Colored dispersion

Abstract

To provide a colored dispersion that allows for uniform coloring of hydrophobic fibers using a non-contact immersion dyeing method with the minimum necessary amount of coloring agent. [Solution] A dispersion containing a water-insoluble colorant, a polymeric dispersant, a nonionic surfactant, and water, wherein the value obtained by X / Y is less than 150, where X is the total mass of the polymeric dispersant and Y is the total mass of the nonionic surfactant in the dispersion.

Description

Technical Field

[0001] The present invention relates to a dispersion liquid capable of uniformly dyeing a fabric without unevenness when applying a minimum necessary amount of a coloring agent such as a dye to the fabric.

Background Art

[0002] The textile industry has become an international issue because of its high environmental impact in terms of energy consumption and short life cycle in manufacturing. Among them, dyeing consumes a large amount of water and is also said to be a cause of water pollution around the world. In the future, serious water shortages are predicted worldwide due to climate change, economic development, urbanization, and population issues, and there is a strong demand for reducing water consumption in dyeing. Conventional dyeing processes mainly use bath immersion methods such as exhaustion or jet dyeing, padding using a roller coating mechanism, etc. An excessive amount of dye is applied to the fabric, and the excessive dye needs to be removed using a large amount of water, generating wastewater. Previously, in printing, since it is plate -less and energy - saving, the spread of printing by inkjet has been progressing. However, even in immersion dyeing for uniformly dyeing the entire fabric, several non - contact immersion - type dyeing devices for applying dyes to the fabric by digital control such as spraying or dispensers have been proposed. Unlike the bath immersion method, such a non - contact immersion method applies the minimum necessary amount of dye for dyeing to the fabric in order to prevent excessive adhesion of the dye. At that time, the dye uniformly penetrates into the fabric and needs to be uniformly dyed after the fixing process. In particular, polyester, which is a hydrophobic dye, has a property that water hardly penetrates, and the dyes used are also disperse dyes that are water - insoluble and exist as particles, so it is assumed that it is difficult to uniformly penetrate into the fiber interior. However, no proposal for a dye solution for the non - contact immersion method has been made yet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] The present invention aims to provide a colored dispersion that can uniformly color hydrophobic fibers using a non-contact immersion dyeing method with the minimum necessary amount of coloring agent.

[0005] This invention has been made in view of the above circumstances, and aims to provide a coloring solution that can uniformly color hydrophobic fibers with the minimum necessary amount of coloring agent when dyeing them using a non-contact immersion dyeing method. [Means for solving the problem]

[0006] The inventors of this invention conducted extensive research to solve the above-mentioned problems and, as a result, discovered that a specific colored dispersion can solve the above-mentioned problems, thus completing the present invention.

[0007] In other words, the present invention relates to the following 1) to 5). 1) A dispersion containing a water-insoluble colorant, a polymeric dispersant, a nonionic surfactant, and water, wherein the value obtained by X / Y is less than 150, where X is the total mass of the polymeric dispersant and Y is the total mass of the nonionic surfactant in the dispersion. 2) The colored dispersion described in 1), wherein the value obtained by the above X / Y is between 0.5 and 100. 3) A colored dispersion set comprising a colored dispersion according to 1) or 2), and at least one other colored dispersion having a different hue from the colored dispersion. 4) A recording medium to which the colored dispersion described in 1) or 2), or the colored dispersion included in the colored dispersion set described in 3), is attached. 5) A coloring method for attaching the colored dispersion described in 1) or 2), or the colored dispersion contained in the colored dispersion set described in 3), to the recording medium. [Effects of the Invention]

[0008] The present invention provides a colored dispersion that allows for uniform coloring of hydrophobic fibers using a non-contact immersion dyeing method with the minimum necessary amount of coloring agent. [Modes for carrying out the invention]

[0009] The present invention will be described in detail below. In this specification, unless otherwise specified, "parts" and "%" in the examples and other descriptions shall all be expressed on a mass basis.

[0010] The above-mentioned colored dispersion is a dispersion containing a water-insoluble colorant, a polymeric dispersant, a nonionic surfactant, and water. If the total mass of the polymeric dispersant in the dispersion is X and the total mass of the nonionic surfactant is Y, the value obtained by X / Y is less than 150. In this specification, the water-insoluble coloring agent may be abbreviated as "coloring agent," and the colored dispersion as "dispersion" or "coloring liquid."

[0011] [Water-insoluble coloring agent] A water-insoluble coloring agent refers to a coloring agent whose solubility in water at 25°C is typically 3 g / L or less, preferably 2 g / L or less, and more preferably 1 g / L or less.

[0012] Examples of water-insoluble colorants include disperse dyes and oil-soluble dyes, and it is preferable to use disperse dyes. Specific examples of water-insoluble colorants include, for example, CI Disperse Yellow 3, 4, 5, 7, 8, 9, 13, 23, 24, 30, 33, 34, 39, 42, 44, 49, 50, 51, 54, 56, 58, 60, 63, 64, 66, 68, 71, 74, 76, 79, 82, 83, 85, 86, 88, 90, 91, 93, 98, 99, 100, 104, 114, 116, 118, 119 , 122, 124, 126, 135, 140, 141, 149, 160, 162, 163, 164, 165, 179, 180, 182, 183, 186, 192, 198, 199, 200, 202, 204, 210, 211, 215, 216, 218, 224, 232, 237; CI Disperse Orange 1, 1:1, 3, 5, 7, 11, 13, 17, 20, 21, 23, 25, 29, 30, 31, 32, 33, 37, 38, 42, 43, 44, 45, 47, 48, 49, 50, 53, 54, 55, 56, 57, 58, 59, 61, 66, 71, 73, 76, 78, 80, 86, 89, 90, 91, 93, 96, 97, 118, 119, 127, 130, 139, 142; CI Disperse Thread 1, 4, 5, 7, 11, 12, 13, 15, 17, 27, 43, 44, 50, 52, 53, 54, 55, 55:1, 56, 58, 59, 60, 65, 70, 72, 73, 74, 75, 76, 78, 81, 82, 86, 88, 90, 91, 92, 93, 96, 103, 105, 106, 107, 108, 110, 111, 113, 117, 118, 121, 122, 126, 127, 128, 131, 132, 134, 135, 137, 143, 145, 146, 151, 152, 153, 154, 157, 158, 159, 164, 167, 167:1, 169, 177, 179, 181, 183, 184, 185, 188, 189, 190, 191, 192, 200, 201, 202, 203, 205, 206, 207, 210, CIDisperse Violet: 1, 4, 8, 11, 17, 23, 26, 27, 28, 29, 31, 33, 35, 36, 38, 40, 43, 46, 48, 50, 51, 52, 56, 57, 59, 61, 63, 69, 77, 97; CI Disperse Green: 9; CI Disperse Brown: 1, 2, 4, 9, 13, 19; CI Disperse Blue 3, 5, 7, 9, 14, 16, 19, 20, 26, 26:1, 27, 35, 43, 44, 54, 55, 56, 58, 60, 62, 64, 64:1, 71, 72, 72:1, 73, 75, 77, 79, 79:1, 82, 83, 87, 91, 93, 94, 95, 96, 102, 106, 108, 112, 113, 115, 118, 120, 122, 125, 128, 130, 131, 139, 141 ,142,143,145,146,148,149,153,154,158,165,165:1,165:2,167,171,173,174,176,181,183,185,186,187,189,197,198,200,201,205,207,211,214,224,225,257,259,266,267,270,281,284,285,287,288,. Examples include 291, 293, 295, 297, 301, 315, 330, 333, 341, 353, 354, 358, 359, 360, 364, 365, 366, 368; CI Disperse Black 1, 3, 10, 24; CI Solvent Yellow 114; CI Solvent Orange 60, 67; CI Solvent Red 146; CI Solvent Blue 36, 63, 83, 105, 111; etc. Among these, CI Disperse Yellow 114, 163, CI Disperse Red 92, 154, 167:1, and CI Disperse Blue 60, 79:1, 165 are preferred.

[0013] The above colorant may be a powdery or massive dry dye, or may be a wet cake or slurry. Further, it may contain a small amount of a dispersant such as a surfactant for the purpose of suppressing particle aggregation during or after the synthesis of the colorant. Commercially available colorants have grades such as for industrial dyeing, resin coloring, ink, toner, inkjet, etc., and the manufacturing methods, purity, particle diameter of the dye, etc. are different from each other. To suppress the cohesiveness after pulverization, it is preferable that the colorant has a smaller particle diameter, and from the viewpoint of the influence on dispersion stability, it is preferable that the amount of impurities and the like is as small as possible.

[0014] In order to adjust the color tone, it is also possible to blend two or more kinds of colorants. For example, an orange-based colorant and a red-based colorant are appropriately blended mainly with a blue-based colorant to adjust the color tone to black. Thus, this can be used as a black-based colorant. Further, for the purpose of finely adjusting the color tone such as blue, orange, red, violet, black, etc. to a preferred color tone, two or more kinds of colorants may be blended.

[0015] In the colored dispersion liquid according to this embodiment, when the colorant is contained in a particulate form, its average particle diameter is preferably 60 to 200 nm. The average particle diameter is the particle diameter calculated by D50 (50% cumulative volume particle diameter), and is measured by the dynamic light scattering method or the laser diffraction light method described in JIS Z8825. Specifically, it can be measured with a particle size distribution meter based on the dynamic light scattering method, for example, Microtrac UPA, NanoTrac Wave-UT151, NanoTrac Wave-EX150 (all manufactured by Microtrac Bell Co., Ltd.); ELSZ-2, DLS-8000 (all manufactured by Otsuka Electronics Co., Ltd.); LB-550 (manufactured by Horiba, Ltd.); etc.

[0016] The content of the water-insoluble dye is preferably 0.1 to 40% by mass, more preferably 0.5 to 30% by mass, based on the total amount of the colored dispersion liquid.

[0017] [Polymer dispersant] As the above-mentioned polymer dispersant, there is no particular limitation as long as it is a polymer having a weight average molecular weight of 2,500 or more that can disperse the above-mentioned water-insoluble colorant. In the specification of the present application, the polymer dispersant may be abbreviated as a dispersant. As the above-mentioned polymer dispersant, known polymer dispersants can be used. Examples of the polymer dispersant include copolymers composed of at least two monomers selected from monomers such as aromatic sulfonic acid formalin condensates, or styrene and its derivatives; aliphatic alcohol esters of α,β-ethylenically unsaturated carboxylic acids; (meth)acrylic acid and its derivatives; maleic acid and its derivatives; itaconic acid and its derivatives; etc., and it is preferable to contain an aromatic sulfonic acid formalin condensate. The polymer dispersant can be obtained as a commercial product or synthesized. As the polymer dispersant used in the above-mentioned dispersion liquid, for example, it is preferably an aromatic sulfonic acid formalin condensate-based dispersant disclosed in JP-A-2024-64920, more preferably an aromatic sulfonic acid formalin condensate-based dispersant containing the compounds represented by formulas (1) to (3) disclosed in JP-A-2024-64920, and even more preferably the dispersant MF described in Preparation Example 2 of JP-A-2024-64920.

[0018] It is also preferable to use other dispersants in combination. Among them, it is preferable to use the above-mentioned aromatic sulfonic acid formalin condensate-based dispersant and the above-mentioned polyoxyethylene phytosterol in combination. When the content mass of the above-mentioned aromatic sulfonic acid formalin condensate-based dispersant in the above-mentioned dispersion liquid is A1 and the content mass of the above-mentioned polyoxyethylene phytosterol is A2, the value obtained by A1 / A2 is preferably 1 or more and 40 or less, and more preferably 5 or more and 30 or less. Polyoxyethylene phytosterol can also be obtained as a commercial product, and examples include Nikkol BPS-30 (manufactured by Nikko Chemicals Co., Ltd.).

[0019] [Nonionic surfactant] Examples of the nonionic surfactants mentioned above include ether-based surfactants such as polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene dodecylphenyl ether, polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, and polyoxyethylene alkyl ether; Examples include ester-based compounds such as polyoxyethylene oleate, polyoxyethylene distearate, sorbitan laurate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, polyoxyethylene monooleate, and polyoxyethylene stearate; acetylene glycol (alcohol)-based compounds such as 2,4,7,9-tetramethyl-5-decine-4,7-diol, 3,6-dimethyl-4-octin-3,6-diol, and 3,5-dimethyl-1-hexyn-3-ol; Surfinol 104, 105, 82, 465, and Olfin STG manufactured by Air Products Japan Co., Ltd.; and polyglycol ether-based compounds (for example, Tergitol 15-S-7 manufactured by SIGMA-ALDRICH). The nonionic surfactant contained in the above dispersion is preferably acetylene glycol (alcohol) based or polyoxyethylene alkyl ether, and is preferably 3 to 20 in HLB value as determined by the Griffin method described later, more preferably 4 to 20, and even more preferably 8 to 20. Examples of the above polyoxyethylene alkyl ether include Emulgen 4085 (polyoxyethylene myristyl ether, HLB value = 18.9), Emulgen 430 (polyoxyethylene oleyl ether, HLB value 16.2), Emulgen 123P (polyoxyethylene lauryl ether, HLB value 16.9), Emulgen 109P (polyoxyethylene lauryl ether, HLB value 13.6), Emulgen 108 (polyoxyethylene lauryl ether, HLB value 12.1), Emulgen 104P (polyoxyethylene lauryl ether, HLB value 9.7), all manufactured by Kao Corporation. Furthermore, the above-mentioned acetylene glycol (alcohol) system includes EO-modified systems having an ethylene oxide skeleton in the molecule and non-EO-modified systems not having an ethylene oxide skeleton in the molecule, but non-EO-modified systems not having an ethylene oxide skeleton in the molecule are preferred, and Surfinol 104 is even more preferred. Furthermore, if the coloring solution contains the acetylene glycol (alcohol) system and the polyoxyethylene alkyl ether, and the mass of the acetylene glycol (alcohol) system is B1 and the mass of the polyoxyethylene alkyl ether is B2, then the value obtained by B2 / B1 is preferably 0.1 or more and 1500 or less, and more preferably 1 or more and 1000 or less. [HLB value using the Griffin method] The HLB value obtained by the Griffin method is calculated from the formula weight and molecular weight of the surfactant in the ethylene oxide phase using the following formula (1). A smaller HLB value indicates higher lipophilicity of the surfactant, while a larger HLB value indicates higher hydrophilicity of the surfactant. HLB value = 20 × sum of molecular weights of hydrophilic parts / molecular weight Equation (1)

[0020] [water] The water used is preferably water with a low content of impurities such as metal ions, i.e., ion-exchanged water, distilled water, etc. Such water can be prepared by known methods. The water content in each ink is preferably 60% to 99.9% by mass, more preferably 80% to 99.9% by mass, and even more preferably 90% to 99.9% by mass.

[0021] The above-mentioned colored dispersion is a dispersion containing a water-insoluble colorant, a polymeric dispersant, a nonionic surfactant, and water. When the total mass of the polymeric dispersant in the dispersion is X and the total mass of the nonionic surfactant is Y, the value obtained by X / Y is less than 150, and preferably the value obtained by X / Y is 0.5 or more and 100 or less, and more preferably 0.5 or more and 80 or less. Note that the value obtained by X / Y above should be rounded to two decimal places.

[0022] The above-mentioned coloring solution may also contain adjusting agents in addition to the above-mentioned components. Examples of adjusting agents include organic solvents, resins, viscosity modifiers, surfactants, preservatives, fungicides, pH adjusters, chelating agents, rust inhibitors, water-soluble ultraviolet absorbers, antioxidants, and defoaming agents.

[0023] [Organic solvents] Examples of organic solvents include C1-C6 alkanols having one hydroxyl group, such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, tertiary butanol, 3-methoxy-3-methyl-1-butanol, and 3-methoxy-1-butanol; amides such as N,N-dimethylformamide and N,N-dimethylacetamide; lactams such as 2-pyrrolidone, N-methyl-2-pyrrolidone, and N-methylpyrrolidine-2-one; cyclic ureas such as 1,3-dimethylimidazolidine-2-one and 1,3-dimethylhexahydropyrimido-2-one; ketones or keto alcohols such as acetone, 2-methyl-2-hydroxypentan-4-one, and ethylene carbonate; and tetrahydro Examples include cyclic ethers such as furan and dioxane; 1,2-(C2-C3) alkanediols such as ethylene glycol, propylene glycol, and 1,3-propanediol; oligos or polyalkylene glycols or thioglycols having C2-C4 alkylene units, such as diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, polyethylene glycol or polypropylene glycol with a molecular weight of 400 or more, thiodiglycol or dithiodiglycol; polyols (triols) such as glycerin, diglycerin, hexane-1,2,6-triol, and trimethylolpropane; γ-butyrolactone, and dimethyl sulfoxide, glycol ethers, and C4-C12 alkanediols. The above organic solvents contained in the coloring solution may be used individually or in combination of two or more.

[0024] [resin] The above resins are not particularly limited, but examples include one or more selected from condensation polymers such as polyurethane and polyester; and vinyl polymers such as (meth)acrylic resins, styrene resins, acrylic-styrene resins, butadiene resins, styrene-butadiene resins, vinyl chloride resins, vinyl acetate resins, and acrylic silicone resins.

[0025] The above-mentioned coloring solution may contain a viscosity modifier. The viscosity modifier is not particularly limited as long as it is a substance capable of adjusting the viscosity of the ink; known substances can be used.

[0026] The above coloring solution may contain a surfactant. The surfactant is not particularly limited to those described above as "nonionic surfactants," but examples include anionic, cationic, silicone, and fluorine-based surfactants.

[0027] Examples of anionic surfactants include alkyl sulfocarboxylates, α-olefin sulfonates, polyoxyethylene alkyl ether acetates, polyoxyethylene alkyl ether sulfates, N-acyl amino acids or their salts, N-acyl methyl taurates, alkyl sulfates, polyoxyalkyl ether sulfates, alkyl sulfates, polyoxyethylene alkyl ether phosphates, rosinic acid soaps, castor oil sulfates, lauryl alcohol sulfates, alkylphenol type phosphates, alkyl type phosphates, alkylaryl sulfonates, diethyl sulfosaturates, diethylhexyl sulfosaturates, and dioctyl sulfosaturates.

[0028] Examples of cationic surfactants include 2-vinylpyridine derivatives and poly-4-vinylpyridine derivatives.

[0029] Examples of silicone-based surfactants include polyether-modified siloxanes and polyether-modified polydimethylsiloxanes. Examples include Dynol 960 and 980 from Air Products Corporation; Silface SAG001, SAG002, SAG003, SAG005, SAG503A, SAG008, SAG009, and SAG010 from Nisshin Chemical Co., Ltd.; and BYK-345, 347, 348, 349, 3450, 3451, and 3455 from BYK Additives & Instruments; and TEGO Twin 4000, TEGO Wet KL 245, 250, 260, 265, 270, and 280 from Evonic Tego Chemie.

[0030] Examples of fluorinated surfactants include 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. Specific examples of commercially available products include Capstone FS-30 and FS-31 (manufactured by Chemours).

[0031] Examples of the above-mentioned preservatives include compounds such as organosulfur, organonitrogen-sulfur, organohalogen, haloarylsulfone, iodopropagyl, haloalkylthio, nitrile, pyridine, 8-oxyquinoline, benzothiazole, isothiazolin, dithiol, pyridine oxide, nitropropane, organotin, phenol, quaternary ammonium salt, triazine, thiazine, anilide, adamantane, dithiocarbamate, brominated indanone, benzylbromacetate, and inorganic salts. Specific examples of commercially available preservatives include Proxel GXL(S) and XL-2(S) manufactured by Arcsarda.

[0032] Examples of the above-mentioned antifungal agents include sodium dehydroacetate, sodium benzoate, sodium pyridinethion-1-oxide, p-hydroxybenzoate ethyl ester, and 1,2-benzisothiazolin-3-one and their salts, with 1,2-benzisothiazolin-3-one and its salts being preferred.

[0033] Examples of the pH adjusting agents mentioned above include diethanolamine, triethanolamine, N-methyldiethanolamine, 2-methyl-2-amino-1-propanol; alkali metal hydroxides such as lithium hydroxide, sodium hydroxide, and potassium hydroxide; ammonium hydroxide (ammonia water); or alkali metal carbonates such as lithium carbonate, sodium carbonate, sodium bicarbonate, and potassium carbonate; alkali metal salts of organic acids such as sodium silicate and potassium acetate; and inorganic bases such as disodium phosphate.

[0034] Examples of the chelating agents mentioned above include disodium ethylenediaminetetraacetate, sodium nitrilotriacetate, sodium hydroxyethylethylenediaminetriacetate, sodium diethylenetriaminepentaacetate, sodium uracil diacetate, α-cyclodextrin, β-cyclodextrin, and γ-cyclodextrin.

[0035] Examples of the above-mentioned rust inhibitors include acidic sulfites, sodium thiosulfate, ammonium thioglycolate, diisopropylammonium nitride, pentaerythritol tetranitrate, and dicyclohexylammonium nitride.

[0036] Examples of the above-mentioned water-soluble ultraviolet absorbers include, for example, sulfonated benzophenone compounds, benzotriazol compounds, salicylic acid compounds, cinnamic acid compounds, and triazine compounds.

[0037] Examples of the above antioxidants include, for example, various organic and metal complex-based colorfastness inhibitors. Examples of the above organic colorfastness inhibitors include hydroquinones, alkoxyphenols, dialkoxyphenols, phenols, anilines, amines, indanes, chromans, alkoxyanilines, ascorbic acid, isoascorbic acid, chlorogenic acid, sulfur dioxide, catechins, dibutylhydroxytoluene, tocopherol, and butylhydroxyanisole.

[0038] The above-mentioned defoaming agents include acetylene-based defoaming agents such as Surfinol DF110D, Surfinol AD01, Surfinol MD-20, Surfinol DF-58, BYK-017, BYK-018, BYK-019, BYK-021, BYK-022, BYK-023, BYK-024, BYK-025, BYK-028, BYK-044, BYK-092, BYK-1610, BYK-1611, BYK-1615, BYK-1617, and BYK-165. Examples include silicone-based defoamers such as BYK-0, BYK-1679, BYK-1719, BYK-1723, BYK-1724, BYK-1730, BYK-1770, BYK-1781, BYK-1786, and BYK-1789; mineral oil-based defoamers such as BYK-035, BYK-037, BYK-038, and BYK-1630; higher alcohol derivatives such as Bisfoam CS, Bisfoam ECC, and Bisfoam TDI-1; and fatty acid derivatives such as Bisfoam TS-10.

[0039] When preparing the above-mentioned colored solution, known manufacturing methods can be used. For example, one such method involves mixing a water-insoluble colorant, a polymeric dispersant, a nonionic surfactant, and water, with preservatives or other adjusting agents as needed.

[0040] The above-mentioned coloring solution can be prepared using conventionally known equipment, such as a ball mill, sand mill, attritor, basket mill, or roll mill. During preparation, it is preferable to remove coarse particles using a membrane filter or mesh filter.

[0041] Furthermore, it is preferable to microfilter the above-mentioned coloring liquid. When microfiltration is performed, a membrane filter and / or glass filter paper can be used. The pore size of the filter used for microfiltration is usually 0.5 μm to 20 μm, preferably 0.5 μm to 10 μm.

[0042] The present invention also includes a colored dispersion set comprising the above-mentioned colored dispersion and at least one other colored dispersion with a different hue from the above-mentioned colored dispersion; a recording medium to which the above-mentioned colored dispersion or the colored dispersion contained in the colored dispersion set is attached; and a coloring method for attaching the above-mentioned colored dispersion or the colored dispersion contained in the colored dispersion set to the recording medium.

[0043] <Recording media> Recording media to which the above-mentioned coloring liquid, or each of the coloring liquids constituting the above-mentioned coloring liquid set, are attached are also included in the present invention. The recording media is not particularly limited as long as it is a material to which the above-mentioned coloring liquid can adhere, and examples include paper, film, can, leather, fabric, fibers, etc., with fabric, particularly polyester fabric, being preferred.

[0044] Regarding all of the above, combinations of preferred elements are more preferable, and combinations of preferred elements are even more preferable. The same applies to combinations of preferred elements and preferred elements, and combinations of preferred elements and even more preferable elements. Furthermore, unless otherwise specified, all of the above-mentioned components can be used individually or in combination of two or more elements.

[0045] The coloring solution of the present invention exhibits excellent uniformity, substrate penetration, and drying properties. Furthermore, colored materials obtained using the coloring solution of the present invention exhibit excellent friction fastness, wash fastness, and color development. [Examples]

[0046] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. In the examples, unless otherwise specified, "parts" means parts by mass and "%" means mass percent.

[0047] The present invention will be described in detail below with reference to examples. The present invention is not limited to the following examples. The "water" used in the examples is "ion-exchanged water". Note that both the dispersion and the coloring solution are included in the above-mentioned coloring dispersion.

[0048] [Example]: Preparation of dispersions 1-8 Each component listed in the table below was mixed with 0.2 mm diameter glass beads and dispersed in a sand mill under water cooling for approximately 15 hours. The resulting liquid was filtered through glass fiber filter paper GC-50 (manufactured by ADVAN TEC) to obtain dispersions with a colorant content of 15% in each case. The obtained dispersions were designated as dispersion 1 to 8.

[0049] [Table 1]

[0050] In Table 1 above, each abbreviation represents the following: Dispersant MF: Aromatic sulfonic acid formalin condensate-based dispersant as described in Preparation Example 2 of Japanese Patent Application Publication No. 2024-64920 (manufactured by Anyang Double Circle Auxiliary CO., LTD) BPS-30: Nikkol BPS-30 (Ethylene oxide addition of phytosterols) (Manufactured by Nikko Chemicals Co., Ltd.) Proxel GXL(S): Antiseptic and antifungal agent (manufactured by Arcsarda) SF104PG50: Surfinol 104PG50 (manufactured by Air Products Japan). A product made by diluting acetylenediol-based surfactant with propylene glycol. Active ingredient content: 50%.

[0051] [Example]: Preparation of coloring solution The dispersions 1-8 obtained in Examples 1-8 were mixed with the components listed in Tables 2 and 3 below, and stirred for 30 minutes to obtain colored solutions 1-12. In the tables below, the values ​​for each component indicate the amount added.

[0052] [Table 2]

[0053] [Table 3]

[0054] All nonionic surfactants used in the table are manufactured by Kao Corporation. Emulgen 4085 (Polyoxyethylene myristyl ether HLB 18.9) Emulgen 430 (Polyoxyethylene oleyl ether HLB 16.2) Emulgen 123P (Polyoxyethylene Lauryl Ether HLB 16.9) Emulgen 109P (Polyoxyethylene Lauryl Ether HLB 13.6) Emulgen 108 (Polyoxyethylene Lauryl Ether HLB 12.1) Emulgen 104P (Polyoxyethylene Lauryl Ether HLB 9.7)

[0055] [Evaluation of substrate penetration] To prevent contact with anything, the polyester fabric (Tropical, manufactured by Teijin Limited) was fixed to a metal frame with uniform tension in both the vertical and horizontal directions. 50 μL of each coloring solution prepared in the example was taken using a micropipette and dropped onto the fabric from 1 cm above the surface. The fabric was immediately placed in a constant temperature bath and dried at 70°C for 1 minute. The shape of the coloring solution droplet marks on the fabric after drying was visually confirmed. From the standpoint of coloring performance, it is desirable for the droplet marks of the coloring solution to spread uniformly in a circular shape. Judgment criteria: A: It is spread out evenly in a circular shape. B: The center is circular, but the outer edge is jagged. C is an irregular shape and jagged overall. [Evaluation of uniformity of staining] The fabric, treated with the coloring solution in the same manner as the substrate penetration evaluation, was placed in a constant temperature bath and fixed at 200°C for 10 minutes. The removed fabric was then subjected to a reducing wash at 80°C for 10 minutes in a bath containing 6 parts of 45% NaOH aqueous solution, 6 parts of Hydrosaffite, 3 parts of Sanmol RC-700 (anionic surfactant, manufactured by Nikka Chemical Co., Ltd.) and water to a total volume of 3000 parts. After rinsing with water and drying, the uniformity of the coloring solution applied to the fabric was visually confirmed. From the standpoint of colorability, it is desirable that the fabric is uniformly dyed throughout by the coloring solution. Judgment criteria: A: The entire thing is dyed uniformly. B: There are some uneven dyeing areas near the outer edge. C: There are uneven dyeing throughout.

[0056] [Table 4]

[0057] [Table 5]

[0058] Tables 4 and 5 above show the compositions of coloring solutions 1 to 12 prepared in Examples 9 to 20, and the evaluation results of substrate penetration and uniform dyeing properties. As is clear from the results in Tables 4 and 5 above, the coloring solutions of the examples demonstrated excellent performance in substrate penetration and uniform dyeing. [Industrial applicability]

[0059] To provide a colored dispersion that allows for uniform coloring of hydrophobic fibers using a non-contact immersion dyeing method with the minimum necessary amount of coloring agent.

Claims

1. A dispersion containing a water-insoluble colorant, a polymeric dispersant, a nonionic surfactant, and water, wherein the value obtained by X / Y is less than 150, where X is the total mass of the polymeric dispersant and Y is the total mass of the nonionic surfactant in the dispersion.

2. The colored dispersion according to claim 1, wherein the value obtained by the above X / Y is 0.5 or more and 100 or less.

3. A colored dispersion set comprising a colored dispersion according to claim 1 or 2, and at least one other colored dispersion having a different hue from the colored dispersion.

4. A recording medium to which the colored dispersion according to claim 1 or 2 is attached.

5. A method for coloring a recording medium by adhering the colored dispersion according to claim 1 or 2 to the recording medium.

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