JP2009215506A - Ink for textile printing inkjet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide ink for textile printing inkjet good in washing and friction solidity, and a method of manufacturing a textile printed material made by the ink. <P>SOLUTION: The ink for textile printing inkjet contains a pigment, a water-dispersible resin, a crosslinking agent and water, wherein the water dispersible resin contains a resin with a film elongation of 650-1,200% and a tensile strength of 15-55 N/mm<SP>2</SP>in an amount of 1 to 3 pts.wt. based on 1 pt.wt. of the pigment and a blocked isocyanate type compound is contained as the crosslinking agent in an amount of 0.15 to 2.5 pts.wt. based on 1 pt.wt. of the water-dispersible resin. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a textile inkjet ink used for textile printing by the inkjet recording method, and a method for producing a printed matter using the same.

  As a method for printing images such as letters, pictures, designs, etc. on fabrics such as textiles and non-woven fabrics, in addition to screen printing methods and roller printing methods, in recent years, textiles that can be processed virtually without printing by image processing on a computer. Inkjet methods are attracting attention.

  As coloring materials for textile printing inks, there are dyes and pigments. In the case of using a dye, in addition to good color development, there is an advantage that the dyeing fastness is high because the dye is dyed by utilizing the reaction with the functional group of the fiber. However, there is a problem that it is necessary to select a dye according to the type of fiber because the light resistance of the dye itself is low. In addition, pretreatment for suppressing bleeding and post-treatment such as a steaming process for fixing the dye and a washing process for washing the unfixed dye are necessary, and these work burdens arise and water pollution occurs. And the problem of causing high costs remain.

On the other hand, when a pigment is used, there are advantages such as strong light resistance, compatibility with a plurality of fiber types, and no need for a color material removal step, and its simplicity is preferred over dyes.
In the pigment ink, a binder component for fixing the pigment is required. In the case of the screen method, the robustness can be secured by increasing the amount of the resin serving as the binder, but in the case of the ink jet method, the amount of the resin added is limited from the viewpoint of ink viscosity and dischargeability. As a result, problems remain in pigment fixing and fastness.

  In the case of inkjet ink, as an attempt to improve fastness, a method of coating a pigment with a polymer having a crosslinked structure is known (Patent Document 1). However, the adsorptive power between the pigment and the fiber is due to the van der Waals force acting between the resin covering the pigment and the fiber, or the anchor effect of the resin. Couldn't get.

  There is also known a technique of improving friction fastness by avoiding that the pigment is directly rubbed by using a core / shell structure in which the pigment is coated with a resin (Patent Document 2). However, the friction fastness achieved (JIS L0848 1996) is about 2-3 or higher, and higher fastness is required.

  Furthermore, it contains a pigment coated with a resin and a pigment ink for inkjet printing (Patent Document 3) containing a blocked isocyanate as a crosslinking agent, and a pigment, a resin having a carboxy group, and a water-soluble melamine resin. Ink (Patent Document 4) is known. In these, a crosslinking agent such as a blocked isocyanate or a melamine resin takes a crosslinked structure with the resin by heat treatment, thereby improving the fastness to washing. However, sufficient friction fastness, particularly wet friction fastness, could not be ensured.

JP 2002-338859 A JP 2004-51820 A JP 2003-268271 A JP 2004-67807 A

  Accordingly, the present invention provides a printing inkjet ink capable of providing a printed printed matter (printed matter or printed matter) having excellent fastness to washing as well as fastness to friction, and a method for producing a printed matter using the same. The issue is to provide.

According to one aspect of the present invention, comprising a pigment, a water dispersible resin, a crosslinking agent, and water,
The water-dispersible resin contains 1 to 3 parts by weight of a resin having a film elongation of 650 to 1200% and a tensile strength of 15 to 55 N / mm ² with respect to 1 part by weight of the pigment; and the crosslinking agent As a printing ink-jet ink (hereinafter, also simply referred to as “ink”) containing 0.1 to 2.5 parts by weight of a blocked isocyanate compound relative to 1 part by weight of the water-dispersible resin. .
According to another aspect of the present invention, there is provided a method for producing a printed material, comprising a step of printing the ink according to the one aspect of the present invention on a material to be printed by an ink jet recording method.

  The ink according to the present invention includes a predetermined amount of a resin having a specific film elongation and tensile strength (film strength) as a water-dispersible resin that serves as a binder for fixing a pigment to a printed material such as cloth or leather, and is crosslinked. It contains a predetermined amount of a blocked isocyanate compound as an agent. With this configuration, the ink according to the present invention forms a strong resin film (ink film) on the printing material, and can improve not only the fastness to washing but also the fastness to friction, particularly the fastness to wet friction.

The ink according to the present invention has a composition containing a pigment, a water-dispersible resin (resin emulsion) serving as a binder for the pigment, a crosslinking agent, and water.
The water dispersible resin includes a resin having a film elongation of 650 to 1200% and a tensile strength (film strength) of 15 to 55 N / mm ² .

In order to ensure the fastness to washing and rubbing against a base material that is easily stretchable such as a fabric and a base material such as leather that requires bending resistance (a property that the ink film does not break even when bent), The ease of expansion and contraction of the ink film, that is, the film elongation is important. That is, since the ink film has an elongation that can expand and contract following the expansion and contraction of the fabric, the ink film can be prevented from being broken and cracked, and the fastness to washing and friction can be ensured. On the other hand, if the elongation of the resin is too large, the adhesion of the ink film to the substrate decreases, and the washing / friction fastness decreases, which is not preferable. This is presumably because the viscosity of the ink film becomes too strong to exert a sufficient anchor effect on the fiber surface.
From such a viewpoint, the film elongation of the water dispersible resin is preferably in the range of 650 to 1200%. In the present invention, it is considered that the resin is crosslinked by a crosslinking agent after printing, and the elongation of the resin itself is lower than before the crosslinking. However, the above range is used in combination with a crosslinking agent that would bring about such an effect. This is a range that has been found to be particularly preferable in the configuration. The film elongation of this resin is more preferably 650 to 1000%.

Regarding the strength of the ink film, the tensile strength of the resin is important. When the tensile strength is 15 N / mm ² or more, the ink film can be prevented from being scraped by frictional force, and the fastness to friction can be increased. On the other hand, if the tensile strength exceeds 55 N / mm ² , the film becomes too hard when the ink film is formed, and the texture is lowered. The tensile strength is further preferably at 20 N / mm ² or more, more preferably 30 N / mm ² or more, and more preferably 33~45N / mm ^2.

The water-dispersible resin may be a self-emulsifying type into which a hydrophilic component necessary for stably dispersing in water is introduced, or may be water-dispersible by using an external emulsifier.
The type of water-dispersible resin is not particularly limited in view of the object of the present invention as long as it has the above-described film elongation and tensile strength, but it has a high degree of freedom in design and therefore easily obtains desired film properties. It is preferable to use a urethane resin.
The urethane resin is not particularly limited as long as it has a urethane skeleton and has water dispersibility. Among them, an anion such as a carboxy group, a sulfo group, and a hydroxy group is particularly preferable from the viewpoint of material compatibility with an inkjet head. It is preferable that it is an anionic urethane resin which has a functional functional group.
Specific examples of urethane resins that satisfy the above characteristics include Superflex 460, 460s, 840, etc., manufactured by Daiichi Kogyo Seiyaku Co., Ltd .; Takelac WS-6021, W, manufactured by Mitsui Chemicals Polyurethanes Co., Ltd. -512-A-6 and the like. These are anionic resins having a urethane skeleton.

As this urethane resin, in addition to the urethane bond, a polyether type urethane resin having an ether bond in the main chain, a polyester type urethane resin having an ester bond in the main chain, a polycarbonate type urethane resin having a carbonate bond in the main chain, etc. Can be used. Of these, polycarbonate type urethane resins and polyester type urethane resins can be preferably used.
These urethane resins can be used in combination of multiple types. Furthermore, water-dispersible resins other than the resins having the physical properties defined in the present invention within the range not impairing the effects of the present invention, such as acrylic resins, acrylic-styrene resins, urethane resins, vinyl acetate resins, acrylic-vinyl acetates. You may use resin etc. together.

A blocked isocyanate compound is blended as a crosslinking agent for the urethane resin. As the crosslinking agent for urethane resin, there are generally melamine type, block isocyanate type, epoxy type, carbodiimide type, oxazoline type, etc., but in the present invention, a blocked isocyanate type compound is preferable from the viewpoint of reactivity.
The blocked isocyanate compound means a compound in which an isocyanate group is protected with a blocking agent, and the blocking agent is dissociated by overheating, whereby an active isocyanate group is regenerated. It is conceivable that the isocyanate group generated by this heating reacts with an active hydrogen site on the urethane resin or fabric to form a crosslinked structure such as a urethane bond or a urea bond. Examples of the blocking agent include phenolic compounds, aromatic secondary amine compounds, cyclic amine compounds, lactam compounds, oxime compounds, and sodium sulfite.

  More specifically, the blocked isocyanate compound preferably has a urethane skeleton. For example, each product such as Elastron series and Elastron BN series manufactured by Daiichi Kogyo Seiyaku Co., Ltd. can be used, and more preferably, Elastron E37, H-3, C-52, MF25, W-22, S-24. BN-08, BN-11, BN-27, BN-45, BN-69, BN-77 and the like can be used as commercial products.

It is considered that the cross-linking agent cross-links the resins with each other and cross-links the functional group of the resin and the functional group of the printing material such as the fabric. From the standpoint of robustness, the ink film is generally required to have a film thickness of about 10 to 300 μm. However, such a thick film impairs the texture inherent to the printed material such as cloth.
In the present invention, by using a crosslinking agent, sufficient fastness can be ensured without forming a thick film as in the prior art, and therefore the texture inherent to the printed material is not impaired.
In particular, an ink film having strong adhesion and fastness can be obtained by combining a urethane resin and an isocyanate compound.

  The blending amount of the crosslinking agent is preferably 0.15 parts by weight or more from the viewpoint of securing fastness, in particular wet friction fastness, with respect to 1 part by weight of the water-dispersible resin, from the viewpoint of avoiding a decrease in texture. The amount is preferably 2.5 parts by weight or less, and more preferably from 0.15 to 0.6 parts by weight from the viewpoint of the film properties of the resulting ink film.

As the pigment, those generally used in the technical field can be arbitrarily used. A white pigment is used for white ink, and a color pigment other than white is used for color ink.
Specific examples of the white pigment include inorganic pigments such as titanium oxide, zinc white, zinc sulfide, antimony oxide, and zirconium oxide. Besides the inorganic pigment, hollow resin fine particles or polymer fine particles can also be used.
The average particle size of the pigment is preferably 100 to 500 nm. When the average particle diameter of the pigment is less than 100 nm, the hiding power tends to be insufficient, and when it exceeds 500 nm, the ejection stability tends to be insufficient.

  Of these, titanium oxide is preferably used from the viewpoint of hiding power. Similarly, the average particle diameter of titanium oxide is preferably 100 to 500 nm. When titanium oxide is used, it is preferable to use one that has been surface-treated with alumina or silica in order to suppress the photocatalytic action. The surface treatment amount is preferably about 5 to 20% by weight in the pigment.

  Examples of color pigments include organic pigments such as azo, phthalocyanine, dye, condensed polycyclic, nitro, and nitroso (brilliant carmine 6B, lake red C, watching red, disazo yellow, hanza yellow, phthalocyanine blue, etc. , Phthalocyanine green, alkali blue, aniline black, etc.); metals such as cobalt, iron, chromium, copper, zinc, lead, titanium, vanadium, manganese, nickel, metal oxides and sulfides, and ocher, ultramarine, bitumen, etc. Inorganic pigments, furnace carbon black, lamp black, acetylene black, channel black, and other carbon blacks can be used.

Any one of these pigments may be used alone, or two or more of these pigments may be used in combination.
The blending amount of the pigment varies depending on the kind of the pigment to be used, but from the viewpoint of ensuring necessary color development, it is preferably contained in the ink in an amount of about 1 to 30% by weight. More preferably.

In order to stably disperse the pigment in the ink, it is preferable to use a known pigment dispersant represented by a polymer dispersant or a surfactant.
Examples of the polymer dispersant include commercially available Solsperse series (Solsperse 20000, 27000, 41000, 41090, 43000, 44000) manufactured by Nippon Lubrizol Co., Ltd. and Johncrill series (John Crill 57 manufactured by Johnson Polymer Co., Ltd.). , 60, 62, 63, 71, 501), polyvinylpyrrolidone K-30, K-90 manufactured by Daiichi Kogyo Seiyaku Co., Ltd., and the like.
Examples of the surfactant include anionic surfactants such as Kao's Demol series (Demol N, RN, NL, RNL, T-45), and Kao's Emulgen series (Emulgen A-60). , A-90, A-500, B-40, L-40, 420) and the like.

These pigment dispersants can be used in combination of two or more.
The blending amount in the ink when using the pigment dispersant is different depending on the kind and is not particularly limited. However, generally, the weight ratio of the active ingredient (solid content) is 0.005 to 0.5 with respect to the pigment 1. It is preferably used in a range.

Furthermore, a self-dispersing pigment whose surface is modified with a hydrophilic functional group can also be used. Examples of the commercially available products include CAB-O-JET series (CAB-O-JET200, 300, 250C, 260M, 270C) manufactured by Cabot Corporation, and CW-1 and CW-2 manufactured by Orient Chemical Co., Ltd.
You may use the microencapsulated pigment which coat | covered the pigment with resin.

The content of the water-dispersible resin in the ink (the total amount including the water-dispersible resin other than the resin having the physical properties defined in the present invention) is 1 to 1 with respect to the pigment 1 in weight ratio. A range of 3 is preferable. Thereby, the compounding effect of water-dispersible resin can be exhibited appropriately. That is, if the weight ratio of the resin is less than 1 with respect to the pigment 1, there is a possibility that sufficient washing / friction fastness may not be ensured and sufficient hiding power may not be exhibited. On the other hand, if the amount of the resin exceeds 3, the ink viscosity may be affected and printability may be impaired.
Furthermore, from the viewpoint of securing wet friction fastness, the sum of the contents of the water-dispersible resin and the crosslinking agent is preferably 1.15 to 3.5 with respect to the pigment 1 in terms of weight ratio, and 2 to 3 .5 is more preferable.

From the viewpoint of viscosity adjustment, water is preferably contained in the ink in an amount of 20 to 80% by weight, and more preferably 30 to 70% by weight.
Further, from the viewpoint of avoiding clogging of the head after leaving the ink and ensuring easy return, the amount of the water-dispersible resin added is preferably 30% by weight or less in the ink, and 15% by weight or less. More preferably, it is 10% by weight or less.

  The ink preferably contains a water-soluble organic solvent that is liquid at room temperature and can be dissolved in water, from the viewpoints of viscosity adjustment and moisturizing effect. For example, lower alcohols such as methanol, ethanol, 1-propanol, isopropanol, 1-butanol, 2-butanol, isobutanol, 2-methyl-2-propanol; ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, penta Glycols such as ethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol; glycerin; acetins (monoacetin, diacetin, triacetin); triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monopropyl ether, Triethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, tetraethylene Glycol monoethyl ether, tetraethylene glycol dimethyl ether, derivatives of glycols such as tetraethylene glycol diethyl ether; triethanolamine, 1-methyl-2-pyrrolidone, beta-thiodiglycol, may be used sulfolane. Polyethylene glycol having an average molecular weight of 200, 300, 400, 600 or the like in the range of 190 to 630, diol type polypropylene glycol having an average molecular weight of 400 or the like in the range of 200 to 600, average molecular weight of 300, 700, or the like A low molecular weight polyalkylene glycol such as a triol type polypropylene glycol having an average molecular weight of 250 to 800 can also be used.

These water-soluble organic solvents can be used alone or in combination of two or more.
The water-soluble organic solvent is preferably contained in the ink in an amount of 1 to 80% by weight, more preferably 10 to 60% by weight, from the viewpoints of viscosity adjustment and moisture retention effect.

In addition to the above components, the ink may optionally include a wetting agent (moisturizing agent), a surface tension adjusting agent (surfactant), an antifoaming agent, a fixing agent, a pH adjusting agent, an antioxidant, an antiseptic, and the like. Can be appropriately contained.
As the wetting agent, polyhydric alcohols can be used. As the surface tension adjusting agent, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, a nonionic surfactant, or a polymer-based, silicone-based or fluorine-based surfactant can be used.

  By blending this surfactant, it is preferable because ink can be stably ejected by an ink jet method and ink permeation can be appropriately controlled. The amount added (as a total amount when a surfactant is used as a pigment dispersant) varies depending on the type of the surfactant, but may be in the range of 0.1 to 10% by weight in the ink. preferable. When a large amount of a surfactant is added beyond this range, the surface tension of the ink is lowered, and as a result, the penetration of the ink on the fabric becomes too fast, thereby hindering the concealability and color developability.

Specifically, as anionic surfactants, Kao Corporation's Emar series (Emar 0, 10, 2F, 40, 20C), Neopelex series (Neopelex GS, G-15, G-25, G -65), Pelex series (Pelex OT-P, TR, CS, TA, SS-L, SS-H) and Demolle series (Demol N, NL, RN, MS).
Examples of the cationic surfactant include an acetamine series (acetamin 24, 86) manufactured by Kao Corporation, a coatamine series (coatmine 24P, 86P, 60W, 86W), and a sanizole series (sanizole C, B-50). Is mentioned.

Nonionic surfactants include acetylene glycol surfactants such as Surfynol series (Surfinol 104E, 104H, 420, 440, 465, 485) manufactured by Air Products, and the Emulgen series (Emulgen, manufactured by Kao Corporation). 102KG, 103, 104P, 105, 106, 108, 120, 147, 150, 220, 350, 404, 420, 705, 707, 709, 1108, 4085, 2025G) and other polyoxyethylene alkyl ether surfactants Can be mentioned.
Examples of amphoteric surfactants include the Amphitol series (Amphithol 20BS, 24B, 86B, 20YB, 20N) manufactured by Kao Corporation.

  In order to adjust the viscosity and pH of the ink, an electrolyte can be added to the ink. Examples of the electrolyte include sodium sulfate, potassium hydrogen phosphate, sodium citrate, potassium tartrate, and sodium borate, and two or more kinds may be used in combination. Sulfuric acid, nitric acid, acetic acid, sodium hydroxide, potassium hydroxide, ammonium hydroxide, triethanolamine, and the like can also be used as an ink thickening aid or pH adjuster.

  By blending an antioxidant, it is possible to prevent the ink components from being oxidized and improve the storage stability of the ink. As the antioxidant, for example, L-ascorbic acid, sodium L-ascorbate, sodium isoascorbate, potassium sulfite, sodium sulfite, sodium thiosulfate, sodium dithionite, sodium pyrosulfite can be used.

  By blending a preservative, the ink can be prevented from being spoiled and the storage stability can be improved. Examples of preservatives include 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, and 1 Isothiazolone preservatives such as 1,2-benzisothiazolin-3-one; triazine preservatives such as hexahydro-1,3,5-tris (2-hydroxyethyl) -s-triazine; 2-pyridinethiol sodium-1- Pyridine / quinoline preservatives such as oxide and 8-oxyquinoline; Dithiocarbamate preservatives such as sodium dimethyldithiocarbamate; 2,2-dibromo-3-nitrilopropionamide, 2-bromo-2-nitro-1,3 -Propanediol, 2,2-dibromo-2-nitroethanol, 1,2-dibromo-2,4-dicia Brominated organic preservatives such as butane; p-hydroxybenzoate, p- hydroxybenzoate ethyl, potassium sorbate, sodium dehydroacetate, can be used salicylic acid.

  The viscosity of the ink can be adjusted as appropriate, but is preferably 1 to 30 mPa · s, for example, from the viewpoint of ejection properties. This viscosity is the ink viscosity at 10 Pa when the shear stress is increased from 0 Pa at a rate of 0.1 Pa / s at 23 ° C.

  The surface tension of the ink is preferably 30 to 50 mN / m. In order to control the penetration of the ink, it is necessary to control the surface tension of the ink and adjust the penetration speed into the fabric. When the surface tension of the ink is less than 30 mN / m, the permeation speed of the ink is increased and the ink film cannot be sufficiently formed on the fabric surface. On the other hand, if the surface tension of the ink is greater than 50 mN / m, the ejection properties from the inkjet nozzles are lowered, which is not preferable.

Next, the manufacturing method of the printed matter (printed printed matter) using the ink which concerns on this invention is demonstrated. Examples of the printed material include fabric, artificial leather, natural leather, and the like. As the fabric, a fabric made of any natural or synthetic fiber such as cotton, silk, wool, hemp, nylon, polyester, rayon, or the like can be used. .
The ink according to the present invention can provide a printed material having high fastness as described above with respect to fabrics of various materials and leathers that are required to have bending resistance. .

  Printing is performed by an inkjet recording method. The ink jet printer to be used may be of any method such as a piezo method, an electrostatic method, or a thermal method, and ink droplets are ejected from an ink jet head based on digital signals. Is deposited on the fabric.

  If the fabric is a dark color, the color developability of the ink may be reduced. Therefore, by first printing the white ink on the printed portion on the fabric and overlaying the color ink thereon, a printed matter with good color development can be obtained. On the other hand, when the fabric is white, or on a material to be printed (such as leather) other than the fabric, it is possible to obtain a printed material with excellent color development by simply printing the ink according to the present invention. In this case, since it is not necessary to overlap the ink, the texture and air permeability of the printed portion are excellent.

When printing white ink and color ink on a dark fabric, the contact angle between the surface of the coating film on which the white ink is printed and the color ink is determined from the viewpoint of appropriately controlling the permeability of the color ink. It is preferably 50 to 80 ° at 0.5 second and 20 to 70 ° at 2 seconds. More preferably, it is 65 to 80 ° at the time of 0.5 seconds. At 2 seconds, the angle is more preferably 25 to 70 °, and further preferably 40 to 70 °. Furthermore, it is preferable that it is 30-70 degrees at the time of 5 seconds. Therefore, it is preferable to select a combination of white ink and color ink that can provide such a contact angle.
When printing white ink and color ink, it is preferable that at least the color ink, more preferably both the white ink and the color ink, are inks according to the present invention.

It is preferable to perform a heat treatment at about 100 to 180 ° C. on the substrate after ink printing. Accordingly, the ink can be dried, and the water-dispersible resin can be formed while the resin such as urethane resin is cross-linked, thereby forming a strong ink film. When printing white ink and color ink, it is only necessary to perform heat treatment after printing color ink.
The heat treatment conditions are not particularly limited, but it is preferable to perform the heat treatment at about 160 ° C./60 seconds, for example.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. Hereinafter, “% by weight” is referred to as “%”, and “part by weight” is referred to as “part”.
The measuring method of each physical property is as follows.

<Tension>
A water-dispersible resin is applied onto the polytetrafluoroethylene sheet so that the film thickness after drying is 500 μm, dried at room temperature for 15 hours, and further dried at 80 ° C. for 6 hours and 120 ° C. for 20 minutes. After performing, it peeled from the sheet | seat and the water dispersible resin film was created.
Using a Tensilon universal testing machine RTC-1225A (manufactured by Orientec Co., Ltd.), the film elongation of the obtained resin film was measured at a measurement temperature of 20 ° C. and a measurement speed of 200 mm / min.

<Film elongation>
A water-dispersible resin film is prepared in the same manner as the tensile strength measurement, the resin film is stretched under the same measurement conditions, and the length of the resin film is measured until it breaks. expressed.

<Preparation of color (black) ink>
Each component was mixed so as to have the composition shown in Tables 1 and 2 (both are expressed in solid content), and coarse particles were removed with a 5 μm membrane filter to prepare black inks of Examples and Comparative Examples. . More specifically, in the example of Example 1, 30 parts of a self-dispersing pigment, 11.84 parts of a water dispersible resin (1), 14.52 parts of a crosslinking agent (1), 3 parts of a surfactant, 10 parts of ethylene glycol Then, 10 parts of glycerin and 20.64 parts of ion-exchanged water were mixed.

As the self-dispersing pigment, carbon black self-dispersing pigment ("CW-2" manufactured by Orient Chemical Co., Ltd., water-dispersed pigment having a solid content of 15%) was used.
As shown in Table 3, each urethane resin was used as the water-dispersible resins (1) to (7), and an acrylic resin (nonionic) was used as the water-dispersible resin (8).
As the crosslinking agent (1), “Elastolon BN-77” (produced by Daiichi Kogyo Seiyaku Co., Ltd., an aqueous dispersion with a solid content of 31%), which is a blocked isocyanate compound, was used, and the oxazoline compound as the crosslinking agent (2). “Epocross WS-700” (manufactured by Nippon Shokubai Co., Ltd., aqueous dispersion with a solid content of 40%) was used. The surfactant was “Surfinol 465” manufactured by Air Products, and ethylene glycol and glycerin used reagents manufactured by Wako Pure Chemical Industries, Ltd.

Using the obtained inks, textile printing was performed as follows. A white T-shirt made of 100% cotton was used as the fabric.
Ink was introduced into a textile printer “MMP813BT” manufactured by Mastermind, solid printing of 1440 dpi × 720 dpi and 80 mm × 80 mm was performed with black ink, and heat treatment was performed at 160 ° C. for 1 minute.

The obtained printed matter was evaluated as follows.
<Washing fastness>
Each printed material was washed 10 times using a fully automatic washing machine ASW-45A1 manufactured by Sanyo Electric Co., Ltd., and the degree of fading was evaluated using a discoloration gray scale.
A: Grade 5 B: Grade 4 to Grade 4 C: Grade 3-4 to Grade 4 D: Grade 3 or below

<Friction fastness>
The test was conducted using a type I tester according to the method defined in JIS L0849. The dry friction was tested according to the dry test specified in JIS L0849, and the wet friction was tested according to the wet test specified in JIS L0849, and evaluated using a contaminated gray scale.
A: Grade 4-5 to Grade 5 B: Grade 3-4 to Grade 4 C: Grade 2-3 to Grade 3 D: Grade 2 or below

As for the texture of the printed matter, a sensory evaluation was performed on the softness when the printed portion was folded in half, and it was judged that the soft and easy to bend were good and the repulsion and hard to bend were bad.
The obtained result is combined with Tables 1-2, and is shown.
In the inks of the examples, strong washing fastness and friction fastness were obtained, and the texture was also good. On the other hand, the ink of the comparative example could not obtain sufficient fastness.
Comparative Examples 4 to 6 are examples using water-dispersible resins (5) to (7) whose film elongation was outside the range of the present invention, and Comparative Example 8 was that the tensile strength was outside the range of the present invention. This is an example using a water dispersible resin (8). From these comparative examples, it was shown that the elongation and strength of the water-dispersible resin are important.

Claims (4)

A pigment, a water dispersible resin, a crosslinking agent, and water,
As the water-dispersible resin, 1 to 3 parts by weight of a resin having a film elongation of 650 to 1200% and a tensile strength of 15 to 55 N / mm ² with respect to 1 part by weight of the pigment; and
A printing inkjet ink containing 0.1 to 2.5 parts by weight of a blocked isocyanate compound as the crosslinking agent with respect to 1 part by weight of the water-dispersible resin.   The ink for textile printing of Claim 1 whose content of the said block isocyanate type compound is 0.15-0.6 weight part with respect to 1 weight part of the said water-dispersible resin.   The ink for textile printing of Claim 1 or 2 whose said resin is a urethane resin.   A method for producing a printed material, comprising a step of printing the ink-jet printing ink according to any one of claims 1 to 3 on a material to be printed by an ink jet recording method.