Water-based ink jet printing ink composition for textile printing

Abstract

To provide an ink composition for textile water-based inkjet printing that is excellent in nozzle plate liquid repellency, nozzle plate fouling prevention, and ejection performance, and furthermore achieves both of sufficient image density and washing fastness.SOLUTION: Provided is an ink composition for textile water-based inkjet printing that comprises a pigment, a water-dispersible resin, a surfactant, a cross-linking agent and water, contains a nonionic surfactant having a HLB of 1.0 to 5.0 by 0.1 to 3.0 mass% as the surfactant for the total amount of ink composition, and, furthermore, contains blocked isocyanate by 0.1 to 5.0 mass% as the cross-linking agent.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an aqueous ink composition for ink jet printing for textile printing. [Background technology]

[0002] Known aqueous ink jet printing ink compositions for textile printing include those containing a surfactant with a high HLB value, a urethane resin with a relatively low elongation at break, and a crosslinking agent in combination, as described in Patent Document 1. Also known is an aqueous ink jet printing ink composition for textile printing that uses a blocked isocyanate as a crosslinking agent and has a high HLB value, as described in Patent Document 2. However, such aqueous ink compositions for inkjet printing for textile printing are inferior in nozzle plate liquid repellency, nozzle plate staining, and ejection properties, and further fail to achieve both sufficient image density and washing fastness. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-215506 [Patent Document 2] Japanese Patent Application Publication No. 2018-131581 Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide an aqueous ink composition for inkjet printing for textile printing that exhibits excellent nozzle plate liquid repellency, prevention of nozzle plate contamination, and dischargeability, while also achieving sufficient image density and washing fastness. [Means for solving the problem]

[0005] As a result of extensive research into solving the above problems, the inventors have obtained the following aqueous ink composition for inkjet printing for textile printing. 1. Contains pigment, water-dispersible resin, surfactant, crosslinker and water, With respect to the total amount of the ink composition, The surfactant contains 0.1 to 3.0 mass% of a nonionic surfactant having an HLB of 1.0 to 5.0, Furthermore, the crosslinking agent contains 0.1 to 5.0 mass % of a blocked isocyanate. Aqueous ink composition for ink jet printing for textile printing. 2. The aqueous ink composition for ink-jet printing for textile printing according to 1, wherein the surfactant comprises a nonionic surfactant having an HLB of 1.0 to 3.0. 3. The aqueous ink composition for inkjet printing for textile printing according to 1 or 2, wherein the water-dispersible resin comprises at least one selected from the group consisting of urethane resins and styrene-acrylic resins. [Effects of the Invention]

[0006] The aqueous ink composition for inkjet printing for textile printing of the present invention can exhibit the remarkable effects of being excellent in nozzle plate liquid repellency, prevention of nozzle plate contamination, and dischargeability, while also achieving sufficient image density and washing fastness. DETAILED DESCRIPTION OF THE INVENTION

[0007] The aqueous ink composition for ink-jet printing for textile printing of the present invention (hereinafter also referred to as the ink composition of the present invention) will be described in detail below, focusing on its components.

[0008] <Pigments> The aqueous ink jet printing ink composition for textile printing of the present invention contains one or more pigments of each hue to form ink jet printing ink compositions of each color. As such a pigment, any pigment such as an organic pigment or an inorganic pigment that has been conventionally used in ordinary ink compositions for ink jet printing can be used without any particular limitation. Furthermore, a resin-coated pigment obtained by coating an organic or inorganic pigment with a resin layer can also be used. In the present invention, colored resin particles containing a polymer having an acid value of 5 to 100 mgKOH / g or a dye may or may not be used. Examples of organic pigments include dye lake pigments, azo-based, benzimidazolone-based, phthalocyanine-based, quinacridone-based, anthraquinone-based, dioxazine-based, indigo-based, thioindigo-based, perylene-based, perinone-based, diketopyrrolopyrrole-based, isoindolinone-based, nitro-based, nitroso-based, anthraquinone-based, flavanthrone-based, quinophthalone-based, pyranthrone-based, and indanthrone-based pigments. Examples of inorganic pigments include carbon black, titanium oxide, red iron oxide, graphite, iron black, chromium oxide green, and aluminum hydroxide. Specific examples of pigments for each representative hue of the aqueous ink composition for ink jet printing for textile printing of the present invention are as follows: First, examples of yellow pigments for use in inkjet textile printing ink compositions include CI Pigment Yellow 1, 2, 3, 12, 13, 14, 16, 17, 42, 73, 74, 75, 81, 83, 87, 93, 95, 97, 98, 108, 109, 114, 120, 128, 129, 138, 139, 150, 151, 155, 166, 180, 184, 185, and 213, and preferred examples include CI Pigment Yellow 13, 14, 17, 74, 155, and 213. Examples of magenta pigments for use in aqueous inkjet printing ink compositions for textile printing include CI Pigment Red 5, 7, 12, 22, 38, 48:1, 48:2, 48:4, 49:1, 53:1, 57, 57:1, 63:1, 101, 102, 112, 122, 123, 144, 146, 149, 168, 177, 178, 179, 180, 184, 185, 190, 202, 209, 224, 242, 254, 255, 270, and CI Pigment Violet 19, and preferably CI Pigment Red 122, 202, and Pigment Violet 19. Examples of cyan pigments for use in aqueous inkjet printing ink compositions for textile printing include CI Pigment Blue 1, 2, 3, 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 18, 22, 27, 29, and 60, and preferably CI Pigment Blue 15:3. Examples of black pigments for use in aqueous ink jet printing ink compositions for textile printing include carbon black (CI Pigment Black 7). Examples of white pigments for use in the aqueous inkjet printing ink composition for textile printing include titanium oxide and aluminum oxide, and preferably titanium oxide that has been surface-treated with various materials such as alumina and silica. The pigment content in the aqueous ink jet printing ink composition for textile printing of the present invention is preferably 1.0 to 20.0% by mass based on the total amount of the aqueous ink jet printing ink composition for textile printing. If the pigment content is less than 1.0% by mass, the image quality of the resulting print tends to be reduced. On the other hand, if the pigment content exceeds 20.0% by mass, the viscosity characteristics of the aqueous ink jet printing ink composition for textile printing tend to be adversely affected.

[0009] <Pigment dispersant> The aqueous ink composition for ink jet printing for textile printing of the present invention may further contain a pigment dispersant, if necessary. The pigment dispersant is used to further improve the pigment dispersibility and storage stability of the ink composition of the present invention, and any conventionally used dispersant can be used without particular limitation, but it is preferable to use a polymer dispersant. Examples of such pigment dispersants include carbodiimide-based dispersants, polyester amine-based dispersants, fatty acid amine-based dispersants, modified polyacrylate-based dispersants, modified polyurethane-based dispersants, multi-chain polymeric nonionic dispersants, and polymeric ionic surfactants. These pigment dispersants can be used alone or in combination of two or more. In particular, it is preferable to use an acrylic acid / lauryl acrylate / styrene copolymer. The pigment dispersant is preferably contained in an amount of 1 to 200 parts by mass, assuming that the total amount of pigment used is 100 parts by mass. If the content of the pigment dispersant is less than 1 part by mass, the pigment dispersibility and storage stability of the ink composition of the present invention may decrease. On the other hand, although it may be contained in an amount exceeding 200 parts by mass, there may be no difference in effect. In particular, the lower limit of the content of the pigment dispersant is more preferably 5 parts by mass or more, and more preferably 60 parts by mass or less.

[0010] <Water dispersible resin> As the water-dispersible resin in the present invention, urethane resin and styrene-acrylic resin are preferred. Among urethane resins, polyether polyurethane resin, polyester polyurethane resin, and polycarbonate polyurethane resin are more preferred, and polyether polyester polyurethane is even more preferred.

[0011] Among water-dispersible resins having such physical properties, urethane resins that can be used include NeoRez R-966, NeoRez R-967 (DSM), Takelac W-6110, Takelac WS-5000 (Mitsui Chemicals), Bayhydrol UH 650, Impranil DLP-R, Baybond PU407 (Sumika Covestro Urethanes), Superflex 300, Superflex 740 (Dai-ichi Kogyo Seiyaku), DAOTANTW6491, DAOTANTW6495 (Daicel-Allnex), and the like. Styrene-acrylic resin is a copolymer of styrene, (meth)acrylic acid, and (meth)acrylic acid alkyl ester. Known monomers that can be used as comonomers in acrylic resins, such as acrylamide and acrylonitrile, can be used as long as they do not impair the effects of the styrene-acrylic resin emulsion. As such a styrene acrylic resin, for example, Yodosol AD199 (Henkel) or Movinyl 966A (Japan Coating Resins) can be used.

[0012] The water-dispersible resin is preferably contained in an amount of 0.01 to 2.0 parts by mass per 1 part by mass of the pigment. If the amount is less than 0.01 parts by mass, the wash fastness and dry rub fastness may decrease, and if it exceeds 2.0 parts by mass, the feel after curing may be poor. In the present invention, it is preferable to use only one type of water-dispersible resin. Even when two or more types are used, it is necessary that all of the resins satisfy the physical properties of the present invention. In addition, other resins may be used together with the water-dispersible resin of the present invention within the scope of the effects of the present invention. may be used in combination.

[0013] <Surfactant> The aqueous inkjet printing ink composition for textile printing of the present invention contains a nonionic surfactant having an HLB of 1.0 to 5.0. Among these, those having an HLB of 1.3 or more are preferred, and those having an HLB of 1.5 or more are more preferred. Those having an HLB of 4.5 or less are also preferred, those having an HLB of 4.0 or less are more preferred, and those having an HLB of 3.5 or less are even more preferred. As the surfactant in the present invention, for example, polyoxyethylene polyoxypropylene block polymer, acetylene glycol, ethylene oxide adduct of acetylene glycol, etc. can be used, and a nonionic fluorine-based surfactant may or may not be used. If a surfactant with an HLB of more than 5.0 is used, the nozzle plate liquid repellency, nozzle plate contamination, and ejection performance will be poor, and if a surfactant that is not nonionic is used, the image density will also be poor. In addition, surfactants other than nonionic surfactants, such as anionic, cationic, and amphoteric surfactants, may be contained, but even in this case, they should be contained to an extent that does not impair the effects of the present invention. A nonionic surfactant with an HLB of more than 5.0 may be used in combination, but even in this case, the amount of the nonionic surfactant is preferably 0.5 parts by mass or less per part by mass of the nonionic surfactant with an HLB of 1.0 to 5.0, provided that the effects of the present invention are not impaired. The content of the nonionic surfactant having an HLB of 1.0 to 5.0 in the ink composition of the present invention is 0.1 to 3.0% by mass, preferably 0.3% by mass or more, more preferably 0.7% by mass or more, based on the total amount of the aqueous ink composition for inkjet printing for textile printing, and is preferably 2.7% by mass or less, more preferably 2.0% by mass or less. If the content is less than 0.1% by mass, the surface tension of the aqueous ink composition for inkjet printing for textile printing of the present invention increases, resulting in a decrease in ejection stability from an inkjet head, whereas if the content exceeds 3.0% by mass, bubbles increase in the aqueous ink composition for inkjet printing for textile printing, resulting in a decrease in ejection stability.

[0014] <Crosslinking agent> The crosslinking agent used in the present invention is a blocked isocyanate compound, and one or more compounds selected from the group consisting of carbodiimide compounds, oxazoline group-containing polymers, epoxy compounds, adducts of urea, melamine, benzoguanamine, or the like with formaldehyde, and polyfunctional aziridine compounds can also be used within the range that does not impair the effects of the present invention. Furthermore, crosslinkers that are dispersed, emulsified, dissolved in water or that can be dispersed, emulsified and / or dissolved in water are particularly preferred. In the present invention, the crosslinking agent is contained in an amount of 0.1 to 5.0% by mass relative to the total amount of the aqueous inkjet printing ink composition for textile printing. Of these, 0.5% by mass or more is preferred, 1.0% by mass or more is more preferred, and 1.5% by mass or more is even more preferred. Furthermore, 4.5% by mass or less is preferred, 4.0% by mass or less is more preferred, 3.5% by mass or less is even more preferred, and 3.0% by mass or less is most preferred. If the concentration of the crosslinking agent is less than 0.1% by mass, the printed item will have poor washing fastness, and if it exceeds 5.0% by mass, the dischargeability will be poor. The content is preferably 0.02 to 0.6 parts by mass, more preferably 0.1 to 0.4 parts by mass, and even more preferably 0.15 to 0.3 parts by mass, per part by mass of the water-dispersible resin. If the amount is less than 0.03 parts by mass, the wash fastness and dry rub fastness may decrease, and if it exceeds 0.5 parts by mass, the feel after curing may be poor.

[0015] The blocked isocyanate compound used as a crosslinking agent in the present invention is a polyisocyanate compound in which the active isocyanate groups have been inactivated by reacting them in advance with a blocking agent such as phenol. In this state, the blocked isocyanate crosslinking agent cannot undergo a crosslinking reaction and is chemically stable, but when the blocking groups bonded to the isocyanate groups are dissociated by heat treatment or the like to form active isocyanate groups, the blocked isocyanate crosslinking agent becomes capable of undergoing a crosslinking reaction.

[0016] The compound constituting the polyisocyanate portion of the blocked isocyanate compound is preferably a diisocyanate compound, a triisocyanate compound, or a polyisocyanate compound, such as hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, hexamethylene triisocyanate, lysine ester triisocyanate, isophorone diisocyanate, hydrogenated xylylene diisocyanate, toluene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, etc. Of these, triisocyanate compounds, for example, modified products of hexamethylene diisocyanate such as a tris-biuret modified product of hexamethylene diisocyanate, are more preferred.

[0017] Examples of compounds constituting such a polyisocyanate moiety include polyisocyanate compounds having two or more isocyanate groups per molecule, such as various polyisocyanate compounds such as diisocyanate compounds, triisocyanate compounds, tetraisocyanate compounds, pentaisocyanate compounds, and hexaisocyanate compounds. Specific examples of polyisocyanate compounds include aromatic polyisocyanates such as tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, biphenyl diisocyanate, 3,3'-dimethyl-4,4'-biphenylene diisocyanate, methylenebis(phenylisocyanate), and isophorone diisocyanate; alicyclic polyisocyanates such as hydrogenated tolylene diisocyanate, hydrogenated xylylene diisocyanate, and hydrogenated diphenylmethane diisocyanate; and aliphatic polyisocyanates such as 1,4-tetramethylene diisocyanate, hexamethylene diisocyanate, and 2,2,4-trimethylhexamethylene diisocyanate. The polyisocyanate compound constituting the blocked isocyanate crosslinking agent according to this embodiment may be one type or multiple types. From the viewpoint of preventing the adhesive from flowing out, it is preferable that the polyisocyanate compound constituting the blocked isocyanate crosslinking agent according to this embodiment contains a triisocyanate compound.

[0018] The blocking agent for the blocked isocyanate crosslinking agent is not particularly limited. In addition to the above-mentioned phenols, cresol, ethylphenol, butylphenol, 2-hydroxypyridine, dimethyl malonate, diethyl malonate, methyl acetoacetate, ethyl acetoacetate, acetylacetone, butyl mercaptan, dodecyl mercaptan, acetanilide, acetic acid amide, ε-caprolactam, δ-valerolactam, γ-butyrolactam, succinimide, maleimide, imidazole, 2-methylimidazole, urea, thiourea, ethyleneurea, formaldoxime, acetaldoxime, acetoneoxime, methyl ethyl ketoxime, methyl isobutyl ketoxime, cyclohexanone oxime, carbazole, dimethylpyrazole, triazole, and the like may be used. The blocking agent constituting the blocked isocyanate crosslinking agent according to this embodiment may be one type or multiple types. Furthermore, the combination of the blocking agent and the polyisocyanate compound is not particularly limited, and there may be a plurality of such combinations, so that the blocked isocyanate crosslinking agent according to the present embodiment is composed of a plurality of types of compounds.

[0019] The blocked isocyanate compound is preferably thermally decomposable. In the case of a thermally decomposable blocked isocyanate compound, the temperature at which the deblocking reaction of the blocking agent, i.e., the deblocking reaction, becomes significant (hereinafter referred to as the "deblocking temperature") can be adjusted depending on the type of blocking agent and the type of blocked polyisocyanate compound. The specific deblocking temperature is not particularly limited. However, when the temperature is, for example, 70 to 130°C, an aqueous inkjet printing ink composition for textile printing containing a blocked isocyanate crosslinking agent having that deblocking temperature has a low or substantially zero crosslinking point density before crosslinking. However, the crosslinking density can be increased by allowing the crosslinking reaction to proceed and forming a crosslinked structure.

[0020] <Solvent> The present invention may contain water and a water-soluble organic solvent for the purpose of improving the printability of the aqueous ink composition for inkjet printing for textile printing, etc. The water-soluble organic solvent is selected from polyols such as glycerin, propylene glycol, and 1,3-butanediol, glycol ethers such as dipropylene glycol dimethyl ether and diethylene glycol ethyl methyl ether, glycol ether esters, alcohols, ketones, organic carbonates, and mixtures thereof. The content of such water-soluble organic solvents in the aqueous ink composition for inkjet printing for textile printing is preferably 10% by mass or more, more preferably 15% by mass or more, and even more preferably 20% by mass or more. It is also preferably 35% by mass or less, more preferably 30% by mass or less, and even more preferably 27% by mass or less. If the content exceeds 35% by mass, problems may occur in terms of viscosity, ejection properties, and ink film properties.

[0021] <Additives> Various additives can be added to the aqueous ink jet printing ink composition for textile printing of the present invention to exhibit various functionalities as needed. Specific examples include light stabilizers, surface treatment agents, antioxidants, antiaging agents, crosslinking accelerators, plasticizers, preservatives, pH adjusters, antifoaming agents, and humectants. A non-curable resin that functions as a vehicle may or may not be added. It is not necessary to contain acrylic resin particles containing acrylic blocked isocyanate groups.

[0022] The method for preparing the ink composition of the present invention is not particularly limited, and any conventional method for obtaining a printing ink composition or an aqueous ink composition for ink jet printing for textile printing can be employed. Specifically, a method can be employed in which an anionic group-containing resin is dissolved in an alkaline aqueous solution, and then a pigment is added to the solution and kneaded.

[0023]

[0043] Specific examples of the method for printing and curing the aqueous ink composition for inkjet printing for textile printing of the present invention include a method in which the ink composition of the present invention is ejected onto a substrate using an inkjet head, and then the coating film of the ink composition of the present invention that has landed on the substrate is heated and cured. For example, ejection onto a substrate (printing of an image) can be performed by supplying the ink composition of the present invention to a printer head of an inkjet recording printer that is compatible with low viscosity inks, and ejecting the ink composition from the printer head onto the substrate so that the coating film has a thickness of, for example, 1 to 60 μm. As a printer for ink jet recording system for printing the aqueous ink composition for ink jet printing for textile printing of the present invention, any conventionally used printer for ink jet recording system can be used. The device used for heat curing can be any known device for curing heat-curable ink compositions. Examples of heat sources include devices that heat the substrate by directly contacting it with infrared rays, electric heating wires, irons, etc. When the aqueous ink composition for ink-jet printing for textile printing of the present invention is ejected onto a substrate, a pretreatment liquid may or may not be applied to the substrate.

[0024] <Fabric> The substrate to be printed with the aqueous ink jet printing ink composition for textile printing of the present invention may be a conventionally used fabric, and examples thereof include fabrics made of cotton, silk, linen, rayon, acetate, nylon or polyester fibers, and blended fabrics made of two or more of these fibers. [Example]

[0025] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, "%" means "% by mass" and "parts" means "parts by mass." The materials used in the following examples and comparative examples are as follows: In the tables, the units of values ​​in the columns relating to pigment, dispersant, resin, solvent and total are "% by mass". Evaluation method <Nozzle plate liquid repellency> The aqueous ink compositions for inkjet printing for textile printing of the Examples and Comparative Examples were dropped onto a silicone nozzle plate, and after 5 minutes the nozzle plate was tilted vertically to visually evaluate how the ink droplets remained according to the following evaluation criteria. ◎: Nothing remains on the nozzle plate ○: Some ink remains on the nozzle plate △: The entire ink remains on the nozzle plate, but it can be washed off with water. ×: The entire ink remains on the nozzle plate, and it is impossible to wash it off with water.

[0026] <Nozzle plate contamination> Using an evaluation printer equipped with a Kyocera KJ4B-YH head, continuous printing was carried out using the aqueous ink compositions for inkjet printing for textile printing of the Examples and Comparative Examples, and then the results were visually evaluated according to the following evaluation criteria. ◎: No dirt is found on the nozzle plate after continuous printing for more than one hour. Good: No dirt is found on the nozzle plate during continuous printing for 15 minutes or more but less than 1 hour. △: After 15 minutes or more and less than 1 hour of continuous actual printing, dirt was observed on the nozzle plate, but the dirt could be washed off with water. ×: After continuous actual printing for 15 minutes or more and less than 1 hour, dirt was observed on the nozzle plate, and it was impossible to wash the dirt off with water.

[0027] <Dischargeability> Using an evaluation printer equipped with a Kyocera KJ4B-YH head, continuous printing was carried out using the aqueous ink jet printing ink compositions for textile printing of the Examples and Comparative Examples, and then the results were evaluated according to the following evaluation criteria. ◎: No ejection problems were observed in any of the nozzles during continuous printing for more than one hour. ○: No ejection problems were observed in any nozzles during actual printing operations lasting 15 minutes or more but less than 1 hour. △: During continuous actual printing operation for 15 minutes or more but less than 1 hour, there are nozzles that become unable to eject ink. ×: All nozzles become unable to eject ink during continuous actual printing for 15 minutes or more but less than 1 hour.

[0028] <Method for creating printed materials for evaluation (using white ink composition)> A 100% cotton black fabric was impregnated with 10 g of the inkjet textile printing treatment liquid per A4 size, and then heated and dried. Using an evaluation printer equipped with a Kyocera KJ4B-YH printhead, the aqueous inkjet printing ink compositions for textile printing of Examples and Comparative Examples were printed in a manner that resulted in 16 overlapping solid prints, and then the fabric was heated at 170°C for 1 minute using a heat press machine, to obtain printed materials for evaluation of Examples and Comparative Examples.

[0029] <Method for creating printed materials for evaluation (using ink compositions other than white ink)> Using an evaluation printer equipped with a Kyocera KJ4B-YH printhead, the aqueous ink jet printing ink compositions for textile printing of the Examples and Comparative Examples were printed onto 100% cotton white fabric in a manner that overlapped solid prints four times, and then the resulting prints were heated at 170°C for 1 minute using a heat press machine to obtain evaluation prints of the Examples.

[0030] <Image density (white ink)> The lightness (L*) of the printed matter of the Examples and Comparative Examples was measured using a color difference meter (product name "DR-321", manufactured by Konica Minolta, Inc.) and evaluated according to the following evaluation criteria. ◎: L* is 90 or more ○: L* is 80 or more and less than 90 △: L* is 60 or more and less than 80 ×: L* is less than 60

[0031] <Image density (ink other than white ink)> The optical density (OD) of the printed matter of the Examples and Comparative Examples was measured using a color difference meter (product name "DR-321", manufactured by Konica Minolta Inc.) and evaluated according to the following evaluation criteria. ◎:OD is 1.0 or more ○: OD is 0.8 or more and less than 1.0 △: OD is 0.6 or more and less than 0.8 ×: OD less than 0.6

[0032] <Washing fastness> The printed materials of the Examples and Comparative Examples were washed five times in a household washing machine using the normal washing cycle (washing conditions: wash in normal mode → spin-dry → dry). The brightness of each printed material before and after washing was measured using a colorimeter (product name "DR-321", manufactured by Konica Minolta). The rate of change from the initial value of brightness (L*) or optical density (OD) before washing was measured and evaluated according to the following evaluation criteria. ◎: Image density maintains 90% or more of the initial value after washing ○: Image density after washing is 80% or more but less than 90% of the initial value △: Image density after washing is 70% or more but less than 80% of the initial value ×: Image density after washing is less than 70% of the initial value

[0033] - Ink preparation method, etc. Titanium dioxide (product name "Tipake CR-90", alumina silica treatment, average primary particle size 0.25 μm, oil absorption 21 ml / 100 g, Ishihara Sangyo Co., Ltd.) Blue pigment (CI Pigment Blue 15:3, product name "LIONOL BLUE FG-7330", Toyocolor Co., Ltd.) Yellow pigment (CI Pigment Yellow 74, product name "Brilliant Yellow 5GX", Clariant) Red pigment (CI Pigment Red 122, product name "CROMOPHTAL PINK PT", BASF) Black pigment (CI Pigment Black 7, product name "MA100", Mitsubishi Chemical Corporation)

[0034] <Water-based acrylic resin varnish> 25 parts of an acrylic acid / lauryl acrylate / styrene copolymer with a mass average molecular weight of 30,000 and an acid value of 140 mgKOH / g was dissolved in a mixed solution of 3.5 parts of potassium hydroxide and 71.5 parts of water to obtain an aqueous acrylic resin varnish with a solids content of 25%.

[0035] ·Dispersion liquid preparation <Preparation of Water-Based White Ink Base> 19 parts of water was added to 36 parts of the above water-based acrylic resin varnish and mixed, and then 45 parts of titanium oxide was added and mixed with stirring, followed by milling in a wet circulation mill to obtain a water-based white ink base. Preparation of the aqueous blue ink base 64 parts of water was added to 16 parts of the above water-based acrylic resin varnish and mixed, and then 20 parts of blue pigment was added and mixed with stirring, followed by milling in a wet circulation mill to obtain a water-based blue ink base. <Preparation of Water-Based Yellow Ink Base> 64 parts of water was added to 16 parts of the above water-based acrylic resin varnish and mixed, and then 20 parts of yellow pigment was added and mixed with stirring, followed by milling in a wet circulation mill to obtain a water-based yellow ink base. <Preparation of aqueous red ink base> 64 parts of water was added to 16 parts of the above water-based acrylic resin varnish and mixed, and then 20 parts of red pigment was added and mixed with stirring, followed by milling in a wet circulation mill to obtain a water-based red ink base. <Preparation of Water-Based Black Ink Base> 64 parts of water was added to 16 parts of the above water-based acrylic resin varnish and mixed, and then 20 parts of black pigment was added and mixed with stirring, followed by milling in a wet circulation mill to obtain a water-based black ink base.

[0036] <Preparation of treatment liquid for inkjet printing> To 83.7 parts of water, 10 parts of calcium nitrate tetrahydrate, 6.0 parts of a nonionic styrene-acrylic self-crosslinking resin emulsion having a glass transition temperature of −30° C. (trade name: Movinyl 966A, manufactured by Japan Coating Resins Co., Ltd., solids content 45% by mass), and 0.3 parts of Acetylenol E100 (HLB 13.5, ethylene oxide adduct of acetylene glycol, manufactured by Kawaken Fine Chemicals Co., Ltd.) were added and stirred to obtain a treatment liquid for inkjet textile printing.

[0037] (Water dispersible resin) NeoRez R-966 (DSM) (polyether polyurethane resin (active ingredient content 33% by weight)) Bayhydrol UH 650 (Sumika Kobestro Urethane Co., Ltd.) (polyester polyurethane resin (active ingredient content 50% by weight)) Takelac W-6110 (Mitsui Chemicals) (polycarbonate polyurethane resin (active ingredient content 32% by weight)) Movinyl 966A (Japan Coating Resin Co., Ltd.) (styrene-acrylic resin (active ingredient content 45% by weight))

[0038] (Crosslinking agent) Bayhydur BL2867 (Sumika Kobestro Urethane Co., Ltd.) (blocked isocyanate (active ingredient content 38% by weight) Epocross WS-700 (Nippon Shokubai Co., Ltd.) (acrylic containing oxazoline groups (active ingredient content 25% by weight)) Carbodilite V-02 (Nisshinbo Chemical Co., Ltd.) (carbodiimide (active ingredient 40% by weight))

[0039] (surfactant) Newpol PE-71 (Sanyo Chemical Co., Ltd.) (polyoxyethylene polyoxypropylene block polymer (active ingredient 100% by weight)) nonionic surfactant, HLB value 1.9 Newpol PE-62 (Sanyo Chemical Co., Ltd.) (polyoxyethylene polyoxypropylene block polymer (active ingredient 100% by weight)) nonionic surfactant, HLB value 4.2 Surfynol 104PG-50 (Nissin Chemical Industry Co., Ltd.) (acetylene glycol (active ingredient 50% by weight)) nonionic surfactant, HLB value 4.0 Newpol PE-74 (Sanyo Chemical Co., Ltd.) (polyoxyethylene polyoxypropylene block polymer (active ingredient 100% by weight)) nonionic surfactant, HLB value 8.1 Surfynol 440 (Nissin Chemical Industry Co., Ltd.) (acetylene glycol ethylene oxide adduct (active ingredient 100% by weight)) nonionic surfactant, HLB value 8.0 LATEMURU E-150 (Kao Corporation) (Polyoxyethylene lauryl ether sodium sulfate (active ingredient 33% by weight)) Anionic surfactant Amphitol 20AB (Kao Corporation) (uric acid amidopropyl betaine (active ingredient 30% by weight)) amphoteric surfactant Olfin E1010 (Nissin Chemical Industry Co., Ltd.) (acetylene glycol ethylene oxide adduct, active ingredient 100% by weight) Nonionic surfactant, HLB value 13.0-14.0

[0040] [Table 1] JPEG0007783694000002.jpg119170 JPEG0007783694000003.jpg105170

[0041] As shown in each example, the aqueous ink composition for inkjet printing for textile printing of the present invention was excellent in nozzle plate liquid repellency, nozzle plate staining, ejection properties, and washing fastness of the printed area, and also provided high image density of the printed textile. In contrast, Comparative Example 1, which did not use a crosslinking agent, exhibited poor washing fastness, and Comparative Example 2, which used an excessive amount of crosslinking agent, exhibited poor dischargeability. Comparative Examples 3 and 4, which used a crosslinking agent other than blocked isocyanate, also exhibited poor washing fastness. Furthermore, in Comparative Example 5, in which no surfactant with an HLB of 1.0 to 5.0 was used, the nozzle plate liquid repellency, nozzle plate contamination, and ejection performance were poor. In Comparative Example 6, in which an excessive amount of surfactant was used, the washing fastness was poor. In Comparative Examples 7 and 8, in which only a surfactant with an HLB value exceeding 5.0 was used, the liquid repellency of the nozzle plate was poor and contamination of the nozzle plate occurred. Furthermore, in Comparative Examples 9 and 10, in which a surfactant that was not a nonionic surfactant was used in combination with a surfactant with an HLB value exceeding 5.0, the liquid repellency of the nozzle plate was poor, contamination of the nozzle plate occurred, and the image density was insufficient.

Claims

1. The composition includes a pigment, a water-dispersible resin, a surfactant, a crosslinker, and water, With respect to the total amount of the ink composition, The surfactant contains 0.1 to 3.0 mass % of a nonionic surfactant having an HLB of 1.0 to 5.0, wherein the nonionic surfactant having an HLB of 1.0 to 5.0 contains a polyoxyethylene polyoxypropylene block polymer; Further, the crosslinking agent contains 0.1 to 5.0 mass% of a blocked isocyanate. Aqueous ink composition for ink jet printing for textile printing.

2. 2. The aqueous ink composition for ink-jet printing for textile printing according to claim 1, wherein the nonionic surfactant having an HLB of 1.0 to 5.0 includes a nonionic surfactant having an HLB of 1.0 to 3.

0.

3. 3. The aqueous ink composition for inkjet printing for textile printing according to claim 1, wherein the water-dispersible resin comprises at least one resin selected from the group consisting of urethane resins and styrene-acrylic resins.

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