JP2008231618A - Fabric for inkjet printing, method for inkjet printing and print - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fabric for inkjet printing maintaining a touch feeling possessed by the fabric itself and affording a print of a high-density image having excellent color fastness to washing with hardly any change in color and pretreatment marks, to provide a method for inkjet printing using the fabric for the inkjet printing and to provide the excellent print obtained by the method for printing. <P>SOLUTION: The fabric for inkjet printing is used for a method for inkjet printing by which an ink containing a dispersant having an anionic group and a pigment or an ink containing a pigment having the anionic group is applied. The fabric for inkjet printing comprises a thermoplastic hydrophobic resin having ≥-35 to ≤45°C glass transition temperature and a cationic surfactant having ≤900 molecular weight. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fabric for ink jet printing for performing ink jet recording using a pigment ink, an ink jet textile printing method, and a printed matter obtained by the textile printing method.

  Conventionally, dye ink has been used in a textile printing method using an ink jet recording method. Since there are vivid pigment compounds of various shades in dyes, the use of dye ink has the advantage that a clear pattern with excellent color tone can be displayed on the fabric. However, when a dye ink is used, the fabric must be post-treated by a method corresponding to the dye contained in the dye ink for the purpose of fixing the dye to the fiber after the dyeing step. For this reason, it leads to an increase in the number of processes and costs, and there is a problem that it is necessary to consider productivity problems and environmental pollution, such as the necessity of waste liquid treatment.

  In contrast, when pigment ink is used, the color tone and sharpness are generally inferior to those when dye ink is used, but because the pigment has excellent light resistance and water resistance, printing with good fastness is possible. There is an advantage that things can be obtained. In addition, when pigment ink is used for textile printing using the ink jet recording method, there is an advantage that a complicated post-treatment for the fabric is unnecessary as compared with the case where dye ink is used. For these reasons, an ink-jet textile printing method using a pigment ink has attracted attention at present.

  Incidentally, as a recording medium widely used in the ink jet recording method, a medium having an ink receiving layer containing inorganic fine particles such as silica and alumina and a water-soluble polymer is generally used. The presence of the ink receiving layer improves the quality of the ink jet recorded image. However, when the above-described technique is applied when the recording medium is a fabric, the texture of the fabric is impaired, and the printed matter obtained is inferior in washing fastness.

  In contrast, when a fabric is used as a recording medium, a hydrophobic low molecular weight compound and a cationic resin having a number average molecular weight of 1,000 or more are applied to the fabric, and image formation is performed using a pigment ink on the fabric containing these compounds. Has been proposed (see Patent Document 1). This fabric maintains the texture of the fabric itself, and it is said that high-density printed matter can be obtained when ink jet recording is performed using a pigment ink having an anionic substance. However, according to the study by the present inventors, the cationic resin has a problem that the trapping property of the pigment is not good because the reaction with the anionic substance does not occur quickly. Moreover, since the said cationic resin has colors, such as yellow, or discolors, it may impair the color which cloth itself has. In particular, when the cationic resin is applied to a part of the fabric and processed, the fabric may be partially discolored to become a pretreatment trace, and the product value as a fabric for inkjet printing or printed matter The product value may be impaired.

JP 2001-140174 A

  Accordingly, an object of the present invention is to provide a high density image printed matter having excellent washing fastness while maintaining the texture of the fabric itself, and having little color change and pre-processing traces. Is to provide. Another object of the present invention is to provide an ink-jet printing method using the above-described ink-jet printing fabric and a printed matter obtained by the printing method.

  The above object is achieved by the following means. That is, the fabric for inkjet printing of the present invention is an inkjet for use in an inkjet printing method to which an ink containing a dispersant and a pigment having an anionic group or an ink containing a pigment having an anionic group is applied. A textile for printing, comprising a thermoplastic hydrophobic resin having a glass transition temperature of −35 ° C. or higher and 45 ° C. or lower and a cationic surfactant having a molecular weight of 900 or lower.

  In another embodiment of the present invention, an ink containing a dispersant and a pigment having an anionic group, or an ink containing a pigment having an anionic group is used for the above-described fabric for inkjet printing of the present invention. An ink jet printing method characterized in that ink jet recording is performed, and then ink of a fabric on which ink jet recording has been performed is heat-fixed.

  Another embodiment of the present invention is a printed matter manufactured by the above-described inkjet printing method of the present invention.

  According to the present invention, although the pretreatment is performed, the color of the fabric is not deteriorated or the pretreatment trace is not generated, the texture of the fabric itself is maintained, and excellent washing fastness is achieved at a high concentration. Provided is a fabric for ink jet printing which can obtain a printed product having properties. In addition, according to the present invention, there is provided an ink-jet printing method in which the above-described excellent printed matter can be obtained by using the above-described ink-jet printing fabric, and further, a high-quality printed matter is provided by the printing method.

  Hereinafter, the present invention will be described in more detail with reference to the best mode for carrying out the invention. The fabric of the present invention relates to a fabric for printing for use in an inkjet printing method to which an ink containing a dispersant and a pigment having an anionic group or an ink containing a pigment having an anionic group is applied. It has the characteristics of. That is, the fabric is characterized by comprising a thermoplastic hydrophobic resin having a glass transition temperature of −35 ° C. or higher and 45 ° C. or lower and a cationic surfactant having a molecular weight of 900 or lower. Examples of the fabric for ink jet textile printing of the present invention include those obtained by treating with a pretreatment liquid containing a thermoplastic hydrophobic resin that satisfies the requirements defined above and a cationic surfactant. These materials will be described.

  The thermoplastic hydrophobic resin used in the ink-jet textile fabric of the present invention has a glass transition temperature of −35 ° C. or higher and 45 ° C. or lower. In particular, it is preferable to use a glass transition temperature of −25 ° C. or higher and 20 ° C. or lower. If the glass transition temperature is less than -35 ° C, the abrasion resistance of the image formed on the fabric of the present invention may be reduced, and if it exceeds 45 ° C, the adhesion of the hydrophobic resin and the texture of the fabric are deteriorated. There is a case. Examples of such thermoplastic hydrophobic resins include acrylic copolymer resins, polyurethane resins, vinyl acetate resins, and vinyl chloride. In this invention, it is preferable to use as an emulsion (emulsion) which has these resins as a main component. The present invention is not limited to the above, and any elastomer emulsion used for ordinary pigment printing can be used. In the present invention, among the above, an emulsion of an acrylic copolymer resin is preferably used.

  The fabric of the present invention is for inkjet printing, and after performing inkjet recording with the pigment ink on the fabric, the ink on the fabric is heat-fixed, but it has excellent adhesiveness while maintaining the texture of the fabric. A printed product having an ink image can be obtained. Since the fabric of the present invention contains the above-described thermoplastic hydrophobic resin, the adhesion between the fabric, the hydrophobic resin, the dispersant and the pigment can be increased by heating. The ink-jet textile fabric of the present invention having the above-described configuration is treated with, for example, a pretreatment liquid containing a thermoplastic hydrophobic resin (hydrophobic resin) that satisfies the above-described requirements and a cationic surfactant. can get. The content of the hydrophobic resin in the pretreatment liquid used at this time is preferably 0.5% by mass to 7% by mass, and more preferably 3% by mass to 5% by mass. If the content of the hydrophobic resin is less than 0.5% by mass, the effect of improving the adhesiveness may not be obtained, and if it exceeds 7% by mass, the content of the hydrophobic resin is too high. It may be damaged.

  The fabric of the present invention is characterized by containing a cationic surfactant having a molecular weight of 900 or less together with the above-described thermoplastic hydrophobic resin. According to the study by the present inventors, a cationic surfactant having a molecular weight of 900 or less has a higher surface activity than a surfactant having a molecular weight of more than 900, and also has a high reactivity with an anionic substance. For this reason, the fabric containing the cationic surfactant improves the scavenging property for the dispersant and pigment having an anionic group constituting the ink and the pigment having an anionic group, and is excellent at a high concentration. It is possible to provide a printed matter exhibiting washing fastness. In addition, the surfactant having a molecular weight of 900 or less does not have a color such as yellow like a conventionally used cationic resin, and is usually colorless or light color. Therefore, when used for pretreatment of a fabric, However, the color of the fabric is not impaired and no pretreatment trace is generated.

Specific examples of the cationic surfactant having a molecular weight of 900 or less include the following.
Primary, secondary or tertiary amine salt type compounds such as hydrochlorides and acetates such as laurylamine, stearylamine or rosinamine.
Quaternary ammonium salt type compounds such as lauryltrimethylammonium chloride, lauryldimethylbenzylammonium chloride, cetyltrimethylammonium chloride or benzalkonium chloride.
Amino acid type amphoteric surfactant or betaine type compound etc. adjusted to below the isoelectric point.
Amphoteric surfactants that are cationic in a certain pH range.
Of course, the present invention is not limited to these.

  In the present invention, among the above-mentioned cationic surfactants, it is particularly preferable to use a quaternary ammonium salt type compound. Although the cationic surfactant having a molecular weight of 900 or less cannot itself contribute to the water resistance of the printed matter, the ink is synergistically combined with the specific thermoplastic hydrophobic resin described above. Improve the scavenging ability of dispersants and pigments. As a result, by using the fabric of the present invention for ink jet recording, a printed matter having excellent washing fastness at a high concentration can be obtained.

  The textile for textile printing of the present invention can be obtained by treating with a pretreatment liquid containing the above-described hydrophobic resin and a cationic surfactant having a molecular weight of 900 or less. The content of the surfactant is preferably as follows. That is, the content of the cationic surfactant in the pretreatment liquid is preferably 0.05% by mass to 5% by mass, and more preferably 0.1% by mass to 1% by mass. If the content of the cationic surfactant is less than 0.05% by mass, the above effect may not be obtained in some cases. On the other hand, even if the content of the cationic surfactant exceeds 5% by mass, further effects may not be expected.

  Further, the mass ratio (thermoplastic hydrophobic resin: cationic surfactant) of the hydrophobic resin and the surfactant having a molecular weight of 900 or less in the pretreatment liquid is from 140: 1 to 1:10. It is preferable to use those. That is, the content (mass%) ratio in the pretreatment liquid is preferably (thermoplastic resin content) / (nitrogen-containing cationic substance content) = 0.1 or more and 140 or less. According to the study by the present inventors, in this case, a particularly high synergistic effect is obtained, and a printed matter that maintains the texture and color of the fabric and achieves higher washing fastness at a higher concentration is obtained. .

  In the pretreatment liquid used in the present invention, a liquid medium containing water or water and a water-soluble organic solvent as a component other than the hydrophobic resin and the surfactant described above, and if necessary, a pH adjuster , A penetrating agent or a crosslinking agent may be contained.

  The method for applying the specific thermoplastic hydrophobic resin used in the present invention and the specific cationic surfactant to the fabric is not particularly limited. It may be a method using a pretreatment liquid obtained by mixing the above-described hydrophobic resin and a surfactant having a molecular weight of 900 or less, or a method of separately applying these components. Specific examples of the application method include known methods such as a pad method, a spray method, a printing method, and a coating method.

  The ink-jet textile fabric of the present invention may be made of any material. Examples thereof include a cloth made of cotton, silk, hemp, rayon, acetate, nylon, or polyester fiber, and a blended cloth made of two or more of these fibers.

  Next, the inkjet printing method of the present invention will be described. In the inkjet printing method of the present invention, first, inkjet recording is performed using the dispersant and the pigment having an anionic group or the ink containing the pigment having the anionic group on the inkjet printing fabric of the present invention having the above-described configuration. Do. Thereafter, the ink of the fabric on which ink jet recording has been performed is heat-fixed. The ink used in the textile printing method of the present invention preferably contains water or a liquid medium containing water and a water-soluble organic solvent in addition to the above components. In addition, the ink may contain various additives such as a pH adjuster, an antifungal agent, a surfactant, or a resin. Moreover, the said inkjet recording can be performed with the inkjet recording method and inkjet recording apparatus which are mentioned later.

  Examples of the water-soluble organic solvent constituting the ink include glycols, glycol ethers, nitrogen-containing solvents, and the like, and one or more of these can be appropriately selected and used. As said surfactant, the following can be used, for example. Examples include anionic surfactants such as fatty acid salts, higher alcohol sulfates, liquid fatty oil sulfates, and alkylallyl sulfonates. Moreover, nonionic surfactants, such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl esters, or polyoxyethylene sorbitan alkyl esters, are mentioned. These surfactants can be used by appropriately selecting one kind or two or more kinds.

  As the pigment, for example, the following can be used. As the pigment used in the black ink, carbon black can be used. Specifically, carbon black such as furnace black, lamp black, acetylene black, or channel black can be used. These can be used by appropriately selecting one kind or two or more kinds. Of course, commercially available carbon blacks as listed below and newly prepared carbon blacks can also be used.

  Ray Van: 7000, 5750, 5250, 5000ULTRA, 3500, 2000, 1500, 1250, 1200, 1190ULTRA-II, 1170, 1255 (above Colombia). Black Pearls L, Legal: 400R, 330R, 660R, Mogul L, Monak: 700, 800, 880, 900, 1000, 1100, 1300, 1400, Vulcan XC-72R (manufactured by Cabot). Color black: FW1, FW2, FW2V, FW18, FW200, S150, S160, S170, Printex: 35, U, V, 140U, 140V, Special Black: 6, 5, 4A, 4 (manufactured by Degussa). No. 25, no. 33, no. 40, no. 47, no. 52, no. 900, no. 2300, MCF-88, MA600, MA7, MA8, MA100 (manufactured by Mitsubishi Chemical).

  Specific examples of organic pigments used in color inks include those listed below. Insoluble azo pigments such as toluidine red, toluidine maroon, Hansa yellow, benzidine yellow and pyrazolone red. Soluble azo pigments such as Ritolol Red, Helio Bordeaux, Pigment Scarlet, and Permanent Red 2B. Derivatives from vat dyes such as alizarin, indanthrone and thioindigo maroon. Phthalocyanine pigments such as phthalocyanine blue and phthalocyanine green. Quinacridone pigments such as quinacridone red and quinacridone magenta. Perylene pigments such as perylene red and perylene scarlet. Isoindolinone pigments such as isoindolinone yellow and isoindolinone orange. Imidazolone pigments such as benzimidazolone yellow, benzimidazolone orange and benzimidazolone red. Pyranthrone pigments such as pyranthrone red and pyranthrone orange. Indigo pigment. Condensed azo pigment. Thioindigo pigment. Diketopyrrolopyrrole pigment. Flavanthrone yellow, acylamide yellow, quinophthalone yellow, nickel azo yellow, copper azomethine yellow, perinone orange, anthrone orange, dianthraquinonyl red or dioxazine violet. These can be used by appropriately selecting one kind or two or more kinds.

  In addition, when the organic pigment is represented by a color index (CI) number, the following can be used. C. I. Pigment Yellow: 12, 13, 14, 17, 20, 24, 74, 83, 86, 93, 97, 109, 110, 117, and the like. In addition, C.I. I. Pigment Yellow: 120, 125, 128, 137, 138, 147, 148, 150, 151, 153, 154, 166, 168, 180, 185 and the like. C. I. Pigment Orange: 16, 36, 43, 51, 55, 59, 61, 71, etc. C. I. Pigment Red: 9, 48, 49, 52, 53, 57, 97, 122, 123, 149, 168, 175, 176, 177, 180, 192, and the like. C. I. Pigment Red: 215, 216, 217, 220, 223, 224, 226, 227, 228, 238, 240, 254, 255, 272, etc. C. I. Pigment violet: 19, 23, 29, 30, 37, 40, 50, and the like. C. I. Pigment Blue: 15, 15: 1, 15: 3, 15: 4, 15: 6, 22, 60, 64, and the like. C. I. Pigment Green: 7, 36, etc. C. I. Pigment Brown: 23, 25, 26, etc.

  As the dispersant having an anionic group constituting the ink used in the present invention, an anionic surfactant or a polymer dispersant having an anionic group can be used. For example, it is a polymer dispersant having an anionic group, and examples thereof include a styrene-acrylic acid copolymer.

(Pigment having an anionic group)
As the pigment having an anionic group constituting the ink used in the present invention, those having an anionic group bonded to the surface of the pigment particle can be used. Examples of the anionic group include at least one selected from the group consisting of —COOM, —SO ₃ M, and —PO ₃ HM (M in the formula represents a hydrogen atom, an alkali metal, ammonium, or organic ammonium. Represent.) The above-described functional group may be directly bonded to the surface of the pigment particle, or may be chemically bonded through another atomic group. Examples of the other atomic group include an alkylene group having 1 to 12 carbon atoms, a substituted or unsubstituted phenylene group, and a substituted or unsubstituted naphthylene group. Such a self-dispersing carbon black is described in, for example, pamphlet of WO 97/47699. In the present invention, among the above ionic groups, it is particularly preferable to use a pigment in which —COOM is chemically bonded to the surface of the carbon black particle directly or via another atomic group.

  In the ink jet textile printing method of the present invention, the ink of the fabric on which ink jet recording has been performed with the pigment ink is heat-fixed. This will be described below. The temperature at which the ink applied on the fabric is heated and fixed varies depending on the thermoplastic resin used, but is preferably 100 ° C. or higher and 200 ° C. or lower, more specifically about 150 ° C., for example. The heating time is not particularly limited and is preferably, for example, about 1 minute to 10 minutes, more specifically about 3 to 5 minutes. Further, the machine for heating and fixing the ink on the fabric is not particularly limited, and examples thereof include a pin tenter and a universal press.

  In the ink jet textile printing method of the present invention, an image is formed by the ink jet recording method using the above-described pigment ink on the fabric of the present invention described above, and then the ink is heated and fixed to obtain a printed matter. At that time, a desired image is recorded by scanning the recording head of the ink jet recording apparatus on the cloth and applying the ink to a desired position.

  The ink jet recording method and the ink jet recording apparatus may be of any conventionally known recording method. For example, an ink jet recording method and an ink jet recording apparatus that generate ink droplets by applying thermal energy corresponding to a recording signal to ink in a recording head can be used.

Hereinafter, an example of the ink jet recording apparatus will be described. First, FIG. 1 and FIG. 2 show an example of a head configuration which is a main part of an ink jet recording apparatus using thermal energy. FIG. 1 is a cross-sectional view of the head 13 along the ink flow path, and FIG. 2 is a cross-sectional view taken along line AB in FIG. The head 13 is obtained by bonding a heating element substrate 15 and a glass, ceramic, silicon, or plastic plate having a flow path (nozzle) 14 through which ink passes. The heating element substrate 15 is configured by the following (16 to 20). A protective layer 16 formed of silicon oxide, silicon nitride, silicon carbide, or the like. Electrodes 17-1 and 17-2 formed of aluminum, gold, aluminum-copper alloy, or the like. A heating resistor layer 18 formed of a high melting point material such as HfB ₂ , TaN or TaAl. A heat storage layer 19 formed of thermally oxidized silicon or aluminum oxide. A substrate 20 formed of a material having good heat dissipation such as silicon, aluminum, or aluminum nitride.

  Image formation by the recording head 13 having the above-described configuration is performed as follows. First, when a pulsed electric signal is applied to the electrodes 17-1 and 17-2, the region indicated by n of the heating element substrate 15 rapidly generates heat, and bubbles are generated in the ink 21 in contact with the surface. To do. The meniscus 23 protrudes due to the pressure of the bubbles, the ink 21 is ejected through the nozzle 14 of the head 13, becomes an ink droplet 24 from the ejection orifice 22, and flies toward the recording medium 25.

  FIG. 3 is an external view of an example of a multi-head in which a large number of recording heads shown in FIG. 1 are arranged. This multi-head is made by adhering a glass plate 27 having multi-nozzles 26 and a heating head 28 similar to that described in FIG.

  FIG. 4 is a perspective view showing an example of an ink jet recording apparatus incorporating this head. Reference numeral 61 denotes a blade as a wiping member, one end of which is held and fixed by a blade holding member, and forms a cantilever. The blade 61 is disposed at a position adjacent to the recording area by the recording head 65, and in the illustrated example, is held in a form protruding in the moving path of the recording head 65. Reference numeral 62 denotes a cap on the projection port surface of the recording head 65, which is disposed at a home position adjacent to the blade 61, moves in a direction perpendicular to the moving direction of the recording head 65, contacts the ink ejection port surface, and performs capping. The structure to perform is provided. Further, reference numeral 63 denotes an ink absorber provided adjacent to the blade 61 and, like the blade 61, is held in a form protruding in the moving path of the recording head 65. The blade 61, the cap 62, and the ink absorber 63 constitute a discharge recovery unit 64, and the blade 61 and the ink absorber 63 remove moisture, dust, and the like from the discharge port surface.

  Reference numeral 65 denotes a recording head which has discharge energy generating means and performs recording by discharging ink onto a recording medium facing the discharge port surface where the discharge port is arranged. Reference numeral 66 denotes a movement of the recording head 65 by mounting the recording head 65. It is a carriage for performing. The carriage 66 is slidably engaged with the guide shaft 67, and a part of the carriage 66 is connected to a belt 69 (not shown) driven by a motor 68. As a result, the carriage 66 can move along the guide shaft 67, and the recording area and its adjacent area can be moved by the recording head 65.

  51 is a paper feeding section for inserting a recording medium, and 52 is a paper feed roller driven by a motor (not shown). With these configurations, the recording medium is fed to a position facing the ejection port surface of the recording head 65, and discharged to a paper discharge unit provided with a paper discharge roller 53 as recording progresses. In the above configuration, when the recording head 65 finishes recording and returns to the home position, the cap 62 of the ejection recovery unit 64 is retracted from the moving path of the recording head 65, but the blade 61 protrudes into the moving path. As a result, the ejection port of the recording head 65 is wiped.

  When the cap 62 is in contact with the ejection surface of the recording head 65 to perform capping, the cap 62 moves so as to protrude into the moving path of the recording head. When the recording head 65 moves from the home position to the recording start position, the cap 62 and the blade 61 are at the same position as the above-described wiping position. As a result, the ejection port surface of the recording head 65 is wiped even during this movement. The above-described movement of the recording head 65 to the home position is not only at the end of recording or at the recovery of ejection. While the recording head 65 moves in the recording area for recording, the recording head 65 moves to a home position adjacent to the recording area at a predetermined interval. The wiping is performed with this movement.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. The present invention is not limited by the following examples as long as the gist thereof is not exceeded. Unless otherwise specified, “part” means “part by mass”, and “%” means “mass%”.

<Preparation of Fabric for Inkjet Textile Printing of Examples and Comparative Examples>
As the fabric, an A4 size 100% cotton satin fabric (a mercerized product) was used. And this fabric was pretreated by the pad method using the pretreatment liquid described below, and fabrics for inkjet printing of Examples 1 and 2 and Comparative Examples 1 to 4 were produced. Each pretreatment liquid having the composition shown in Table 1 below was used as the pretreatment liquid. Specifically, the cloth was immersed in a pad bath containing the respective pretreatment liquids, the treatment liquid was squeezed with a mangle, and each pretreatment liquid was applied to the cloths by a pad method of drying in a drying process. In all cases, the drawing rate in the mangle was 80%, and the drying conditions in the drying step were 3.5 minutes at a drying temperature of 80 ° C.

<Preparation of pigment ink>
[Ink containing dispersant and pigment having an anionic group]
(Pigment dispersion)
Each pigment listed below was dispersed in water together with a polymer dispersant, and a pigment dispersion of each color containing the dispersant was prepared according to a conventional method. A styrene-acrylic acid copolymer (weight average molecular weight 7,000) was used as the polymer dispersant. The formulation of each pigment dispersion was such that the mixing ratio of pigment / polymer dispersant / water was pigment / polymer dispersant / water = 10/3/87 in terms of mass ratio.

(Type of pigment)
Cyan ink: C.I. I. Pigment Blue 15: 1
-Magenta ink: C.I. I. Pigment Red 122
Yellow ink: C.I. I. Pigment Yellow 74
・ Black ink: Carbon black

(Preparation of pigment ink)
Using the pigment dispersion of each color obtained as described above, a pigment ink of each color was prepared according to the following formulation. The viscosity of the obtained pigment ink of each color was about 3 mPa · s to 5 mPa · s.
-60% by mass of each pigment dispersion prepared above
・ Glycerin 5% by mass
・ Diethylene glycol 10% by mass
・ Isopropyl alcohol 10% by mass
・ Water 15% by mass

[Ink containing a pigment having an anionic group]
(Pigment dispersion)
First, a self-dispersing pigment was prepared by bonding a carboxyl group as an anionic group to the surface of each pigment particle similar to that used in Example 1. Each obtained pigment was dispersed in water according to a conventional method to prepare a pigment dispersion of each color. The formulation of each pigment dispersion was such that the mixing ratio of pigment / water was pigment / water = 10/90 by mass ratio. In each of these pigment dispersions, no dispersant is used.

(Preparation of pigment ink)
A pigment ink was prepared using the pigment dispersion of each color obtained above. The ink formulation was the same as that of the ink containing a dispersant having an anionic group. The viscosity of the obtained pigment ink of each color was about 3 mPa · s to 5 mPa · s.

<Manufacture of printed matter>
Using each of the pigment inks prepared above for each of the inkjet printing fabrics of Examples and Comparative Examples prepared above, a printed material was obtained as follows. First, the two types of pigment inks having different compositions obtained above were each mounted on an ink jet recording apparatus (trade name: BJ F600; manufactured by Canon Inc.), and ink jet recording was performed on each fabric. Immediately thereafter, the printed fabric was heat-fixed with a pin tenter at a drying temperature of 150 ° C. for 3.5 minutes using a pin tenter to produce each printed matter.

<Evaluation>
Each printed matter obtained above was evaluated for the following items. Table 2 summarizes the evaluation results for the printed matter obtained using the ink containing the polymer dispersant and the pigment, and the evaluation results for the printed matter obtained using the ink containing the self-dispersing pigment. Are summarized in Table 3. The occurrence of pretreatment traces before and after the pretreatment for each fabric is shown in Table 2. The lightness L ^* , chromaticity a ^* and b ^* , and color density K / S of the printed material were measured using a colorimeter (trade name: CM-2022; manufactured by Minolta).

1. Optical density The color density K / S of the image forming part of the printed material was measured and evaluated. In addition, it shows that an optical density is so high that the numerical value of color density K / S is large, and it is preferable in this invention.

2. Texture The texture of the printed material was touched by hand and evaluated according to the following criteria.
A: Texture is good B: Texture is slightly poor C: Texture is poor

3. Washing fastness Using a commercial washing machine (ECONOMAT 10D; manufactured by Asahi Seisakusho), an appropriate amount of detergent was added, and the printed matter was washed with warm water at 60 ° C. for 10 minutes, and further rinsed with water for 10 minutes. This washing and rinsing were repeated 10 times. Then, the color density K / S of the printed matter before the washing test was compared with the color density K / S of the printed matter after 10 times of washing, and the reduction rate of the color density K / S after washing was determined. . From the obtained values, the wash fastness of each printed product was evaluated according to the following criteria.
A: Reduction rate of color density K / S is 20% or less B: Reduction rate of color density K / S is greater than 20% and 40% or less C: Reduction rate of color density K / S is greater than 40%

4). Occurrence of pretreatment traces The lightness L ^* , chromaticity a ^* and b ^* of the white fabric before and after the pretreatment were measured. Lightness L satin fabric not pretreated (Blank) ₁ ^*, chromaticity a ₁ ^* and b ₁ ^* and lightness of the fabric of Examples and Comparative Examples obtained by pre-treating the fabric L ₂ ^{* And} chromaticity a ₂ ^* and b ₂ ^* were measured using a colorimeter (trade name: CM-2022; manufactured by Minolta). From the obtained value, the degree of pretreatment trace (ΔE) by the pretreatment agent was calculated using the following formula. Based on the obtained ΔE, the degree of occurrence of pretreatment traces was evaluated according to the following criteria. The evaluation results are shown in Table 1.

(Evaluation criteria)
○: ΔE is 1 or less, and no difference is visually observed. ×: ΔE is larger than 1, and a pretreatment trace is seen.

FIG. 2 is a longitudinal sectional view of a recording head. It is a vertical and horizontal view of a recording head. FIG. 2 is an external perspective view of a recording head in which the recording head shown in FIG. It is a perspective view which shows an example of an inkjet recording device.

Explanation of symbols

13: head 14: nozzle 15: heating element substrate 16: protective layer 17-1, 17-2: electrode 18: heating resistor layer 19: heat storage layer 20: substrate 21: ink 22: ejection orifice (micropore)
23: Meniscus 24: Ink droplet 25: Recording medium 26: Multi nozzle 27: Glass plate 28: Heat generating head 51: Paper feeding unit 52: Paper feed roller 53: Paper discharge roller 61: Blade 62: Cap 63: Ink absorber 64: Ejection recovery unit 65: Recording head 66: Carriage 67: Guide shaft 68: Motor 69: Belt

Claims (6)

An ink-jet printing fabric for use in an ink-jet printing method, to which an ink containing a dispersant and a pigment having an anionic group, or an ink containing a pigment having an anionic group is provided,
A fabric for inkjet printing, wherein the fabric includes a thermoplastic hydrophobic resin having a glass transition temperature of -35 ° C to 45 ° C and a cationic surfactant having a molecular weight of 900 or less.   The inkjet according to claim 1, wherein the fabric is treated with a pretreatment liquid, and a content of the thermoplastic hydrophobic resin in the pretreatment liquid is 0.5 mass% or more and 7 mass% or less. Fabric for textile printing.   The fabric according to claim 1 or 2, wherein the fabric is treated with a pretreatment liquid, and the content of the cationic surfactant in the pretreatment liquid is 0.05 mass% or more and 5 mass% or less. Ink-jet textile fabric.   The inkjet printing fabric according to claim 2 or 3, wherein a mass ratio of the thermoplastic hydrophobic resin and the cationic surfactant in the pretreatment liquid is 140: 1 to 1:10. .   Ink jet recording using an ink containing a dispersant and a pigment having an anionic group or an ink containing a pigment having an anionic group in the fabric for inkjet printing according to any one of claims 1 to 4. An ink jet textile printing method comprising: heat-fixing a fabric ink on which ink jet recording has been performed.   A printed matter produced by the ink-jet printing method according to claim 5.

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