparative Example 3 (containing B360) 30 Aqueous
Solution 1 10 10 10 10 Diglycerin S 10 10 10 10 Surfynol 420 0.3
0.3 0.3 0.3 Deionized water 49.7 49.7 49.7 49.7 Total 100 100 100
100
[0195] The numbers in the tables each represent "the number of
parts", and the abbreviations are as follows.
[0196] Diglycerin S: a compound represented by formula (5), where s
is 2 and the glycerin content is 0.5%, manufactured by Sakamoto
Yakuhin Kogyo Co., Ltd.
[0197] Surfynol 420: a surfactant, manufactured by Nissin Chemical
Industry Co., Ltd.
[0198] [Evaluation Results]
[0199] Examples 27 to 33 and Comparative Examples 7 to 10 were
evaluated for sedimentation properties with the above-described
method, and the evaluation results are summarized in Tables 15 to
16.
TABLE-US-00015 TABLE 15 Examples 27 28 29 30 31 32 33 Particle size
D50 (nm) 110 100 120 110 100 97 98 [initial] Particle size D50 (nm)
140 135 120 145 135 128 133 [60.degree. C., 1 week] Sedimentation
Good Good Good Good Good Good Good properties
TABLE-US-00016 TABLE 16 Comparative Examples 7 8 9 10 Particle size
D50 (nm) 98 98 110 99 [initial] Particle size D50 (nm) 280 134 188
145 [60.degree. C., 1 week] Sedimentation properties Poor Fair Fair
Fair
[0200] From the above results, in each of our examples, neither
sedimentation nor a significant change in particle size was
observed, and the storage stability was excellent. On the other
hand, in each of the comparative examples, sedimentation was
observed and, in Comparative Example 8, separation of the
dispersion liquid occurred.
[0201] From the above, it was found that all of the inks of our
examples are excellent in dispersion stability. On the other hand,
all of the comparative examples were inferior in dispersion
stability.
[0202] [Emulsion Liquid 7]
[0203] To 48% sodium hydroxide (3.1 parts), deionized water (96.9
parts), and dipropylene glycol (a compound represented by formula
(1) with t=2) (60 parts) was added 40 parts of Joncryl 678 (a
styrene-(meth) acrylic copolymer having in its molecule a skeleton
of formula (2) with a weight-average molecular weight of 8,500, a
glass transition temperature of 85.degree. C., and an acid value of
215 mg KOH/g), the mixture was then stirred at raised temperatures
of 90-120.degree. C. for 5 hours, and an emulsion liquid 7 of
Joncryl 678 was obtained.
[Example 34]--Preparation of Ink Dispersion Composition--
[0204] Glass beads having a diameter of 0.2 mm were added to the
mixtures of the components listed in Table 17, and dispersion
treatment was carried out for about 15 hours in a sand mill under
water cooling. Deionized water was added to each obtained liquid so
that the content of dyes in the total mass of the liquid was
adjusted to 15%. The resulting liquids were respectively filtered
through glass fiber filter paper GC-50 (manufactured by ADVANTEC
Co., Ltd.) to obtain ink dispersion compositions of our
examples.
TABLE-US-00017 TABLE 17 Example Ink dispersion composition 34
Component (A): R60 30 dye and/or pigment Component (B): Emulsion
Liquid 7 78 emulsition liquid containing styrene- (meth)acrylic
copolymer Component (C) Dipropylene glycol 5 Other components 10%
SF 104 PG 0.4 Proxel GXL 0.3 Deionized water 86.3 Total 200
[0205] The numbers in the table represent "the number of
parts".
[0206] R60: C.I. Disperse Red 60
[0207] 10% SF 104 PG: Surfynol 104 diluted to 10% concentration
with propylene glycol
[0208] Surfynol 104: an acetylene glycol surfactant (manufactured
by Air Products and Chemicals, Inc.), a defoamer
[0209] Proxel GXL: a preservative (manufactured by Lonza)
[0210] [Evaluation Results]
[0211] Example 34 was evaluated for sedimentation properties with
the above-described method, and the evaluation results are
summarized in Table 18.
TABLE-US-00018 TABLE 18 Example 34 Particle size D50 (nm) 120
[initial] Particle size D50 (nm) 136 [60.degree. C., 1 week]
Sedimentation properties Good
[0212] From the above results, also in Example 34, neither
sedimentation nor a significant change in particle size was
observed, and the storage stability was excellent.
INDUSTRIAL APPLICABILITY
[0213] The ink emulsion composition and the water-based ink
composition according to the disclosure have high storage stability
and are very useful particularly for water-based ink in inkjet
applications.
* * * * *