JP2018150398A - Ink composition for inkjet printing and printing method of hydrophobic fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink composition for inkjet printing which is excellent in storage stability and continuous printing stability, does not impose a burden on a head by maintenance of wiping with solidified ink, is excellent in printing environment and a printer apparatus, and can obtain a good printed article.SOLUTION: An ink composition for inkjet printing contains (A) an organic acid having a lactone structure such that one or more hydroxyl groups are converted into alkali chloride in an organic acid having a lactone structure having the hydroxyl group as a substituent, (B) a coloring agent, and (C) a styrene-(meth)acrylic copolymer.SELECTED DRAWING: None

Description

  The present invention relates to an ink composition for inkjet printing and a method for printing hydrophobic fibers using the same.

In recent years, a recording method for performing plateless printing by ink jet has been proposed, and ink jet textile printing is also performed for textile printing including cloth. Compared with conventional printing methods such as screen printing, printing by ink-jet printing has various methods such as non-plate making; resource saving; energy saving; and easy high-definition expression. There are advantages.
Here, the hydrophobic fiber cloth such as polyester fiber is generally dyed with a water-insoluble coloring material. Therefore, as a water-based ink for printing hydrophobic fibers by the ink jet recording method, it is generally necessary to use a dispersed ink in which a water-insoluble colorant is dispersed in water and performance such as dispersion stability is good.

  Inkjet printing methods for hydrophobic fibers typified by polyester fibers are roughly divided into the following two methods. After directly applying (printing) the ink to the fiber, the ink is applied to the intermediate recording medium (dedicated transfer paper, etc.) and the direct printing method in which the dye in the ink is dyed on the fiber by heat treatment such as high-temperature steaming (printing) ), And after superposing the ink application surface of the intermediate recording medium and the hydrophobic fiber, the dye is transferred from the intermediate recording medium to the fiber side by heat.

The sublimation transfer method is mainly used for textile printing such as a banner, and an easily sublimation type dye excellent in transferability to polyester by heat treatment is used in the ink. The processing steps are (1) printing step: applying dye ink to the intermediate recording medium by an ink jet printer (2) transfer step: transferring and dyeing the dye from the intermediate recording medium into the fiber by heat treatment, Since commercially available transfer paper can be widely used, fiber pretreatment is not required and the washing step is omitted.

  Ink-jet inks used in the sublimation transfer method are mainly water-based inks. Sublimation dyes selected from water-insoluble disperse dyes and oil-soluble dyes are dispersed in water using a dispersant. Water-soluble organic solvents as moisturizers (anti-drying agents), surfactants as surface tension modifiers, and other additives (pH adjusters, antiseptic / antifungal agents, antifoaming agents, etc.) Is used to optimize ink physical properties (physical properties) such as particle size, viscosity, surface tension, and pH (see Patent Document 1).

  In ink jet printing, it is important that ink can be stably ejected from the plate on which the nozzles of the print head are arranged. However, in water-based ink, there is a problem of ejection caused by evaporation of water in the ink near the nozzle plate. It is easy to happen.

  As such an ejection problem, when the ink composition adheres and dries on the plate, it cannot cause the ink composition to be removed promptly by the cleaning operation of the printer, causing an ink ejection failure (such as a flying curve) during printing. There is.

  Therefore, various moisturizing agents are used for the purpose of suppressing evaporation of moisture in the ink, and many use water-soluble organic solvents. In particular, glycerin having a high water retention effect is used as the water-soluble organic solvent. However, the use of glycerin alone increases the tendency of ink thickening when water evaporates, so glycol solvents (ethylene glycol, propylene glycol, diethylene glycol, etc.) are used in combination to moderate the thickening tendency ( Patent Document 1).

  In the textile printing method of hydrophobic fibers in the sublimation transfer method, sublimation transfer ink is applied (printed) to an intermediate recording medium (dedicated transfer paper, etc.) by an ink jet printer, and the ink application (printing) surface of the intermediate recording medium and the surface to be dyed Sublimation dyes are transferred to an object to be dyed by a thermocompression bonding method using a thermocompression roller, a heat press, or the like on a superposed object (polyester fiber or the like).

  Examples of using diglycerin and polyglycerin as the water-soluble organic solvent used in the above prior art include diglycerin, polyglycerin and alkanediols having 3 to 5 carbon atoms, and polypropylene glycol having a molecular weight of 200 to 700. Although there is an ink for ink jet textile printing used (see Patent Document 4), there is an example in which diglycerin, polyglycerin and a glycol solvent are used together as an ink-forming solvent in this technology, but untreated in the direct printing method Although mention is made of the effect of preventing bleeding between the inks applied to the cloth, there is no test or description that it can be used in the sublimation transfer method.

  In addition, there is an ink jet pigment ink using polyethylene glycol and / or diglycerin (see Patent Document 5). In this technology, the redispersibility of water-soluble pigment ink is mentioned, but technical studies on sublimation dyes are also conducted. It has not been.

WO2005 / 121263 Japanese Patent No. 351579 Japanese Patent No. 3573156 JP 2007-238687 A JP 2004-107631 A JP 2011-21133 A JP 2011-246570 A WO1999-050363 Japanese Patent No. 4815747 JP 2010-235828 A Japanese Patent Publication No. 2002-228379 Japanese Patent Publication No. 2007-026047 Japanese Patent Publication No. 2007-026048 JP 63-139959 A JP 63-139960 A Japanese Unexamined Patent Publication No. 63-139961 Japanese Unexamined Patent Publication No. 63-13962

  The present invention is excellent in storage stability and continuous printing stability, and is capable of obtaining a good printed product that is gentle to the printing environment and printer equipment without causing a burden on the head due to the maintenance of wiping due to the solidified ink. It is an object to provide an ink composition.

  As a result of intensive studies to solve the problems as described above, the present inventors have (A) a lactone structure in which one or more hydroxyl groups are alkali-chlorinated in an organic acid having a lactone structure having a hydroxyl group as a substituent. It was found that an ink composition for inkjet textile printing containing an organic acid, (B) a colorant, and (C) a styrene- (meth) acrylic copolymer solves the above-mentioned problems, thereby completing the present invention. It is a thing.

That is, the present invention relates to the following 1) to 16).
1)
(A) An organic acid having a lactone structure having a hydroxyl group as a substituent, an organic acid having a lactone structure in which one or more hydroxyl groups are alkali-chlorinated, (B) a colorant, (C) styrene- (meth) acrylic copolymer An ink composition for ink jet printing containing a coalescence.
2)
(A) The ink composition for ink jet textile printing according to 1), wherein in the organic acid having a lactone structure having a hydroxyl group as a substituent, an organic acid having a lactone structure in which one hydroxyl group is alkali-chlorinated.
3)
(A) The ink composition for ink-jet printing according to 2), wherein in the organic acid having a lactone structure having a hydroxyl group as a substituent, the organic acid has a lactone structure in which one hydroxyl group is sodium chloride.
4)
(A) For inkjet printing according to 3), in the organic acid having a lactone structure having a hydroxyl group as a substituent, the organic acid having a lactone structure in which one hydroxyl group is sodium chloride is sodium L-ascorbate or sodium erythorbate Ink composition.
5)
(B) The ink composition for inkjet textile printing according to any one of 1) to 4), wherein the colorant is a sublimable dye.
6)
(B) The colorant is C.I. I. Disperse Yellow, C.I. I. Disperse orange, C.I. I. Disperse Blue and C.I. I. The ink composition for inkjet textile printing according to 5), which is a dye selected from the group consisting of disperse threads.
7)
(B) The colorant is C.I. I. Disperse Yellow 54, C.I. I. Disperse Orange 25, C.I. I. Disperse Blue 360, C.I. I. The ink composition for ink-jet printing according to 6), which is a dye selected from the group consisting of Disperse Red 60.
8)
(C) The ink composition for inkjet textile printing according to any one of 1) to 7), wherein the styrene- (meth) acrylic copolymer has a weight average molecular weight of 1,000 to 20,000.
9)
(C) The ink composition for inkjet textile printing according to any one of 1) to 8), wherein the styrene- (meth) acrylic copolymer has a weight average molecular weight of 2,000 to 19,000.
10)
(C) The ink composition for inkjet textile printing according to any one of 1) to 9), wherein the styrene- (meth) acrylic copolymer has a weight average molecular weight of 4,000 to 17,000.
11)
Furthermore, the ink composition for inkjet textile printing as described in any one of 1) thru | or 10) containing a water-soluble organic solvent.
12)
Furthermore, the ink composition for inkjet textile printing as described in any one of 1) to 11) containing water.
13)
In step A, the droplets of the ink composition for ink jet textile printing according to any one of 1) to 12) are attached to a hydrophobic fiber by an ink jet printer, and in the droplets of the ink composition attached in step A A method for printing hydrophobic fibers, comprising: a step B for fixing the colorant to the fiber by heat; and a step C for washing the unfixed colorant remaining in the fiber.
14)
After the droplets of the ink composition for ink jet textile printing according to any one of 1) to 12) are attached to an intermediate recording medium by an ink jet printer to obtain a recorded image, the ink composition in the intermediate recording medium A method for printing a hydrophobic fiber, wherein the recorded image is transferred to the hydrophobic fiber by bringing the hydrophobic fiber into contact with the surface to which the droplets are attached and heat-treating it.
15)
13) or 14) further including a fiber pretreatment step of applying an aqueous solution containing one or more types of paste material, an alkaline substance, an anti-reduction agent, and a hydrotropic agent to the fiber before the ink composition is attached. Printing method for hydrophobic fibers.
16)
A dyed hydrophobic fiber obtained by the method for printing a hydrophobic fiber according to any one of 13) to 15).

  According to the present invention, an ink jet can be obtained that is friendly to the environment and the printer, and does not cause a printhead clogging or ejection failure, and does not impose a burden on the head due to solidified ink, and does not impose a burden on the head. An ink composition for textile printing is obtained.

  Hereinafter, the present invention will be described in detail. In the present specification, “part” and “%” are based on mass unless otherwise specified, including examples and the like.

  The ink composition for ink jet textile printing includes (A) an organic acid having a lactone structure having a hydroxyl group as a substituent, an organic acid having a lactone structure in which one or more hydroxyl groups are alkali-chlorinated, (B) a colorant, (C ) A styrene- (meth) acrylic copolymer is contained.

[Ingredient (A)]
The component (A) contained in the ink composition for ink jet textile printing is an organic acid having a lactone structure in which one or more hydroxyl groups are alkali-chlorinated in an organic acid having a lactone structure having a hydroxyl group as a substituent.

  Examples of the organic acid having a lactone structure having a hydroxyl group as a substituent include L-ascorbic acid (also called vitamin C) and erythorbic acid.

  In the lactone structure organic acid having a hydroxyl group as a substituent, one or more hydroxyl groups are alkali-chlorinated, and one hydroxyl group is preferably alkali-chlorinated, and one hydroxyl group is sodium-chlorinated. Further preferred.

The organic acid having a lactone structure having one or more hydroxyl groups alkali-chlorinated as a substituent as a substituent is generally 5 to 10% on a mass basis (mass%) based on the total mass of the aqueous ink composition. Preferably it is 1.0-5.0%, More preferably, it is 1.0-0.01%.

The alkali salification can be performed, for example, by the following method.
An organic acid having a lactone structure having a hydroxyl group as a substituent is added to water and stirred to prepare an aqueous solution. Thereto, an alkaline compound such as sodium hydroxide is added to prepare a liquid whose pH is adjusted to 6.0 to 12.0. An object is to prepare an ink composition containing this liquid.

  The organic acid having a lactone structure having the hydroxyl group as a substituent needs to use an alkaline compound in order to alkalinely salify one or more hydroxyl groups. Examples of the alkaline compound include alkali metal hydroxides, alkaline earth metal hydroxides, aliphatic amine compounds, and alcohol amine compounds.

  Examples of the alkali metal hydroxide include lithium hydroxide, sodium hydroxide, and potassium hydroxide. Examples of alkaline earth metal hydroxides include beryllium hydroxide, magnesium hydroxide, calcium hydroxide, and strontium hydroxide, preferably alkali metal hydroxides, more preferably lithium hydroxide. And sodium hydroxide.

  Examples of the aliphatic amine compound include ammonia, monomethylamine, dimethylamine, trimethylamine, monoethylamine, dimethylamine and trimethylamine, with ammonia or triethylamine being preferred.

  Examples of the alcohol amine compound include monoethanolamine, diethanolamine, triethanolamine, monopropanolamine, dipropanolamine, tripropanolamine, methylethanolamine, dimethylethanolamine and N-methyldiethanolamine, preferably tertiary amine. More preferably, it is triethanolamine.

  One kind of these alkaline compounds may be used, or two or more kinds may be combined.

[Ingredient (B)]
The component (B) contained in the ink composition for ink jet textile printing is a colorant. Examples of the colorant that can be used include dyes and / or pigments. The above dyes are organic dyes that are dyed on fibers by an appropriate dyeing method, such as direct dyes, vat dyes, sulfur dyes, disperse dyes, basic dyes, naphthol dyes, acid dyes, acid mordant dyes, mordant dyes. Oil-soluble dyes, reactive dyes, soluble vat dyes, sulfur vat dyes, and oxidation dyes.
Specifically, C.I. I. Disperse Yellow 3, 4, 5, 6, 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, 142, 149, 160, 162, 163, 164, 165, 179, 180, 182, 183, 186, 192, 198, 199, 200, 202, 204, 210, 211, 215, 216, 218, 224, 237, C.I. I. Disperse Orange 1, 1: 1, 3, 5, 7, 11, 13, 17, 20, 21, 23, 25, 29, 30, 31, 32, 33, 37, 38, 42, 43, 44, 45 47, 48, 49, 50, 53, 54, 55, 56, 57, 58, 59, 60, 61, 66, 71, 73, 76, 78, 80, 86, 89, 90, 91, 93, 96 97, 118, 119, 127, 130, 139, 142, C.I. I. Disperse thread 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, 22 1, 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, C.I. I. Disperse violet 1, 4, 8, 11, 17, 23, 26, 27, 28, 29, 31, 33, 35, 36, 38, 40, 43, 46, 48, 50, 51, 52, 56, 57 59, 61, 63, 69, 77, 97, C.I. I. Disperse Green 9, C.I. I. Disperse Brown 1, 2, 4, 9, 13, 19, C.I. 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, 82, 83, 87, 91, 93, 94, 95, 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, 26 267, 270, 281, 284, 285, 287, 288, 291, 293, 295, 297, 301, 315, 330, 333, 341, 353, 354, 358, 360, 364, 365, 366, 368, C . I. Disperse black 1, 3, 10, 24, C.I. I. Solvent Yellow 114, C.I. I. Solvent Orange 67, C.I. I. Solvent Red 146, C.I. I. Solvent Blue 36, 63, 83, 105, 111, C.I. I. Reactive Yellow 2, 3, 18, 81, 84, 85, 95, 99, 102, C.I. I. Reactive Orange 5, 9, 12, 13, 35, 45, 99, C.I. I. Reactive Brown 2, 8, 9, 17, 33, C.I. I. Reactive bread 3, 3: 1, 4, 13, 24, 29, 31, 33, 125, 151, 206, 218, 226, C.I. I. Reactive Violet 1, 24, C.I. I. Reactive Blue 2, 5, 10, 13, 14, 15, 15: 1, 49, 63, 71, 72, 75, 162, 176, C.I. I. Reactive Green 5, 8, 19, C.I. I. Reactive Black 1, 8, 23, 39, C.I. I. Acid Yellow 1, 3, 11, 17, 18, 19, 23, 25, 36, 38, 40, 42, 44, 49, 59, 61, 65, 72, 73, 79, 99, 104, 110, 159, 169, 176, 184, 193, 200, 204, 207, 215, 219, 220, 230, 232, 235, 241, 242, 246, C.I. I. Acid Orange 2, 3, 7, 8, 10, 19, 24, 51, 56, 67, 74, 80, 86, 87, 88, 89, 94, 95, 107, 108, 116, 122, 127, 140, 142, 144, 149, 152, 156, 162, 166, 168, C.I. I. Acid Brown 2, 4, 13, 14, 19, 28, 44, 123, 224, 226, 227, 248, 282, 283, 289, 294, 297, 298, 301, 355, 357, 413, C.I. I. Acid Red 1, 6, 8, 9, 13, 18, 27, 35, 37, 52, 54, 57, 73, 82, 88, 97, 106, 111, 114, 118, 119, 127, 131, 138, 143, C.I. I. Acid Violet 17, 19, 21, 42, 43, 47, 48, 49, 54, 66, 78, 90, 97, 102, 109, 126, C.I. I. Acid Blue 1, 7, 9, 15, 23, 25, 40, 62, 72, 74, 80, 83, 90, 92, 103, 104, 112, 113, 114, 120, 127, 128, 129, 138, 140, 142, 156, 158, 171, 182, 185, 193, 199, 201, 203, 204, 205, 207, 209, 220, 221, 224, 225, 229, 230, 239, 249, 258, 260, H.264, 278, 279, 280, 284, 290, 296, 298, 300, 317, 324, 333, 335, 338, 342, 350, C.I. I. Acid Green 9, 12, 16, 19, 20, 25, 27, 28, 40, 43, 56, 73, 81, 84, 104, 108, 109, C.I. I. Acid Black 1, 2, 3, 24, 26, 31, 50, 52, 58, 60, 63, 107, 109, 112, 119, 132, 140, 155, 172, 187, 188, 194, 207, 222, C. I. Direct Yellow 2, 3, 4, 9, 10, 11, 12, 13, 15, 16, 50, 66, 73, 84, 86, 87, 88, 89, 91, 110, 127, 128, 129, 130, 132, 138, 139, 141, 142, 145, C.I. I. Direct Orange 20, 25, 35, 38, 39, 41, C.I. I. Direct Brown 187, 195, 196, 202, 208, 209, 210, 213, C.I. I. Direct Red 76, 88, 89, 92, 101, 209, 220, 222, 224, 225, 226, 227, 234, 235, 238, 240, 243, 245, 247, C.I. I. Direct Blue 52, 55, 57, 76, 80, 84, 86, 87, 92, 102, 105, 106, 108, 110, 112, 197, 199, 200, 202, 205, 220, 231, 233, 235, 237, 238, 240, 245, 248, 250, C.I. I. Direct Green 55, 57, 59, 60, 77, 80, 82, 90, C.I. I. Direct Black 12, 19, 20, 22, 23, 105, 107, 110, 112, 115, 117, 120, 125, 129, 132, 135, 136, C.I. I. Basic yellow 2, 3, 18, 21, 38, 40, 41, 43, 51, 63, 65, 67, 69, C.I. I. Basic Blue 2, 10, 37, 41, 43, 50, 55, 57, 60, 66, 69, 72, 75, 79, C.I. I. Basic Red 20, 25, 27, 29, 31, 45, 46, 47, 50 and the like can be mentioned, but are not limited thereto.

  Among these dyes, preferred as disperse dyes and oil-soluble dyes are C.I. I. Disperse Yellow 42, 49, 76, 83, 88, 93, 99, 119, 126, 160, 163, 165, 180, 183, 186, 198, 199, 200, 224, 237, C.I. I. Disperse orange 25, 29, 30, 31, 38, 42, 44, 45, 53, 54, 55, 71, 73, 80, 86, 96, 118, 119, C.I. I. Disperse thread 73, 88, 91, 92, 111, 127, 131, 143, 145, 146, 152, 153, 154, 179, 191, 192, 206, 221, 258, 283, 302, 323, 328, 359, C. I. Disperse violet 26, 35, 48, 56, 77, 97, C.I. I. Disperse Blue 27, 54, 60, 73, 77, 79, 79: 1, 87, 143, 165, 165: 1, 165: 2, 181, 185, 197, 225, 257, 266, 267, 281, 341 353, 354, 358, 360, 364, 365, 368 and the like. Preferred dyes suitable for thermal transfer include C.I. I. Disperse Yellow 51, 54, 60, 82, C.I. I. Disperse orange 5, 7, 20, 23, 25, C.I. I. Disperse thread 4, 11, 50, 53, 59, 60, 239, 240, 364, C.I. I. Disperse violet 8, 11, 17, 26, 27, 28, 36, C.I. I. Disperse Blue 3, 5, 26, 35, 55, 56, 72, 81, 91, 108, 334, 359, 360, 366, C.I. I. Disperse Brown 27, C.I. I. Solvent Yellow 114, C.I. I. Solvent Orange 60, 67, C.I. I. Solvent Red 146, C.I. I. Solvent Blue 36, 63, 83, 105, 111, and the like. Among these, C.I. I. Disperse Orange 25, C.I. I. Disperse Yellow 54, C.I. I. Disperse thread 60, C.I. I. Disperse Blue 360.

  In addition, a plurality of the above dyes may be blended. For example, in the preparation of a black ink, an orange dye and a red dye mainly composed of a blue dye are appropriately blended to adjust a black color, and this is used as a black dye. be able to. Further, for example, a plurality of dyes may be blended for the purpose of finely adjusting the color tone such as blue, orange, red, violet, or black to a more preferable color tone.

The pigment is a white or colored powder insoluble in water, an organic solvent, or the like, and includes an organic pigment and an inorganic pigment. In the present invention, an organic pigment or an inorganic pigment may be used, but an organic pigment is preferred. Specifically, C.I. I. Pigment yellow 74, 120, 128, 138, 151, 185, 217, C.I. I. Pigment orange 13, 16, 34, 43, C.I. I. Pigment red 122, 146, 148, C.I. I. Pigment violet 19, 23, C.I. I. Pigment blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 5, 15: 6, C.I. I. Pigment Green 7, 8 and the like.
In the present invention, a dye is more preferable.

  These colorants may be powdery or lump dry color materials, wet cakes or slurries, and contain a small amount of a dispersant such as a surfactant for the purpose of suppressing aggregation of the color material particles during or after the color material synthesis. It may be a thing. These commercially available color materials include industrial dyeing grades, resin coloring grades, ink grades, toner grades, and inkjet grades, which differ in production method, purity, pigment particle size, and the like. In order to suppress the cohesiveness after pulverization, the color material preferably has smaller particles, and preferably has as few impurities as possible in view of the influence on dispersion stability and ink ejection accuracy. The dye can be used as a coloring material for black by blending an orange dye and a red dye mainly with a blue dye. A small amount of other water-insoluble colorant may be included within the range of color tone adjustment.

[Ingredient (C)]
The component (C) styrene- (meth) acrylic copolymer contained in the ink composition for ink jet textile printing is a copolymer of a styrene monomer and a (meth) acrylic monomer. In the present specification, “(meth) acryl” means “acryl” and / or “methacryl”. Specific examples of these copolymers include (α-methyl) styrene-acrylic acid copolymer, (α-methyl) styrene-acrylic acid-acrylic acid ester copolymer, (α-methyl) styrene-methacrylic acid copolymer. Polymer, (α-methyl) styrene-methacrylic acid-acrylic acid ester copolymer, (α-methyl) styrene- (anhydrous) maleic acid copolymer, acrylic acid ester- (anhydrous) maleic acid copolymer, ( α-methyl) styrene-acrylic acid ester- (anhydrous) maleic acid copolymer, acrylic acid ester-allylsulfonic acid ester copolymer, acrylic acid ester-styrenesulfonic acid copolymer, (α-methyl) styrene-methacrylic acid Sulfonic acid copolymer, polyester-acrylic acid copolymer, polyester-acrylic acid-acrylic acid ester copolymer, Ester - methacrylic acid copolymer, polyester - methacrylic acid - acrylic acid copolymer ester; and the like. Among these, the compound containing an aromatic hydrocarbon group is preferably styrene. In this specification, (α-methyl) styrene is used to mean α-methylstyrene and styrene.

Specific examples of the component (C) in the ink composition for inkjet textile printing include Joncryl ^RTM 52J, 57J, 60J, 63J, 70J, JDX-6180, HPD-196, HPD96J, PDX-6137A, 6610, JDX-6500, Examples thereof include, but are not limited to, JDX-6663, PDX-6102B, PDX-6124 (manufactured by BASF). In this specification, the superscript RTM means a registered trademark.

  As a component (C) in the said ink composition for inkjet textile printing, the case where a weight average molecular weight is 1,000-20,000 is preferable, 2,000-19,000 is still more preferable, 4,000-17, 000 is particularly preferred. The weight average molecular weight of the styrene-acrylic acid copolymer is measured by a GPC (gel permeation chromatograph) method. The glass transition temperature of the styrene- (meth) acrylic copolymer used as the component (C) is preferably 45 ° C to 135 ° C, more preferably 55 ° C to 120 ° C, and particularly preferably 60 ° C to 110 ° C. . Furthermore, the oxidation of the styrene- (meth) acrylic copolymer used as component (C) is preferably 50 to 250 mgKOH / g, more preferably 100 to 250 mgKOH / g, and sometimes 150 to 250 mgKOH / g. Particularly preferred. If the acid value is too small, the solubility of the resin in water will be poor, especially when the colorant is a dispersible dye or pigment, the dispersion stabilizing power tends to be inferior, and if the acid value is too large, This is not preferable because the affinity of the toner tends to increase and bleeding tends to occur in the printed image. The acid value of the resin represents the number of mg of KOH required to neutralize 1 g of the resin, and is measured according to JIS-K3054.

  Specific examples of the preferred component (C) styrene- (meth) acrylic copolymer in the ink composition for inkjet textile printing include Joncryl 67 (weight average molecular weight = 12,500, acid value = 213 mgKOH / g), 678. (Weight average molecular weight = 8,500, acid value = 215 mgKOH / g), 682 (weight average molecular weight = 1,700, acid value = 230 mgKOH / g), 683 (weight average molecular weight = 4,900, acid value = 215 mgKOH / g) g), 690 (weight average molecular weight = 16,500, acid value = 240 mgKOH / g), and the like, and Joncryl 678 is more preferable.

  The ink composition for ink jet textile printing can be prepared using two or more kinds of styrene-acrylic copolymers when the colorant is dispersed or dissolved.

  The colorant can be dispersed, for example, by the following method. The styrene-acrylic copolymer is charged into a water-soluble organic solvent, the temperature is raised to 90-120 ° C. to prepare a styrene-acrylic copolymer solution, and an alkaline compound and water are added thereto, and the temperature is increased. Is reduced to an emulsified (emulsion or microemulsion) liquid, and the prepared emulsion liquid and colorant are mixed and dispersed.

[Other ingredients]
In addition to the above (A) to (C), the ink composition for inkjet textile printing contains an ink adjusting agent such as a water-soluble organic solvent, an antiseptic, a water-soluble ultraviolet absorber, a pH adjusting agent, and water as other components. You may do it.

  The ink composition for ink jet textile printing may contain a water-soluble organic solvent for the purpose of preventing clogging at the nozzle. Specific examples of the water-soluble organic solvent include polyhydric alcohols and pyrrolidones. Examples of the polyhydric alcohols include C2 to C6 polyhydric alcohols having 2 to 3 alcoholic hydroxyl groups, and poly C2 having di or tri C2 to C3 alkylene glycol or repeating units of 4 or more and a molecular weight of about 20,000 or less. -C3 alkylene glycol, preferably liquid polyalkylene glycol and the like. Specific examples thereof include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, 1,3-propanediol, 1,2-butanediol, thiodiglycol, 1,3-butanediol, 1 , 4-butanediol, 2,3-butanediol, 3-methyl-1,3-butanediol, 1,2-pentanediol, 1,5-pentanediol, 2-methyl-2,4-pentanediol, 3 -Polyhydric alcohols such as methyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, glycerin, trimethylolpropane, 1,3-pentanediol, 1,5-pentanediol, 2-pyrrolidone, N-methyl-2-pyrrolidone And the like. In addition, a compound that dissolves in water and serves as a wetting agent is also included in the water-soluble organic solvent in the present invention for convenience, and examples thereof include urea, ethylene urea, and saccharides. In consideration of storage stability, when the colorant is a disperse dye or an oil-soluble dye, a solvent having low solubility is preferable. Among these, glycerol and a solvent other than glycerol (preferably a polyhydric alcohol other than glycerol) are preferable. It is preferable to use together. The total content of the water-soluble organic solvent in the total mass of the colored ink composition is 5 to 40%, preferably 10 to 30%.

The ink composition for ink jet textile printing may contain a preservative. Examples of preservatives include organic sulfur, organic nitrogen sulfur, organic halogen, haloallylsulfone, iodopropargyl, N-haloalkylthio, nitrile, pyridine, 8-oxyquinoline, benzothiazole. , Isothiazoline, dithiol, pyridine oxide, nitropropane, organotin, phenol, quaternary ammonium salt, triazine, thiazine, anilide, adamantane, dithiocarbamate, brominated indanone, Examples include benzyl bromacetate and inorganic salt compounds. Specific examples of the organic halogen compound include sodium pentachlorophenol, and specific examples of the pyridine oxide compound include sodium 2-pyridinethiol-1-oxide, and specific examples of the isothiazoline compound. For example, 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, 2-methyl-4-isothiazolin-3-one calcium chloride and the like. Specific examples of the other antiseptic / antifungal agents include anhydrous sodium acetate, sodium sorbate or sodium benzoate, trade names of Proxel ^RTM GXL (S) and Proxel ^RTM XL-2 (S) manufactured by Arch Chemical Co., Ltd.

  The ink composition for ink jet textile printing may contain a water-soluble ultraviolet absorber. Examples of the water-soluble ultraviolet absorber include sulfonated benzophenone compounds, benzotriazole compounds, salicylic acid compounds, cinnamic acid compounds, and triazine compounds.

  The ink composition for inkjet textile printing may contain a pH adjuster. Examples of the pH adjuster include alkali hydroxides such as sodium hydroxide, potassium hydroxide and lithium hydroxide, and tertiary amines such as triethanolamine, diethanolamine, dimethylethanolamine and diethylethanolamine.

  The ink composition for ink jet textile printing may contain water. The water used for preparing the ink is preferably water with few impurities such as ion exchange water and distilled water. In addition, microfiltration using a membrane filter or the like can be performed on the prepared ink. When the ink is used as an inkjet ink, it is preferable to perform microfiltration for the purpose of preventing clogging of nozzles and the like. The pore size of the filter used for microfiltration is usually 1 μm to 0.1 μm, preferably 0.8 μm to 0.1 μm.

  The method for preparing the ink composition for inkjet textile printing is not particularly limited, and examples thereof include a method of adding a colorant dispersion or solution and then adding an ink preparation such as a water-soluble organic solvent. As a method of preparing an aqueous dispersion of a colorant, each component constituting the dispersion is stirred and mixed using a sand mill (bead mill), a roll mill, a ball mill, a paint shaker, an ultrasonic disperser, a microfluidizer, or the like. There are known methods. Foaming may occur when preparing a colorant dispersion. For this reason, if necessary, an antifoaming agent such as silicone type; acetylene alcohol type, etc. may be added during the preparation of the dispersion. However, since some antifoaming agents inhibit the dispersion and micronization of dyes and the like, it is preferable to use those that do not affect the micronization and the stability of the dispersion. Preferable antifoaming agents include, for example, Olphine series (SK-14 etc.) manufactured by Nissin Chemical Industry Co., Ltd .; Surfynol series (104, DF-110D etc.) manufactured by Air Products Japan Ltd .; .

  The content of the colorant contained in the aqueous dispersion of the colorant is usually 10 to 60%, preferably 20 to 50% on a mass basis (% by mass), based on the total mass of the aqueous dispersion. More preferably, it is 20 to 40%. Similarly, the content of the dispersant is usually 1 to 36%, preferably 5 to 30%, more preferably 5 to 20%, and further preferably 5 to 15%.

  Examples of the method for preparing the ink composition for ink jet textile printing include a method in which the aqueous dispersion, the water-soluble organic solvent, and an ink preparation agent as necessary are added and mixed. The order in which these are mixed is not particularly limited. You may add these ink preparation agents in the range which does not inhibit the effect of this invention.

  The content of the aqueous dispersion contained in the ink composition for ink jet textile printing is usually 2 to 35%, preferably 3 to 30%, based on the mass based on the total mass of the aqueous ink composition. Preferably it is 5 to 30%. Similarly, the content of the aqueous organic solvent is usually 10 to 50%, preferably 15 to 50%, more preferably 20 to 50%, and still more preferably 30 to 50%. Similarly, the content of the ink preparation agent is usually 0 to 25%, preferably 0.01 to 20% in total of the ink adjusting agent with respect to the total mass of the aqueous ink composition.

  The ink composition for inkjet textile printing preferably has a viscosity at 25 ° C. of usually about 3 to 20 mPa · s when measured with an E-type viscometer from the viewpoint of high-speed ejection response. The surface tension is usually preferably in the range of 20 to 45 mN / m when measured by the plate method. In practice, it is preferable to adjust to an appropriate physical property value in consideration of the discharge amount, response speed, ink droplet flight characteristics, and the like of the printer to be used.

  The hydrophobic fiber printing methods are roughly classified into two types. The first method is a method called direct printing or direct textile printing. Image information such as characters and patterns is obtained by attaching droplets of the ink composition to hydrophobic fibers using an inkjet printer. Step A for forming the hydrophobic fiber, Step B for fixing the colorant in the droplets of the ink composition attached in Step A to the fiber by heat, and washing the unfixed colorant remaining in the fiber A method for printing hydrophobic fibers, comprising at least three steps of step C. Step B is generally performed by known steaming or baking. For steaming, for example, a high temperature steamer is usually 170 to 180 ° C., usually about 10 minutes; a high pressure steamer is usually 120 to 130 ° C., usually about 20 minutes; And a method of dyeing (also referred to as wet heat fixing). As baking (thermosol), for example, a method of dyeing a colorant on a fiber by a method of treating a hydrophobic fiber, usually from 190 ° C. to 210 ° C., usually from about 60 seconds to 120 seconds (also called dry heat fixing) Is mentioned. Step C is a step of washing the obtained fiber with warm water and, if necessary, water. The hot water or water used for cleaning may contain a surfactant. It is also preferable to dry the washed fibers usually at 50 to 120 ° C. for 5 to 30 minutes.

  The second method is a method called sublimation transfer printing, sublimation transfer printing, or the like. By applying droplets of the ink composition for ink jet printing to an intermediate recording medium by an ink jet printer, characters and pictures are printed. After the recording image is obtained, the hydrophobic recording medium is recorded on the intermediate recording medium by contacting the hydrophobic fibers with the surface of the ink composition on which the droplets of the ink composition are adhered and heat-treating the intermediate recording medium. This is a hydrophobic fiber printing method in which an image is transferred to a hydrophobic fiber. As the intermediate recording medium, the colorant in the ink composition attached to the intermediate recording medium does not aggregate on the surface, and does not interfere with the sublimation of the colorant when transferring the recorded image to the hydrophobic fiber. Is preferred. As an example of such an intermediate recording medium, paper having an ink receiving layer formed on the surface with inorganic fine particles such as silica can be used, and special paper for ink jet can be used. The heat treatment for transferring the recorded image from the intermediate recording medium to the hydrophobic fibers usually includes a dry heat treatment at about 190 to 200 ° C.

  The textile printing method may further include a fiber pretreatment step for the purpose of preventing bleeding and the like. Examples of the pretreatment step include a step of applying an aqueous solution containing at least one paste material, an alkaline substance, an anti-reduction agent, and a hydrotropic agent to fibers before the ink composition is attached. As the pretreatment step, it is preferable to apply an aqueous solution of a pretreatment agent containing a paste, an alkaline substance, a reduction inhibitor and a hydrotropic agent as a pretreatment liquid, and impregnate the fiber with the pretreatment liquid. Examples of the paste include natural gums such as guar and locust bean, starches, seaweeds such as sodium alginate and fungi, plant skins such as pectic acid, methyl fibrin, ethyl fibrin, hydroxyethylcellulose, carboxymethylcellulose, etc. Fiber derivatives, processed starches such as carboxymethyl starch, synthetic pastes such as polyvinyl alcohol and polyacrylates. Preferred is sodium alginate.

  Examples of the alkaline substance include an alkali metal salt of an inorganic acid or an organic acid; a salt of an alkaline earth metal; and a compound that liberates alkali when heated, and includes an inorganic or organic alkali metal hydroxide and alkali. Metal salts are preferred, and examples include sodium compounds and potassium compounds. Specific examples include, for example, alkali metal hydroxides such as sodium hydroxide and calcium hydroxide; inorganic compounds such as sodium carbonate, sodium bicarbonate, potassium carbonate, sodium dihydrogen phosphate, disodium hydrogen phosphate, and sodium phosphate And alkali metal salts of organic compounds such as sodium formate and sodium trichloroacetate. Preferably, sodium hydrogencarbonate is used. As the reduction inhibitor, sodium metanitrobenzenesulfonate is preferable. Examples of the hydrotropic agent include ureas such as urea and dimethylurea, preferably urea. A single compound may be used for each of the paste, alkaline substance, anti-reduction agent, and hydrotropic agent, or a plurality of compounds may be used in combination. The mixing ratio of each pretreatment agent in the total mass of the pretreatment liquid is, for example, on a mass basis, 0.5 to 5% paste, 0.5 to 5% sodium bicarbonate, metanitrobenzenesulfonic acid Sodium is 0 to 5%, urea is 1 to 20%, and the balance is water. Application of the pretreatment agent to the cellulosic fiber includes, for example, a padding method. The padding drawing ratio is preferably about 40 to 90%, more preferably about 60 to 80%.

  Specific examples of the hydrophobic fibers include polyester fibers, nylon fibers, triacetate fibers, diacetate fibers, polyamide fibers, and blended fibers using two or more of these fibers. In addition, in this specification, mixed fibers of these and recycled fibers such as rayon, and natural fibers such as cotton, silk, and wool are also included in the hydrophobic fibers. As these hydrophobic fibers, those having an ink receiving layer (bleeding prevention layer) are also known, and such hydrophobic fibers are also included. The method for forming the ink receiving layer is a known technique, and fibers having the ink receiving layer are also available as commercial products. The material, structure, and the like of the ink receiving layer are not particularly limited, and can be appropriately used depending on the purpose.

  The ink composition for ink jet textile printing can be used in various fields, but is suitable for water-based ink for writing, water-based printing ink, information recording ink, textile printing, etc., and particularly preferably used as ink for ink-jet textile printing.

  The ink composition for ink jet textile printing of the present invention is excellent in storage stability without solid precipitation, physical property change, color change and the like after long-term storage. Further, the initial filling property to the ink jet printer head is good, and the continuous printing stability is also good. Furthermore, it is possible to obtain a clear image without bleeding on the paper after printing, there is no odor on the paper after printing, and there is little influence on odors on the printed matter and the printing work environment. In addition to these, an image recorded with the ink composition for ink jet textile printing of the present invention has excellent ozone gas resistance, high printing density, low color rendering, low chroma, and high quality hue. Moreover, it is excellent also in various fastnesses, such as light resistance, moisture resistance, and water resistance. Furthermore, when used in combination with ink compositions containing yellow, orange, magenta, cyan, black dyes, etc., full-color ink jet printing with excellent fastness and storage stability is possible. As described above, the ink composition for ink jet textile printing of the present invention is particularly suitable as an ink for ink jet textile printing because of its excellent discharge stability.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by an Example.

[Example 1]
By mixing and stirring 25 parts of L-ascorbic acid (manufactured by Wako Pure Chemical Industries, Ltd.), 48% sodium hydroxide (5.90 parts) and ion-exchanged water (52.43 parts), 30% L- of pH 7.0 A sodium ascorbate aqueous solution was obtained.

[Preparation of emulsion liquid]
Charge 20 parts of Joncryl 678 (BASF) into 48% lithium hydroxide (3.2 parts), ion-exchanged water (56.8 parts) and propylene glycol (20 parts), and raise the temperature to 90-120 ° C. The mixture was stirred for 5 hours to obtain an emulsion solution of Joncryl 678.

[Example 2]
(Step 1-1)
C. I. Disperse Yellow 54 (30 parts), Joncryl 678 emulsion liquid (60 parts), Proxel GXL (0.2 parts), Surfynol 104PG50 (0.4 parts), ion-exchanged water (24 parts), The dispersion treatment was performed for about 15 hours under cooling with a sand mill using 0.2 mm diameter glass beads. After adding ion-exchanged water (60 parts) and Joncryl 678 emulsion liquid (30 parts) to the resulting liquid to adjust the dye content to 15%, glass fiber filter paper GC-50 (manufactured by Toyo Roshi Kaisha, Ltd., filter) Dispersion 1 was obtained by filtration with a pore size of 0.5 μm.
(Step 1-2)
C. I. Disperse Orange 25 (30 parts), Joncryl 678 emulsion liquid (60 parts), Proxel GXL (0.2 parts), Surfynol 104PG50 (0.4 parts), ion-exchanged water (24 parts), The dispersion treatment was performed for about 15 hours under cooling with a sand mill using 0.2 mm diameter glass beads. After adding ion-exchanged water (60 parts) and Joncryl 678 emulsion liquid (30 parts) to the resulting liquid to adjust the dye content to 15%, glass fiber filter paper GC-50 (manufactured by Toyo Roshi Kaisha, Ltd., filter) Dispersion 2 was obtained by filtration with a pore size of 0.5 μm.
(Step 1-3)
C. I. Disperse Blue 360 (30 parts), Joncryl 678 emulsion liquid (60 parts), Proxel GXL (0.2 parts), Surfynol 104PG50 (0.4 parts), ion-exchanged water (24 parts), The dispersion treatment was performed for about 15 hours under cooling with a sand mill using 0.2 mm diameter glass beads. After adding ion-exchanged water (60 parts) and Joncryl 678 emulsion liquid (30 parts) to the resulting liquid to adjust the dye content to 15%, glass fiber filter paper GC-50 (manufactured by Toyo Roshi Kaisha, Ltd., filter) The dispersion 3 was obtained by filtration with a pore size of 0.5 μm.
(Step 1-4)
C. I. A mixture consisting of 30 parts of Disperse Red 60, the above-mentioned Joncryl 678 emulsion (60 parts), Proxel GXL (0.2 parts), Surfynol 104PG50 (0.4 parts), and ion-exchanged water (24 parts) Dispersion treatment was performed for about 15 hours under cooling with a sand mill using 2 mm diameter glass beads. After adding ion-exchanged water (60 parts) and Joncryl 678 emulsion liquid (30 parts) to the resulting liquid to adjust the dye content to 15%, glass fiber filter paper GC-50 (manufactured by Toyo Roshi Kaisha, Ltd., filter) The dispersion 4 was obtained by filtration with a pore size of 0.5 μm.
[Example 3]

  Dispersion 1 (5 parts) obtained in Example 2, Dispersion 2 (15 parts), Dispersion 3 (15 parts), 20 parts of glycerin, 8 parts of propylene glycol, BYK-348 (manufactured by Big Chemie Japan, 0.2 parts of polyether-modified polydimethylsiloxane) and further ion-exchanged water, sodium erythorbate (Elbit N, 0.5 part made by Fuso Chemical Co., Ltd.) and ion-exchanged water (36.3 parts) An aqueous black ink was prepared by adding.

[Example 4]
A water-based black ink was prepared in the same manner as in Example 3 except that the amount of sodium erythorbate added in Example 3 was 1.0 part.

[Example 5]
A water-based black ink was prepared in the same manner as in Example 3 except that the addition amount of the 30% L-sodium ascorbate aqueous solution prepared in Example 1 was 1.67 parts.

[Example 6]
A water-based black ink was prepared in the same manner as in Example 3 except that the amount of the 30% L-sodium ascorbate aqueous solution prepared in Example 1 was changed to 3.33 parts.

[Comparative Example 1]
A water-based black ink was prepared in the same manner as in Example 3 except that erythorbic acid (manufactured by Junsei Chemical Co., Ltd., 1.0 part) was used instead of sodium erythorbate in Example 3.

[Comparative Example 2]
A water-based black ink was prepared in the same manner as in Example 3 except that L-ascorbic acid (manufactured by Junsei Chemical Co., Ltd., 1.0 part) was used instead of sodium erythorbate in Example 3.

[Comparative Example 3]
A water-based black ink was prepared in the same manner as in Example 3 except that sodium erythorbate was not contained in Example 3.

[Comparative Example 4]
(Step 2-1)
C. I. Disperse Yellow 54 30 parts, "Lignin sulfonate" as a dispersant (45 parts made by Nippon Paper Industries Co., Ltd., Vanillex RN) and ion-exchanged water 25 parts in a sand mill using 0.2 mm glass beads Then, the dispersion treatment was performed for about 15 hours under cooling, and after the dispersion treatment, 100 parts of ion-exchanged water was added to prepare a sublimable dye dispersion having a dye concentration of 15%. Next, the dispersion was filtered through glass fiber filter paper GC-50 (manufactured by Toyo Filter Paper Co., Ltd.) to remove coarse particles, thereby obtaining an aqueous dispersion 5.
(Process 2-2)
C. I. Disperse Orange 25, 30 parts of “Sodium Ligninsulfonate” (manufactured by Nippon Paper Industries Co., Ltd., Vanillex RN) as a dispersant, and 25 parts of ion-exchanged water were mixed into a sand mill using 0.2 mm glass beads. Then, the dispersion treatment was performed for about 15 hours under cooling, and after the dispersion treatment, 100 parts of ion-exchanged water was added to prepare a sublimable dye dispersion having a dye concentration of 15%. Subsequently, this dispersion liquid was filtered with glass fiber filter paper GC-50 (manufactured by Toyo Filter Paper Co., Ltd.) to remove coarse particles, whereby an aqueous dispersion liquid 6 was obtained.
(Step 2-3)
C. I. Disperse Blue 360 30 parts, a mixture of “sodium lignin sulfonate” (manufactured by Nippon Paper Industries Co., Ltd., Vanillex RN) as a dispersant, and 25 parts of ion-exchanged water was mixed in a sand mill using 0.2 mm glass beads. Then, the dispersion treatment was performed for about 15 hours under cooling, and after the dispersion treatment, 100 parts of ion-exchanged water was added to prepare a sublimable dye dispersion having a dye concentration of 15%. Subsequently, the dispersion was filtered through glass fiber filter paper GC-50 (manufactured by Toyo Filter Paper Co., Ltd.) to remove coarse particles, thereby obtaining an aqueous dispersion 7.
(Step 2-4)
C. I. Disperse Red 60 30 parts, a mixture of “sodium lignin sulfonate” (manufactured by Nippon Paper Industries Co., Ltd., Vanillex RN) as a dispersant, 25 parts of ion-exchanged water, and 0.2 mm diameter glass beads in a sand mill Then, the dispersion treatment was performed for about 15 hours under cooling, and after the dispersion treatment, 100 parts of ion-exchanged water was added to prepare a sublimable dye dispersion having a dye concentration of 15%. Next, the dispersion was filtered through glass fiber filter paper GC-50 (manufactured by Toyo Filter Paper Co., Ltd.) to remove coarse particles, whereby an aqueous dispersion 8 was obtained.

  Dispersion 5 (5 parts), Dispersion 6 (15 parts), Dispersion 7 (15 parts), 20 parts of glycerin, 8 parts of propylene glycol, BYK obtained in the above steps (2-1) to (2-3) -348 (manufactured by Big Chemie Japan Co., Ltd., polyether-modified polydimethylsiloxane), ion-exchanged water was further added, and sodium erythorbate (Elbit N, manufactured by Fuso Chemical Industries, Ltd., 0.5 part) and Aqueous black ink was prepared by adding ion exchange water (36.3 parts).

  The following evaluation tests were performed using the inks prepared as described above. The results are shown in Table 1 below.

[Measurement of dissolved oxygen content of ink]
The amount of dissolved oxygen was measured using a digital dissolved oxygen meter (POD-520) manufactured by FUSO Corporation. The measurement results are shown in Table 1 below. The “dissolved oxygen amount” in Table 1 below represents the amount of oxygen contained in the air dissolved in the ink, and its unit is mg / L.

[Evaluation of storage stability]
Each sample for test was prepared by weighing 100 g of the ink prepared in each Example and Comparative Example in a 100 ml polypropylene container (manufactured by As One Co., Ltd., Eyeboy Wide-mouth Bottle), and sealing with a cap lid. Each obtained sample was put in a 60 ° C. ± 1 ° C. incubator and stored for 1 week, and then allowed to stand until it returned to room temperature. The storage stability of the ink was evaluated according to the following evaluation criteria.
A: Generation | occurrence | production of a precipitate is not seen.
B: A precipitate is generated.

[Evaluation of initial fillability]
Each prepared ink was filled in an ink jet printer (trade name PX-504A, manufactured by EPSON Corporation). An initial filling operation was performed to the head. Thereafter, a nozzle check was performed to confirm whether ink could be ejected from all nozzles of the head. When there was a nozzle that could not eject ink, the head was cleaned (suction of ink in the nozzle), and then the nozzle check was performed again. Based on the number of cleanings required until ink can be ejected from all nozzles, the initial filling property was evaluated according to the following evaluation criteria. In this evaluation, the smaller the number of cleanings, the less the cleaning operation of the ink jet printer for ink ejection, and the lower the mechanical load. Therefore, a better ink composition is obtained.
A: Ejected from all nozzles only in the initial filling sequence.
B: The number of cleanings required until ink could be ejected from all nozzles was one.
C: The number of cleanings required to eject ink from all nozzles was 2 or more.

[Evaluation of continuous printing stability]
After confirming that ink could be ejected from all nozzles of the head by the above “Evaluation of Initial Fillability”, solid printing was performed as a 100% duty image on PPC paper (TP PAPER, NBS Ricoh). The discharge stability at the time of printing was evaluated for each of the extent to which there was no pin chipping and it was possible to discharge continuously, and was evaluated according to the following three criteria.
A: The number of sheets that can be discharged continuously is 80 sheets or more.
B: The number of sheets that can be discharged continuously is 40 sheets or more and less than 60 sheets.
C: The number of sheets that can be ejected continuously is 20 or less, and there are many pin defects.

[Evaluation of bleeding]
After confirming that ink could be ejected from all nozzles of the head by the above “Evaluation of Initial Fillability”, solid printing was performed as a 100% duty image on PPC paper (TP PAPER, NBS Ricoh). The bleeding of the image on the paper after printing was evaluated, and the evaluation was made according to the following three criteria.
A: There is no bleeding.
B: Bleeding appears in several places on the printed image.
C: It can be confirmed that the printed image is totally blurred.

[Odor evaluation]
After confirming that ink could be ejected from all nozzles of the head by the above “Evaluation of Initial Fillability”, solid printing was performed as a 100% duty image on PPC paper (TP PAPER, NBS Ricoh). Each of the odors on the printed paper was evaluated and evaluated according to the following three criteria.
A: There is no odor at all.
B: A faint odor can be confirmed.
C: The odor can be clearly confirmed.

As is clear from the results in Table 1 above, the ink compositions of Examples 3 to 6 are all evaluated in terms of storage stability evaluation, initial filling property evaluation, continuous printing stability evaluation, bleeding evaluation, and odor evaluation. Good results were shown. In particular, the ink compositions of Examples 3 and 4 to which sodium erythorbate was added were superior in storage stability, initial filling property and continuous printing stability as compared with the ink composition of Comparative Example 1 to which erythorbic acid was added. The results are shown. In addition, the ink compositions of Examples 5 and 6 to which 30% L-ascorbic acid aqueous solution was added were compared with the ink composition of Comparative Example 2 to which L-ascorbic acid was added. And excellent results in continuous printing stability. These results show that the storage stability of the ink composition is obtained by adding an organic acid having a lactone structure in which one or more hydroxyl groups are alkali-chlorinated to the organic acid having a lactone structure having a hydroxyl group as a substituent. This shows that the initial filling property and the continuous printing stability are improved.
Further, the ink composition of Example 3 to which the emulsion solution of Joncryl 678 was added as a dispersant was compared with the ink composition of Comparative Example 4 to which sodium lignin sulfonate was added as a dispersant. The results of the evaluation and the odor evaluation were excellent.
These results show that the ink compositions of Examples 3 to 6 have the above performances (storage stability / initial filling property, continuous printing stability / low bleeding property / low odor property), various recording inks, In particular, it is shown to be extremely useful as an ink for inkjet textile printing.

  The ink composition of the present invention has high storage stability and can maintain the printing suitability required for various textile printing inks, particularly ink jet textile printing inks. Therefore, the ink composition is extremely useful as an ink jet textile ink for sublimation transfer. .

Claims (16)

(A) An organic acid having a lactone structure having a hydroxyl group as a substituent, an organic acid having a lactone structure in which one or more hydroxyl groups are alkali-chlorinated, (B) a colorant, (C) styrene- (meth) acrylic copolymer An ink composition for ink jet printing containing a coalescence. The ink composition for ink jet printing according to claim 1, wherein (A) the organic acid having a lactone structure having a hydroxyl group as a substituent is an organic acid having a lactone structure in which one hydroxyl group is alkali-chlorinated. 3. The ink composition for ink jet printing according to claim 2, wherein (A) the organic acid has a lactone structure having a hydroxyl group as a substituent, and the organic acid has a lactone structure in which one hydroxyl group is sodium chloride. (A) Ink-jet printing according to claim 3, wherein in the organic acid having a lactone structure having a hydroxyl group as a substituent, the organic acid having a lactone structure in which one hydroxyl group is sodium chloride is sodium L-ascorbate or sodium erythorbate Ink composition. (B) The colorant is a sublimable dye, The ink composition for inkjet textile printing as described in any one of Claims 1 thru | or 4. (B) The colorant is C.I. I. Disperse Yellow, C.I. I. Disperse orange, C.I. I. Disperse Blue and C.I. I. 6. The ink composition for ink jet textile printing according to claim 5, wherein the ink composition is a dye selected from the group consisting of disperse threads. (B) The colorant is C.I. I. Disperse Yellow 54, C.I. I. Disperse Orange 25, C.I. I. Disperse Blue 360, C.I. I. The ink composition for ink jet textile printing according to claim 6, wherein the ink composition is a dye selected from the group consisting of disperse threads 60. The ink composition for ink-jet textile printing according to any one of claims 1 to 7, wherein the weight average molecular weight of the (C) styrene- (meth) acrylic copolymer is 1,000 to 20,000. The ink composition for ink jet textile printing according to any one of claims 1 to 8, wherein the weight average molecular weight of the (C) styrene- (meth) acrylic copolymer is 2,000 to 19,000. The ink composition for inkjet textile printing according to any one of claims 1 to 9, wherein the weight average molecular weight of the (C) styrene- (meth) acrylic copolymer is 4,000 to 17,000. Furthermore, the ink composition for inkjet textile printing as described in any one of the Claims 1 thru | or 10 containing a water-soluble organic solvent. Furthermore, the ink composition for inkjet textile printing as described in any one of Claims 1 thru | or 11 containing water. A step A in which a droplet of the ink composition for ink jet textile printing according to any one of claims 1 to 12 is attached to a hydrophobic fiber by an ink jet printer, and a droplet in the ink composition attached in the step A A method for printing hydrophobic fibers, comprising: a step B for fixing the colorant to the fiber by heat; and a step C for washing the unfixed colorant remaining in the fiber. An ink composition in the intermediate recording medium after the droplets of the ink composition for inkjet textile printing according to any one of claims 1 to 12 are attached to the intermediate recording medium by an ink jet printer to obtain a recorded image. A method for printing a hydrophobic fiber, wherein the recorded image is transferred to the hydrophobic fiber by bringing the hydrophobic fiber into contact with the surface to which the droplets are attached and heat-treating it. The fiber pretreatment process of adding the aqueous solution containing 1 or more types of paste materials, an alkaline substance, an anti-reduction agent, and a hydrotropic agent to the fiber before making an ink composition adhere, 15. Printing method for hydrophobic fibers. A dyed hydrophobic fiber obtained by the method for printing a hydrophobic fiber according to any one of claims 13 to 15.