Processing solution, set of processing solution and ink, processing solution dispensing device, image forming apparatus, processing solution dispensing method, and image forming method

Abstract

To provide a treatment liquid that achieves a high color development property in an image formed of ink while suppressing deterioration with time of the color development property as well as yellow discoloration.SOLUTION: A treatment liquid imparted to a fabric contains an amino group-containing alcohol and a polyvalent metal salt. A content of the polyvalent metal salt is preferably 5.0 mass% or more and 30.0 mass% or less with respect to the mass of the treatment liquid, and a content of the amino group-containing alcohol is preferably 0.01 mass% or more and 10.0 mass% or less with respect to the mass of the treatment liquid.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a processing solution, a set of processing solution and ink, a processing solution dispensing device, an image forming apparatus, a method for dispensing a processing solution, and an image forming method. [Background technology]

[0002] Inkjet printers have become widely used in homes as digital signal output devices due to their advantage of easily producing on-demand color prints. In recent years, however, inkjet recording methods have become necessary not only for home use but also for slow-penetration media such as coated paper, non-absorbent media such as plastic films, and fabric media such as woven and knitted fabrics, to achieve image quality comparable to conventional analog printing. For example, in the textile printing field, the market size for so-called DTG (Direct to Garment), which involves printing directly onto clothing such as T-shirts, is expanding year by year. Furthermore, with the recent rise of personal recommendation businesses in the apparel industry and the increased activity of collaborations with fine art recognized in the interior textile field, the demand for inkjet recording systems capable of forming images with excellent color reproduction on fabrics is steadily increasing. In inkjet printing, which uses ink containing pigments as colorants to directly create an image on fabric, the printing method differs from screen printing and other conventional printing methods in that it does not require the creation, storage, and cleaning of printing plates, making it suitable for small-batch, high-mix production. It also offers advantages such as shorter lead times because it does not involve processes such as transfer printing, and excellent lightfastness. Inks for this method have been developed.

[0003] In recent years, there has been a growing need for image creation on fabrics containing synthetic fibers such as polyester. Furthermore, there is a growing need for image printing not only on plain fabrics but also on fabrics that have already been colored by printing or other methods. One method for image printing on colored fabrics involves coating the fabric with white ink and then depositing colored ink on top. Even on fabrics colored with dark colors such as black or navy, the layer of white ink acts as a base for the colored ink, allowing for sufficient color development. Therefore, in the above image printing method, it is important that the white ink conceals the dark color of the fabric, and it is required to have a high degree of whiteness.

[0004] Patent Document 1 discloses a printing method using a white pigment inkjet ink composition, in which a processing liquid composition for improving color development contains a cationic compound such as a polyvalent metal salt, an organic acid, or a cationic resin. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] However, when a processing solution is applied to a fabric and ink is applied to the treated area of ​​the fabric, while high color development can be obtained in the image formed by the ink, there is a problem that the color development decreases over time. Furthermore, there is a problem in that it is difficult to achieve this decrease in color development over time without the image yellowing. The present invention aims to provide a processing solution that suppresses the gradual decline in color development and yellowing of an image formed on a fabric using ink, while achieving high color development. [Means for solving the problem]

[0006] The present invention relates to a treatment solution applied to a fabric, characterized in that it contains an amino group-containing alcohol and a polyvalent metal salt. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a treatment liquid that suppresses the deterioration over time of color development and yellowing while obtaining high color development in an image formed by ink on a fabric.

Brief Description of the Drawings

[0008] [Figure 1] FIG. 1 is a schematic diagram showing an example of an image forming apparatus. [Figure 2] FIG. 2 is a schematic diagram showing an example of a treatment liquid storage means.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, an embodiment of the present invention will be described.

[0010] <<Treatment Liquid>> [[ID=二十五]]The treatment liquid of the present disclosure contains an amino group-containing alcohol and a polyvalent metal salt, and preferably contains other components such as water, an organic solvent other than the amino group-containing alcohol (hereinafter also referred to as "other organic solvent"), a resin, and a surfactant as necessary. In the present disclosure, the "treatment liquid" is a liquid composition applied to the area of the fabric where the ink will be applied before the ink is applied to the fabric. Note that the treatment liquid preferably does not contain a colorant for practical use.

[0011] <Amino Group-Containing Alcohol> The treatment liquid contains an amino group-containing alcohol. In the present disclosure, the "amino group-containing alcohol" represents an organic solvent having a primary, secondary, or tertiary amino group and a hydroxyl group in the molecule. By including an amino group-containing alcohol in the treatment liquid, the deterioration over time of color development and yellowing are suppressed in an image formed by ink applied later to the area of the fabric to which the treatment liquid has been applied.

[0012] First, the reason why the deterioration over time of color development and yellowing are suppressed will be explained. The treatment liquid of the present invention is suitable as a treatment liquid for a fabric containing colored fibers. Generally, when applying ink to fabric, a treatment solution is used to enhance the opacity of the ink over the fabric's color. However, when the colorant coloring the fibers comes into contact with components in the treatment solution or ink that have solubility or affinity for the colorant, such as organic solvents, resins, or oily additives, the colorant coloring the fibers transfers to the image formed by the ink. This transfer leads to a problem where the color development of the image deteriorates over time. Furthermore, this problem is more pronounced when using white ink, as even a small amount of the colorant coloring the fibers transferring to the white image formed by the white ink has a significant impact. This problem is also more pronounced when using fabrics containing synthetic fibers such as polyester fibers. This is because the dyeing of synthetic fibers such as polyester fibers is usually done by using disperse dyes as colorants and applying high temperature and high pressure treatment to relax the internal structure of the fibers and push the disperse dye into the fiber matrix. Unlike reactive dyes, which have binding force through reaction, when these disperse dyes come into contact with the components in the treatment solution or ink, the disperse dyes are more likely to transfer to the image. Furthermore, in this problem, when the fabric is heated to dry the processing solution or ink, the internal structure of the fibers relaxes due to the heating, which promotes the transfer of colorants such as disperse dyes that color the fibers to the image, making the effect more pronounced. In addition, in this problem, when the fabric is colored with a dark color such as black, even a small amount of the colorant transferring to the image will have a significant impact, making the effect even more pronounced. One method to suppress the migration of colorants from fabrics containing colored fibers to an image is to pre-treat the fabric with a treatment solution containing polyethyleneimine (see Japanese Patent Publication No. 10-88487). However, this method may result in the image yellowing when the fabric is heated. Furthermore, this problem becomes more pronounced when the subsequently applied ink is white ink, as even a small amount of yellowing has a significant impact on the white image formed by the white ink. To address these challenges, using a treatment solution containing amino group-containing alcohol traps the coloring agent that colors the fibers with the amino group-containing alcohol, preventing the coloring agent from transferring to the image formed by the ink, thus suppressing the deterioration of color development over time. Furthermore, using a treatment solution containing amino group-containing alcohol also suppresses the occurrence of yellowing. The reason for the suppression of yellowing is not entirely clear, but it is presumed to be due to improved heat resistance caused by the hydroxyl groups in the amino group-containing alcohol.

[0013] There are no particular restrictions on the amino group-containing alcohol, and it can be appropriately selected depending on the purpose. Examples include 2-aminoethanol, 2-(dimethylamino)ethanol, 2-(diethylamino)ethanol, diethanolamine, N-butyldiethanolamine, triisopropanolamine, N-(2-aminoethyl)ethanolamine, N-methyldiethanolamine, N,N-dibutylethanolamine, N-methylethanolamine, N-(aminopropyl)ethanolamine, 2-(2-aminoethoxy)ethanol, 2-amino-2-(hydroxymethyl)-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, 1-amino-2-propanol, 3-amino-1-propanol, and the like. Among these, it is preferable that at least one selected from the group consisting of 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, and 3-amino-1-propanol is used, as this further suppresses the decrease in color development over time in images and allows for high color development.

[0014] The content of the amino group-containing alcohol is preferably 0.01% by mass or more and 10.0% by mass or less relative to the mass of the processing solution, and more preferably 0.1% by mass or more and 5.0% by mass or less. A content of 0.01% by mass or more can suppress the deterioration of color development in the image over time. Furthermore, a content of 10.0% by mass or less can suppress yellowing in the image.

[0015] <Polyvalent metal salts> The processing solution contains polyvalent metal salts. The inclusion of polyvalent metal salts in the processing solution allows for high color development in the image formed by ink applied later to areas of the fabric treated with the processing solution. This is because, when the polyvalent metal salts in the processing solution applied to the fabric first come into contact with the colorants in the subsequently applied ink, the electrostatic effect causes aggregates of the colorants to form, separating the colorants from the liquid phase and promoting their fixation to the fabric surface. By including polyvalent metal salts in the processing solution, even when using a medium with large voids like fabric, the colorants can be retained on the fabric surface by forming a layer of aggregates, resulting in a highly colored image. Furthermore, even when using fabrics with low ink absorption, beading can be suppressed, and a high-quality image can be formed. Furthermore, unlike flocculants such as cationic polymers, polyvalent metal salts can suppress the transfer of the processing solution to contact members, even when contact members such as transport members come into contact with the area to which the processing solution has been applied between the time the processing solution is applied to the fabric and the time the ink is applied.

[0016] There are no particular restrictions on the polyvalent metal salts, and they can be appropriately selected according to the purpose. Examples include salts of titanium compounds, chromium compounds, copper compounds, cobalt compounds, strontium compounds, barium compounds, iron compounds, aluminum compounds, calcium compounds, magnesium compounds, zinc compounds, and nickel compounds. These may be used individually or in combination of two or more.

[0017] There are no particular restrictions on the magnesium compound used, and it can be appropriately selected depending on the purpose. Examples include magnesium chloride, magnesium acetate, magnesium sulfate, magnesium nitrate, and magnesium silicate. There are no particular restrictions on the calcium compound used, and it can be appropriately selected depending on the purpose. Examples include calcium carbonate, calcium nitrate, calcium chloride, calcium acetate, calcium sulfate, and calcium silicate. There are no particular restrictions on the barium compound used; it can be appropriately selected depending on the purpose, for example, barium sulfate. There are no particular restrictions on the zinc compound used; it can be appropriately selected depending on the purpose. Examples include zinc sulfide and zinc carbonate. There are no particular restrictions on the aluminum compound used; it can be appropriately selected for the purpose. Examples include aluminum silicate and aluminum hydroxide. Among these, calcium compounds, magnesium compounds, or nickel compounds are preferred because they can effectively aggregate the colorants in the ink, and calcium compounds or magnesium compounds that are alkaline earth metal salts are more preferred. Furthermore, calcium nitrate is particularly preferred because it has high compatibility with amino group-containing alcohols and improves the storage stability of the treatment solution.

[0018] The polyvalent metal salt content is preferably 5.0% by mass or more relative to the mass of the processing solution, more preferably 5.0% by mass or more and 30.0% by mass or less, and even more preferably 10.0% by mass or more and 25.0% by mass or less. When the polyvalent metal salt content is 5.0% by mass or more, the aggregation of colorants in the ink is promoted, and by retaining the colorants on the fabric with large voids, a highly colored image can be obtained. Furthermore, when the polyvalent metal salt content is 30.0% by mass or less, the precipitation and crystallization of polyvalent metal salts in the processing solution can be suppressed.

[0019] <Water> The treatment solution may contain water. There are no particular restrictions on the water content, and it can be appropriately selected depending on the purpose, but from the viewpoint of the drying properties of the treatment solution, it is preferable that the water content be between 10.0% by mass and 90.0% by mass relative to the mass of the treatment solution, and more preferably between 20.0% by mass and 60.0% by mass.

[0020] <Other organic solvents> The processing solution may contain other organic solvents other than amino group-containing alcohols. The type of other organic solvent is not particularly limited and includes, for example, polyhydric alcohols, ethers such as polyhydric alcohol alkyl ethers and polyhydric alcohol aryl ethers, nitrogen-containing heterocyclic compounds, amides, amines, and sulfur-containing compounds. Other specific examples of organic solvents include, for example, ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 3-methyl-1,3-butanediol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 2,4-pentanediol, Polyhydric alcohols such as 1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,3-hexanediol, 2,5-hexanediol, 1,5-hexanediol, glycerin, 1,2,6-hexanetriol, 2-ethyl-1,3-hexanediol, ethyl-1,2,4-butanetriol, 1,2,3-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, petriol, ethylene glycol monoethyl ether, ethylene glycol Examples include polyhydric alcohol alkyl ethers such as monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether; polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether; nitrogen-containing heterocyclic compounds such as 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, ε-caprolactam, and γ-butyrolactone; amides such as formamide, N-methylformamide, N,N-dimethylformamide, 3-methoxy-N,N-dimethylpropionamide, and 3-butoxy-N,N-dimethylpropionamide; amines such as triethylamine; sulfur-containing compounds such as dimethyl sulfoxide, sulfolane, and thiodiethanol; propylene carbonate; and ethylene carbonate.

[0021] There are no particular restrictions on the content of other organic solvents, and they can be appropriately selected depending on the purpose, but it is preferable that they be between 10.0% by mass and 90.0% by mass relative to the mass of the treatment solution.

[0022] <Resin> The processing solution may contain resin. The type of resin is not particularly limited and examples include urethane resin, polyester resin, acrylic resin, vinyl acetate resin, styrene resin, butadiene resin, styrene-butadiene resin, vinyl chloride resin, acrylic styrene resin, and acrylic silicone resin. Resin particles made from these resins may also be used. A treatment solution can be obtained by mixing the resin particles, dispersed in water as a dispersion medium in a resin emulsion, with materials such as organic solvents. The resin particles may be synthesized as appropriate, or commercially available products may be used. Furthermore, these may be used individually or in combination of two or more types of resin particles.

[0023] There are no particular restrictions on the volume-average particle size of the resin particles, and they can be appropriately selected depending on the purpose. The volume-average particle size can be measured, for example, using a particle size analyzer (NanoTrac Wave-UT151, manufactured by MicroTrac-Bell Co., Ltd.).

[0024] There are no particular restrictions on the resin content, and it can be appropriately selected depending on the purpose, but it is preferable that it be 1.0% by mass or more and 30.0% by mass or less relative to the mass of the processing solution.

[0025] <Other ingredients> The treatment solution may also contain other components such as surfactants, defoamers, preservatives and fungicides, rust inhibitors, and pH adjusters.

[0026] - Surfactants - Any of the following surfactants can be used: silicone-based surfactants, fluorine-based surfactants, amphoteric surfactants, nonionic surfactants, and anionic surfactants. There are no particular restrictions on silicone-based surfactants, and they can be selected appropriately depending on the purpose. Among these, those that do not decompose even at high pH are preferred. Examples of silicone-based surfactants include side-chain modified polydimethylsiloxane, both-end modified polydimethylsiloxane, one-end modified polydimethylsiloxane, and both-end modified polydimethylsiloxane. Those having a polyoxyethylene group or a polyoxyethylene polyoxypropylene group as a modifying group are particularly preferred because they exhibit good properties as aqueous surfactants. In addition, polyether-modified silicone-based surfactants can also be used as silicone-based surfactants, for example, compounds in which a polyalkylene oxide structure is introduced into the Si side chain of dimethylsiloxane. As fluorinated surfactants, perfluoroalkyl sulfonic acid compounds, perfluoroalkyl carboxylic acid compounds, perfluoroalkyl phosphate ester compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in their side chains are particularly preferred because they have low foaming properties. Examples of perfluoroalkyl sulfonic acid compounds include perfluoroalkyl sulfonic acid and perfluoroalkyl sulfonate salts. Examples of perfluoroalkyl carboxylic acid compounds include perfluoroalkyl carboxylic acid and perfluoroalkyl carboxylic acid salts. Examples of polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in their side chains include sulfate ester salts of polyoxyalkylene ether polymers having perfluoroalkyl ether groups in their side chains and salts of polyoxyalkylene ether polymers having perfluoroalkyl ether groups in their side chains. Counterions of the salts in these fluorinated surfactants include Li, Na, K, NH4, NH3CH2CH2OH, NH2(CH2CH2OH)2, and NH(CH2CH2O H)3 is one example. Examples of amphoteric surfactants include laurylaminopropionate, lauryldimethylbetaine, stearyldimethylbetaine, and lauryldihydroxyethylbetaine. Examples of nonionic surfactants include polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkylamines, polyoxyethylene alkylamides, polyoxyethylene propylene block polymers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and ethylene oxide adducts of acetylene alcohol. Examples of anionic surfactants include polyoxyethylene alkyl ether acetate, dodecylbenzene sulfonate, lauryl salt, and salts of polyoxyethylene alkyl ether sulfate. These can be used individually or in combination of two or more types.

[0027] There are no particular restrictions on the silicone-based surfactant, and it can be appropriately selected depending on the purpose. Examples include side-chain modified polydimethylsiloxane, both-end modified polydimethylsiloxane, one-end modified polydimethylsiloxane, and both-end modified polydimethylsiloxane. Polyether-modified silicone-based surfactants having a polyoxyethylene group or a polyoxyethylene-polyoxypropylene group as a modifying group are particularly preferred as they exhibit good properties as aqueous surfactants. Such surfactants may be synthesized as appropriate, or commercially available products may be used. Commercially available products include, for example, those from BIC Chemie Inc., Shin-Etsu Chemical Co., Ltd., Toray Dow Corning Silicone Co., Ltd., Nippon Emulsion Co., Ltd., and Kyoeisha Chemical Co., Ltd. There are no particular limitations on the polyether-modified silicone surfactants mentioned above, and they can be appropriately selected depending on the purpose. For example, one example is a polyalkylene oxide structure represented by the general formula (S-1), in which a polyalkylene oxide structure is introduced into the Si side chain of dimethylpolysiloxane. [ka] (However, in general formula (S-1), m, n, a, and b each independently represent integers, R represents an alkylene group, and R' represents an alkyl group.) As the polyether-modified silicone surfactant mentioned above, commercially available products can be used. Examples include KF-618, KF-642, KF-643 (Shin-Etsu Chemical Co., Ltd.), EMALEX-SS-5602, SS-1906EX (Nippon Emulsion Co., Ltd.), FZ-2105, FZ-2118, FZ-2154, FZ-2161, FZ-2162, FZ-2163, FZ-2164 (Toray Dow Corning Silicone Co., Ltd.), BYK-33, BYK-387 (BIC Chemie Co., Ltd.), TSF4440, TSF4452, TSF4453 (Toshiba Silicone Co., Ltd.).

[0028] As for fluorine-based surfactants, compounds with 2 to 16 carbon atoms substituted with fluorine are preferred, and compounds with 4 to 16 carbon atoms substituted with fluorine are more preferred. Examples of fluorinated surfactants include perfluoroalkyl phosphate compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in their side chains. Among these, polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in their side chains are preferred because they have low foaming properties, and fluorinated surfactants represented by general formulas (F-1) and (F-2) are particularly preferred. [ka] In the compound represented by the above general formula (F-1), m is 0 to 1 in order to impart water solubility. An integer of 0 is preferred, and n is preferably an integer between 0 and 40. [ka] In the compound represented by the above general formula (F-2), Y is H or C m F 2m+1 m is an integer from 1 to 6, or CH2CH(OH)CH2-CmF 2m+1 m is an integer between 4 and 6, or CpH 2p+1p is an integer between 1 and 19. n is an integer between 1 and 6. a is an integer between 4 and 14. Commercially available fluorine-based surfactants may be used as described above. Examples of such commercial products include: Surflon S-111, S-112, S-113, S-121, S-131, S-132, S-141, S-145 (all manufactured by Asahi Glass Co., Ltd.); Flurad FC-93, FC-95, FC-98, FC-129, FC-135, FC-170C, FC-430, FC-431 (all manufactured by Sumitomo 3M Limited); Megafac F-470, F-1405, F-474 (all manufactured by Dainippon Ink and Chemicals, Inc.); Zonyl TBS, FSP, FSA, FSN- Examples include the 100, FSN, FSO-100, FSO, FS-300, UR, Capstone FS-30, FS-31, FS-3100, FS-34, FS-35 (all manufactured by Chemors); FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW (all manufactured by Neos Corporation); Polyfox PF-136A, PF-156A, PF-151N, PF-154, PF-159 (manufactured by Omnova); and Unidyne DSN-403N (manufactured by Daikin Industries, Ltd.).

[0029] There are no particular restrictions on the surfactant content, and it can be appropriately selected depending on the purpose, but it is preferable that it be between 0.001% by mass and 5% by mass relative to the mass of the treatment solution.

[0030] -Antifoaming agent- There are no particular restrictions on the defoaming agent; examples include silicone-based defoaming agents, polyether-based defoaming agents, and fatty acid ester-based defoaming agents. These may be used individually or in combination of two or more. Among these, silicone-based defoaming agents are preferred due to their superior foam-breaking effect.

[0031] -Preservative and fungicidal agent- There are no particular restrictions on the preservatives and fungicides used; for example, 1,2-benzisothiazolin-3-one can be used.

[0032] -Rust Inhibitor- There are no particular restrictions on the rust inhibitors used; examples include acidic sulfites and sodium thiosulfate.

[0033] - pH adjuster - As a pH adjusting agent, it can be used without any particular restrictions, as long as it can adjust the pH to 7 or higher.

[0034] <Physical properties of the treatment solution> There are no particular restrictions on the physical properties of the processing liquid, and they can be appropriately selected according to the purpose. For example, it is preferable that the viscosity, surface tension, etc., are within the following ranges. The viscosity of the processing solution at 25°C is preferably 0.5 mPa·s to 30 mPa·s, and more preferably 0.5 mPa·s to 10 mPa·s, in order to obtain good imparting properties. Here, viscosity can be measured using, for example, a rotational viscometer (RE-80L manufactured by Toki Sangyo Co., Ltd.). Measurement conditions are 25°C, standard cone rotor (1°34' × R24), sample volume 1.2 mL, rotation speed 50 rpm, and measurement can be performed in 3 minutes. The surface tension of the treatment solution is preferably 35 mN / m or less, and more preferably 32 mN / m or less, at 25°C, in order to ensure that the treatment solution is adequately leveled on the fabric and shorten the drying time of the treatment solution.

[0035] <<Ink>> As described above, the ink is a liquid composition applied to the area of ​​the fabric to which the processing solution has been applied. Depending on the purpose, the ink may contain other components such as organic solvents, water, colorants, resins, and surfactants. Note that the same components as those used in the processing solution can be used for the organic solvents, water, resins, surfactants, etc., so their explanation is omitted.

[0036] The ink is preferably white ink. When the ink is white ink, even if a small amount of the colorant that colors the fiber migrates to the white image formed by the white ink, the influence becomes significant, and the influence of yellowing also becomes significant. This is because the effect obtained by the treatment liquid of the present disclosure becomes more prominent. In the present disclosure, "white ink" is ink that can form an image of a color called "white" in the common social concept, and includes those that are slightly colored. It also includes inks sold under names such as "white ink", "white ink". Furthermore, for a white fabric made of polyester fiber, when a solid image with an ink adhesion amount of 30 mg / cm 2 is formed, and the lightness (L * ) and chromaticity (a * , b * ) of the solid image are measured using a spectrophotometer (for example, X-rite exact (manufactured by X-rite)), in the range of 60 ≦ L * ≦ 100, -4.5 ≦ a * ≦ 2, -6 ≦ b * ≦ 2.5. In addition, the white ink is preferably used as a base-forming white ink for forming a base for enhancing the color development property of a non-white image formed by a non-white ink further applied on the white image by forming a white image on the fabric. Also, this non-white ink, as described above, contains other components such as organic solvents, water, non-white colorants, resins, and surfactants according to the purpose. In the present disclosure, "non-white ink" represents ink that is not included in the above white ink.

[0037] <Colorant> As the colorant, pigments and dyes can be used. As the pigments, inorganic pigments or organic pigments can be used. These can be used alone or in combination of two or more. Also, mixed crystals can be used.

[0038] Examples of pigments that can be used include black pigment, yellow pigment, magenta pigment, cyan pigment, white pigment, green pigment, orange pigment, and glossy or metallic pigments such as gold and silver. Among these, as mentioned above, it is preferable to use white pigment from the viewpoint that it is possible to create white ink.

[0039] As inorganic pigments, titanium dioxide, iron oxide, tin oxide, zirconium oxide, iron titanate (a composite oxide of iron and titanium), calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, and chromium yellow can be used, as well as carbon black produced by known methods such as the contact method, furnace method, and thermal method. Among these inorganic pigments, titanium dioxide, iron oxide, tin oxide, zirconium oxide, and iron titanate (a composite oxide of iron and titanium) are preferred because they can be used as white pigments, and titanium dioxide is more preferred because it has a high refractive index and can produce high whiteness.

[0040] In addition, organic pigments such as azo pigments, polycyclic pigments (e.g., phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, indigo pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments, etc.), dye chelates (e.g., basic dye type chelates, acid dye type chelates, etc.), nitro pigments, nitroso pigments, and aniline black can be used. Of these pigments, those with good affinity to the solvent are preferably used. Other uses such as resin hollow particles and inorganic hollow particles are also possible.

[0041] Specific examples of pigments include carbon blacks (CI Pigment Black 7) such as furnace black, lamp black, acetylene black, and channel black, or metals such as copper, iron (CI Pigment Black 11), and titanium dioxide, as well as organic pigments such as aniline black (CI Pigment Black 1).

[0042] Furthermore, for color applications, we have CI Pigment Yellow 1, 3, 12, 13, 14, 17, 24, 34, 35, 37, 42 (yellow iron oxide), 53, 55, 74, 81, 83, 95, 97, 98, 100, 101, 104, 108, 109, 110, 117, 120, 138, 150, 153, 155, 180, 185, 213, and CI Pigment Ole. Orange 5, 13, 16, 17, 36, 43, 51, CI Pigment Red 1, 2, 3, 5, 17, 22, 23, 31, 38, 48:2, 48:2 (Permanent Red 2B(Ca)), 48:3, 48:4, 49:1, 52:2, 53:1, 57:1 (Brilliant Carmine 6B), 60:1, 63:1, 63:2, 64:1, 81, 83, 88, 101 (Bengara), 104, 105, 106, 108 (Cadmium Red), 112, 114, 122 (Quinacridone Magenta), 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 184, 185, 190, 193, 202, 207, 208, 209, 213, 219, 224, 254, 264, CI Pigment Violet 1 (Rhodamine Lake), 3, 5:1, 16, 19, 23, 38; CI Pigment Blue 1, 2, 15 (Phthalocyanine Blue), 15:1, 15:2, 15:3, 15:4 (Phthalocyanine Blue), 16, 17:1, 56, 60, 63; CI Pigment Green 1, 4, 7, 8, 10, 17, 18, 36, etc. are available.

[0043] The dyes used are not particularly limited and include acid dyes, direct dyes, reactive dyes, and basic dyes. They may be used individually or in combination of two or more types. As dyes, for example, CI Acid Yellow 17, 23, 42, 44, 79, 142, CI Acid Red 52, 80, 82, 249, 254, 289, CI Acid Blue 9, 45, 249, CI Acid Black 1, 2, 24, 94, CI Food Black 1, 2, CI Direct Yellow 1, 12, 24, 33, 50, 55, 58, 86, 132, 142, 144, Examples include 173, CI Direct Red 1, 4, 9, 80, 81, 225, 227, CI Direct Blue 1, 2, 15, 71, 86, 87, 98, 165, 199, 202, CI Direct Black 19, 38, 51, 71, 154, 168, 171, 195, CI Reactive Red 14, 32, 55, 79, 249, and CI Reactive Black 3, 4, 35.

[0044] The colorant content in the ink is preferably 0.1% to 15.0% by mass relative to the mass of the ink, and more preferably 1.0% to 10.0% by mass, from the viewpoint of improving image density, good fixation, and ejection stability.

[0045] Methods for obtaining ink by dispersing pigments include introducing hydrophilic functional groups into the pigment to create a self-dispersible pigment, coating the surface of the pigment with a resin and dispersing it, and using a dispersant to disperse it. One method for creating self-dispersible pigments by introducing hydrophilic functional groups into pigments is to add functional groups such as sulfone groups or carboxyl groups to a pigment (e.g., carbon) to make it dispersible in water. One method for coating and dispersing pigments with resin is to encapsulate the pigments in microcapsules, making them dispersible in water. This can be rephrased as resin-coated pigments. In this case, it is not necessary for all pigments incorporated into the ink to be coated with resin; uncoated pigments or partially coated pigments may be dispersed in the ink. Methods of dispersion using dispersants include the use of known low-molecular-weight dispersants, such as surfactants, and high-molecular-weight dispersants. Depending on the pigment, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, etc., can be used as dispersants. Takemoto Oil & Fat Co., Ltd.'s RT-100 (nonionic surfactant) and sodium naphthalene sulfonate formalin condensate can also be suitably used as dispersants. Dispersants may be used individually or in combination of two or more.

[0046] <Ink properties> There are no particular restrictions on the physical properties of the ink, and they can be appropriately selected according to the purpose. For example, it is preferable that the viscosity, surface tension, pH, etc., are within the following ranges. The viscosity of the ink at 25°C is preferably between 5 mPa·s and 30 mPa·s, and more preferably between 5 mPa·s and 25 mPa·s, as this improves print density and character quality and ensures good ejection. Here, viscosity can be measured using, for example, a rotational viscometer (RE-80L manufactured by Toki Sangyo Co., Ltd.). Measurement conditions are 25°C, standard cone rotor (1°34' × R24), sample volume of 1.2 mL, rotation speed of 50 rpm, and measurement can be performed in 3 minutes. The surface tension of the ink is preferably 35 mN / m or less, and more preferably 32 mN / m or less, at 25°C, in order to allow the ink to level nicely on the fabric and shorten the ink drying time. From the viewpoint of preventing corrosion of metal components in contact with the ink, the pH of the ink is preferably 7 to 12, and more preferably 8 to 11.

[0047] <<Set of processing solution and ink>> The processing solution and ink described above may be used as a set in combination. Furthermore, as mentioned above, the ink is preferably white. Furthermore, a set of processing solution and ink does not necessarily have to consist of the processing solution and ink existing independently. For example, it is not limited to cases where the processing solution container and the ink container are manufactured and sold as a single unit. For instance, even if the processing solution container and the ink container are manufactured and sold independently, if it is assumed that the processing solution and ink will be used together, or if the use of the processing solution and ink together is substantially encouraged, it will be included as a set of processing solution and ink.

[0048] <<Fabric>> The treatment solution is applied to the fabric. In this disclosure, "fabric" refers to a material made from fibers in the form of a woven fabric, knitted fabric, nonwoven fabric, etc.

[0049] The fibers are preferably organic fibers such as synthetic fibers, semi-synthetic fibers, regenerated fibers, and natural fibers, and synthetic fibers are more preferably used. Examples of synthetic fibers include polyester, polyamide, acrylic, polyolefin, polyvinyl alcohol, polyvinyl chloride, polyurethane, and polyimide. Examples of semi-synthetic fibers include acetate, diacetate, and triacetate. Examples of regenerated fibers include polynosic, rayon, lyocell, and cupro. Examples of natural fibers include cotton, linen, silk, and wool. Among these fibers, it is preferable that the fibers be colored with disperse dyes as described later, with polyester fibers and acetate fibers being more preferable, and polyester fibers being even more preferable.

[0050] Furthermore, the fibers may include a biodegradable polyester composition. The biodegradable polyester composition may contain, for example, a biodegradable aliphatic-aromatic polyester or polylactic acid, and may optionally contain organic or inorganic fillers. Examples of biodegradable aliphatic-aromatic polyesters include polybutylene adipate terephthalate (PBAT), polybutylene succinate terephthalate (PBST), and polybutylene sebacate terephthalate (PBSeT). Examples of organic fillers include natural starch, plasticized starch, modified starch, natural fibers, and wood flour. Examples of inorganic fillers include talc powder, montmorillonite, kaolin, chalk, calcium carbonate, graphite, gypsum, conductive carbon black, calcium chloride, iron oxide, dolomite, silica, wollastonite, titanium dioxide, silicates, mica, glass fibers, and mineral fibers.

[0051] The fibers used in the fabric are colored by retaining colorants such as pigments and dyes inside or on the surface. In this disclosure, "colored fiber" refers to the lightness (L) of the fiber. * When measured using a spectrophotometer (for example, X-rite exact), 60 > L * This represents fibers that meet the range of 50 > L * It is preferable that the fiber meets the range of 40 > L * It is more preferable that the fiber meets the range of 30 > L * It is even more preferable that the fibers satisfy the range of 20 > L * It is particularly preferable that the fibers satisfy the specified range. Note that the measurement of fiber brightness may also be performed on a fabric, which is an aggregate of fibers. Generally, if the brightness of the fabric is within the above range, the brightness of the fibers contained within the fabric will also be within the above range. The coloring agent is not particularly limited, and the same colorants as those contained in the above-mentioned ink can be used, but it is preferably a dye, and more preferably a disperse dye. Dyeing of synthetic fibers such as polyester fibers is usually done by using a disperse dye as a coloring agent and applying high temperature and high pressure treatment to relax the internal structure of the fiber and push the disperse dye into the fiber substrate. Unlike reactive dyes that have binding force due to a reaction, when this disperse dye comes into contact with the components contained in the above-mentioned treatment solution or ink, the disperse dye is more likely to transfer to the image, and the problems of this disclosure become more apparent (in other words, the effects obtained by the treatment solution of this disclosure become more pronounced).

[0052] <<Processing liquid dispensing apparatus, image forming apparatus, processing liquid dispensing method, image forming method>> The processing liquid dispensing device comprises a processing liquid storage means for containing the processing liquid and a processing liquid dispensing means for applying the processing liquid to the fabric, and may have other components as needed. The form of the processing liquid dispensing device is not particularly limited as long as it has a processing liquid storage means and a processing liquid dispensing means, and may be a standalone, independent device, or it may be a device that is incorporated and integrated into an image forming apparatus by being combined with other components (for example, an ink dispensing means). The image forming apparatus includes a processing liquid storage means for containing a processing liquid, a processing liquid application means for applying the processing liquid to a fabric, and an ink application means for applying ink to the area of ​​the fabric to which the processing liquid has been applied, and may have other configurations as needed. In the processing liquid application apparatus and the image forming apparatus, the processing liquid storage means and the processing liquid application means have a common configuration. The method for applying the treatment solution includes a step of applying the treatment solution to the fabric, and may include other steps as needed. The image forming method comprises a processing liquid application step of applying a processing liquid to a fabric, and an ink application step of applying ink to the area of ​​the fabric to which the processing liquid has been applied, and may include other steps as needed. The processing liquid application step has a common configuration in both the processing liquid application method and the image forming method.

[0053] <Processing liquid dispenser, image forming apparatus> The processing liquid dispensing apparatus and the image forming apparatus will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram showing an example of an image forming apparatus. Figure 2 is a schematic diagram showing an example of a processing liquid containment means.

[0054] The image forming apparatus 400 shown in Figure 1 is an image forming apparatus having a serial-type inkjet head. A mechanism unit 420 is provided inside the outer casing 401 of the image forming apparatus 400. The storage sections 411 of the processing liquid storage means 410p for the processing liquid, the white ink storage means 410w for the white ink, the black ink storage means 410k for the black ink, and the cyan ink storage means 410c for the cyan ink are formed from a packaging material such as aluminum laminate film. The storage sections 411 are housed in a storage container case 414 made of plastic, for example. Thus, each storage means 410 is used as a cartridge.

[0055] Meanwhile, a cartridge holder 404 is provided at the back of the opening when the cover 401c of the main body of the device is opened. Each storage means 410 is detachably attached to the cartridge holder 404. As a result, the discharge port 413 of each storage means 410 and the inkjet ejection head 434 are connected via each supply tube 436, and the processing liquid and each ink can be ejected from the inkjet ejection head 434 onto the fabric. In the image forming apparatus 400 shown in Figure 1, the processing solution is applied to the fabric using an inkjet ejection method, but the method of applying the processing solution is not limited to this. For example, it may be applied using a blade coating method, a roll coating method, a spray coating method, etc.

[0056] The image forming apparatus 400 may also have a heating means for drying the processing liquid or liquid such as white ink applied to the fabric. Examples of known heating means include roll heaters, drum heaters, hot air generators, and heat presses.

[0057] <Method for applying processing solution, method for forming an image> In a method for applying a processing solution and an image forming method, examples of methods for applying the processing solution in the processing solution application step include a dispensing method and a coating method.

[0058] There are no particular restrictions on the discharge method, and it can be appropriately selected according to the purpose. Examples include methods using piezoelectric element actuators, methods applying thermal energy, methods using actuators that utilize electrostatic force, and methods using a continuous-jet type charged control head.

[0059] Examples of coating methods include blade coating, gravure coating, gravure offset coating, wire bar coating, bar coating, roll coating, knife coating, air knife coating, comma coating, U-comma coating, AKKU coating, smoothing coating, microgravure coating, reverse roll coating, 4- or 5-roll coating, dip coating, curtain coating, slide coating, and die coating.

[0060] In the processing solution application step, the amount of processing solution applied to the fabric is 10 mg / cm³. 2 More than 50mg / cm 2 The following is preferred: 20 mg / cm³ 2 More than 40mg / cm 2 The following is more preferable: The amount administered is 10 mg / cm³. 2 If the above is achieved, image quality can be improved, and 50 mg / cm² 2 The following conditions can suppress the occurrence of color unevenness caused by the precipitation of solid components in the processing solution.

[0061] The method for applying the processing solution and the method for forming an image preferably include a heating step (also referred to as the first heating step) in which the fabric to which the processing solution has been applied is heated after the processing solution application step. The treatment liquid applied to the fabric is dried during the heating process. The heating temperature in the heating process is preferably 60°C or higher, more preferably 80°C or higher, and even more preferably 100°C or higher. The heating step in the image formation method is performed before the ink application step, which will be described later.

[0062] The image forming method includes an ink application step of applying ink to a region of the fabric to which a processing solution has been applied. The ink application method can be the same as the processing solution application method described above, including an ejection method and a coating method, but an ejection method is preferred, and an inkjet ejection method is preferred.

[0063] The image forming method preferably includes a heating step (also referred to as a second heating step) in which the fabric to which the processing liquid and ink have been applied is heated after the ink application step. The heating step dries the processing liquid and ink applied to the fabric. The heating temperature in the heating step is preferably 60°C or higher, more preferably 80°C or higher, and even more preferably 100°C or higher. [Examples]

[0064] The following describes embodiments of the present invention, but the present invention is not limited in any way to these embodiments.

[0065] <Example of preparation of treatment solution> (Examples 1-15, Comparative Examples 1-3) The treatment solutions for Examples 1-15 and Comparative Examples 1-3 were obtained by mixing and stirring the materials of the formulations shown in Tables 1-2 below. The units of the numerical values ​​for each formulation shown in Tables 1-2 below are "mass%". The resin emulsion content shown in Tables 1-2 below is expressed as solid content. The polyvalent metal salt content shown in Tables 1-2 below is expressed as the amount of polyvalent metal salt including hydration water, and the content in parentheses is expressed as the amount of polyvalent metal salt excluding hydration water.

[0066] Furthermore, the details of each material shown in Tables 1 and 2 below (product name, manufacturer name, etc.) are as follows: -Organic Solvents- • Propylene glycol (manufactured by Kanto Chemical Co., Ltd.) Glycerin (manufactured by Kanto Chemical Co., Ltd.) • Triethylamine (manufactured by Kanto Chemical Co., Ltd.) - Amino group-containing alcohol • 2-amino-2-ethyl-1,3-propanediol (manufactured by Kanto Chemical Co., Ltd.) 2-amino-2-methyl-1-propanol (manufactured by Kanto Chemical Co., Ltd.) 2-amino-2-methyl-1,3-propanediol (manufactured by Kanto Chemical Co., Ltd.) • 3-amino-1-propanol (manufactured by Kanto Chemical Co., Ltd.) -Resin Emulsion- • Sumikaflex 850HQ (manufactured by Sumika Chemtex Co., Ltd., solid content concentration: 45.5% by mass) -Polyvalent metal salts- • Calcium nitrate tetrahydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) Magnesium nitrate hexahydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) Magnesium sulfate hexahydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.)

[0067] <Example of white ink preparation> -Preparation of urethane resin emulsion- In a four-necked flask equipped with a stirrer, reflux condenser, thermometer, and nitrogen inlet, 75 g of polycarbonate polyol (Duranol T5651, manufactured by Asahi Kasei Chemicals) with a number-average molecular weight (Mn) of 1000, 90 g of dicyclohexylmethane diisocyanate (H12MDI), and 200 g of acetone were added and reacted at 75°C for 4 hours to obtain an acetone solution of the urethane prepolymer. This solution was cooled to 40°C, and 450 g of water was gradually added and emulsified and dispersed using a homogenizer. Then, an aqueous solution of 15 g of 2-methyl-1,5-pentanediamine dissolved in 100 g of water was added, and stirring was continued for 1 hour. This was desolvented under reduced pressure at 50°C to obtain a urethane resin emulsion with a non-volatile content of approximately 45% by mass.

[0068] -Preparation of Pigment Dispersion- In a beaker, 37.5 parts of acrylic copolymer (DISPERBYK-2008: manufactured by BYK, solids content: 60% by mass) were dissolved in 100.0 parts of high-purity water. 30.0 parts of titanium dioxide (JR-600A: manufactured by Teika (primary particle size 250 nm, surface treatment: Al)) were added, and the mixture was stirred at 5000 rpm for 30 minutes using an Excel autohomogenizer manufactured by Nippon Seiki Seisakusho until it was dispersed without clumps. The rotation speed was then gradually increased to 10000 rpm for 30 minutes. The resulting titanium dioxide pigment dispersion was treated with water cooling using an ultrasonic homogenizer US-300T (tip φ26) manufactured by Nippon Seiki Seisakusho at 200 μA for 1 hour, and then filtered through a 5 μm membrane filter (cellulose acetate membrane) to obtain a pigment dispersion containing 17.9% by mass of titanium dioxide pigment.

[0069] -Preparation of white ink- After preparing a vehicle by dissolving the materials of the following formulations, excluding the pigment dispersion and urethane resin emulsion, in deionized water, it was mixed with the urethane resin emulsion, then mixed with the pigment dispersion, and filtered through a filter with an average pore size of 0.8 μm to obtain white inks A, B, and C.

[0070] (White ink A) • Pigment dispersion: 45.0% by mass (titanium dioxide pigment 8.06% by mass) • Pigment dispersion: 30.0% by mass • Urethane resin emulsion: 20.0% by mass • 1,3-Butanediol (Tokyo Chemical Industries, Ltd.): 15.0% by mass Glycerin (Kanto Chemical Co., Ltd.): 15.0% by mass • Surfinol 104 (acetylene glycol-based surfactant manufactured by Nisshin Chemical): 0.9% by mass • 2-Amino-2-ethyl-1,3-propanediol (Kanto Chemical Co., Ltd.): 0.5% by mass • Proxel XLII (manufactured by Arch Chemicals Japan): 0.3% by mass • Ion-exchanged water: remaining amount

[0071] (White ink B) • Pigment dispersion: 62.0% by mass (titanium dioxide pigment 11.1% by mass) • Urethane resin emulsion: 13.0% by mass • Ethylene glycol (Tokyo Chemical Industries, Ltd.): 18.0% by mass • BYK-387 (BIG Chemie Co., Ltd.): 0.9% by mass Triethanolamine (Tokyo Chemical Industries, Ltd.): 0.1% by mass • 1,2-Benzothiazolin-3-one (Tokyo Chemical Industries, Ltd.): 0.3% by mass • Ion-exchanged water: remaining amount

[0072] (White ink C) • White pigment dispersion B: 45.0% by mass (titanium dioxide pigment 8.06% by mass) • Urethane resin emulsion: 20.0% by mass Glycerin (manufactured by Kanto Chemical Co., Ltd.): 6.9% by mass • Silica particle dispersion: 4.5% by mass (Silica particles: 1.93% by mass relative to the total ink amount) Triethylene glycol monobutyl ether (manufactured by Tokyo Chemical Industry Co., Ltd.): 2.9% by mass • BYK-387 (manufactured by Big Chemie Co., Ltd.): 0.9% by mass Triethanolamine (manufactured by Tokyo Chemical Industry Co., Ltd.): 0.4% by mass • Ion-exchanged water: remaining amount

[0073] The obtained processing solution and white inks A and B were used to evaluate "color development (whiteness)," "change in color development (whiteness) over time," and "yellowing" as follows. The results are shown in Tables 1 and 2 below.

[0074] [Color development (whiteness)] First, the processing solution and white ink manufactured as described above were filled into an image forming apparatus (Ricoh, Ri6000), and the amount of processing solution adhering to the surface was 30 mg / cm². 2 The amount of white ink adhering to the surface is 30 mg / cm². 2 It was adjusted to be as follows. Then, black polyester fabric (a woven fabric containing polyester fibers colored with black disperse dye, 60>L* The treatment solution was printed onto a black polyester fabric (manufactured by Toms Co., Ltd.) in a solid image pattern at 600 x 600 dpi, and then dried at 130°C for 90 seconds. Furthermore, white ink was printed onto the treated area of ​​the black polyester fabric in a solid image pattern at 600 x 600 dpi, and then dried at 110°C for 10 minutes to obtain an image sample. Next, the brightness (L) of the solid image portion of the obtained image sample was measured using a spectrophotometer (X-rite exact (manufactured by X-Rite Corporation)). * The color was measured, and the color rendering (whiteness) was evaluated based on the following evaluation criteria. (Evaluation Criteria) A:L * 70 or more B:L * 60 or more but less than 70 C:L * less than 60

[0075] [Changes in color development (whiteness) over time] First, an image sample was obtained in the same manner as the evaluation of [color rendering (whiteness)] described above. Next, within 10 minutes of preparing the image sample, the brightness (L) was measured in the solid image area using a spectrophotometer (X-rite exact (manufactured by X-Rite Corporation)). * The color of the color was measured, and then the resulting image sample was left to stand for 30 days in an environment of 25°C and 40RH, and the brightness (L) was measured again in the same manner. * The color of the sample was measured. The percentage change in L value before and after being placed in a constant temperature bath was calculated, and the change in color development (whiteness) over time was evaluated based on the following evaluation criteria. (Evaluation Criteria) A:L * The rate of change is less than 5% B:L * The rate of change is between 5% and less than 10% C:L * The rate of change is 10% or more.

[0076] [Yellowing] First, an image sample was obtained in the same manner as the evaluation of [color rendering (whiteness)] described above. Next, 24 hours after the image sample was prepared, the chromaticity (b) was measured in the solid image portion of the image sample using a spectrophotometer (X-rite exact (manufactured by X-Rite)). * The color of the sample was measured, and the yellowing was evaluated based on the following evaluation criteria. (Evaluation Criteria) A:b * is less than -1 B:b * -1 or greater, less than 1 C:b * is 1 or more

[0077] [Table 1]

[0078] [Table 2]

[0079] Furthermore, "color development (whiteness)", "change in color development (whiteness) over time", and "yellowing" were evaluated in the same manner as in Example 1, except that white ink A was replaced with white ink C. As a result, the evaluation result was A for all evaluation items.

[0080] The present invention relates to the processing solution described in (1) below, but includes the following embodiments (2) to (12). (1) A treatment liquid applied to the fabric, A treatment solution characterized by containing an amino group-containing alcohol and a polyvalent metal salt. (2) The treatment liquid according to (1) above, wherein the content of the polyvalent metal salt is 5.0% by mass or more and 30.0% by mass or less based on the mass of the treatment liquid. (3) The treatment solution according to (1) or (2) above, wherein the content of the amino group-containing alcohol is 0.01% by mass or more and 10.0% by mass or less relative to the mass of the treatment solution. (4) The treatment solution according to any one of (1) to (3) above, wherein the amino group-containing alcohol is at least one selected from the group consisting of 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, and 3-amino-1-propanol. (5) The treatment solution according to any one of (1) to (4) above, wherein the fabric contains polyester fibers or acetate fibers. (6) The fabric is treated with the treatment solution according to any one of (1) to (5) above, which includes the fibers colored with a disperse dye. (7) A set of processing solution and ink characterized by combining the processing solution and ink described in any one of the above items (1) to (6). (8) A set of the processing liquid and ink described in (7) above, wherein the ink has white ink. (9) A processing liquid application device having a processing liquid storage means for storing the processing liquid described in any one of the above items (1) to (6), and a processing liquid application means for applying the processing liquid to the fabric. (10) An image forming apparatus comprising: a processing liquid containing a processing liquid described in any one of the above items (1) to (6); a processing liquid applying means for applying the processing liquid to the fabric; and an ink applying means for applying ink to the area of ​​the fabric to which the processing liquid has been applied. (11) A method for applying a processing solution, comprising a step of applying the processing solution described in any one of the above items (1) to (6) to the fabric. (12) An image forming method comprising: a processing liquid application step of applying the processing liquid described in any one of the above items (1) to (6) to the fabric; and an ink application step of applying ink to the area of ​​the fabric to which the processing liquid has been applied. [Explanation of Symbols]

[0081] 400 Image forming apparatus 401 Exterior of the image forming apparatus 401c Cover of the main unit of the device 404 Cartridge Holder 410p Processing liquid containment means 410W White Ink Storage Method 410k Black Ink Storage 410c Cyan Ink Storage Means 411 Detention Unit 413 Outlet 414 Storage container case 420 Mechanism Department 434 Inkjet ejection head 436 Supply Tube [Prior art documents] [Patent Documents]

[0082] [Patent Document 1] Japanese Patent Publication No. 2019-131919

Claims

1. An ink set for fabrics comprising a processing liquid and an ink, The aforementioned processing liquid is It contains an amino group-containing alcohol and a polyvalent metal salt, The aforementioned amino group-containing alcohol has a primary or secondary amino group and a hydroxyl group in its molecule. The content of the amino group-containing alcohol is 1.0% by mass or more and 10.0% by mass or less relative to the mass of the treatment solution. The content of the polyvalent metal salt is 5.0% by mass or more and 30.0% by mass or less relative to the mass of the treatment solution. The aforementioned ink has white ink. A fabric ink set characterized by the following features.

2. The ink set for fabrics according to claim 1, wherein the amino group-containing alcohol is at least one selected from the group consisting of 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, and 3-amino-1-propanol.

3. The fabric ink set according to claim 1 or 2, wherein the fabric comprises polyester fibers or acetate fibers.

4. The fabric ink set according to any one of claims 1 to 3, wherein the fabric includes fibers colored with disperse dyes.

5. An image forming apparatus comprising: a processing liquid containing means for containing a processing liquid in a fabric ink set according to any one of claims 1 to 4; a processing liquid applying means for applying the processing liquid to the fabric; and an ink applying means for applying ink from the fabric ink set to the region of the fabric to which the processing liquid has been applied.

6. An image forming method comprising: a processing liquid application step of applying a processing liquid from a fabric ink set according to any one of claims 1 to 4 to the fabric; and an ink application step of applying ink from the fabric ink set to the region of the fabric to which the processing liquid has been applied.

Images