# US 9,752,033 B2 · Production method for fine organic pigment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,033 B2 - Document ID: US9752033B2 - Status: Granted - Kind: B2 - Application number: 14/891,192 - Filed: 2014-05-14 - Published: 2016-03-31 - Granted: 2017-09-05 - Earliest claimed: 2013-05-14 - Assignees: Kao Corporation - Applicants: Kao Corporation - Inventors: Takahiro Sato; Hironobu Fukuroi; Hirotaka Takeno - Web page: https://patentgrep.com/patent/US9752033B2 ## CPC - C09B 67/0022: {Wet grinding of pigments} - C09B 67/0002: {Grinding; Milling with solid grinding or milling assistants} - C09B 67/006: {Preparation of organic pigments} - C09B 67/0066: {Aqueous dispersions of pigments containing only dispersing agents} - C09B 67/009: {polymeric dispersing agent} - C09D 11/00: Inks - C09D 11/322: Pigment inks - C09D 17/00: Pigment pastes, e.g. for mixing in paints (artists' paints C09D5/06) - C09D 17/003: {containing an organic pigment (process features in the making of dye stuff preparations C09B67/00)} - G03F 7/0007: {Filters, e.g. additive colour filters; Components for display devices} - C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G) ## Abstract The present invention provides a process for producing a fine organic pigment having a very small primary particle size, and a fine organic pigment produced by the process; a process for producing a dispersion using the fine organic pigment, and a dispersion produced by the process; and a process for producing an ink using the dispersion. The present invention relates to [1] a process for producing a fine organic pigment, including step 1 of kneading a mixture prepared by blending a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and water with each other, the water being blended in an amount of not less than 0.6 part by mass and not more than 4.0 parts by mass on the basis of 100 parts by mass of the water-soluble inorganic salt; [2] a fine organic pigment produced by the process described in the above [1]; [3] a dispersion produced using the fine organic pigment described in the above [2]; [4] a process for producing a paste of a fine organic pigment, including step 2 of cleaning the kneaded mixture obtained in the step 1; [5] a process for producing a dispersion, including step 3 of subjecting the paste of the fine organic pigment produced by the process described in the above [4], an organic solvent and water to dispersing treatment; and [6] a process for producing an ink, including step 4 of mixing the dispersion produced by the process described in the above [5], with at least one material selected from the group consisting of water and an organic solvent. ## Claims ### Claim 1 A process for producing a fine organic pigment, comprising step 1 of kneading a mixture prepared by blending a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and water with each other, the water being blended in an amount of not less than 0.6 part by mass and not more than 4.0 parts by mass on the basis of 100 parts by mass of the water-soluble inorganic salt. ### Claim 2 (depends on 1) The process according to claim 1, wherein the water is blended in an amount of not less than 1.1 parts by mass on the basis of 100 parts by mass of the water-soluble inorganic salt. ### Claim 3 (depends on 1) The process according to claim 1, wherein the water is blended in an amount of not less than 2.5 parts by mass and not more than 16 parts by mass on the basis of 100 parts by mass of the water-soluble organic solvent. ### Claim 4 (depends on 1) The process according to claim 1, wherein the water is blended in an amount of not less than 3.0 parts by mass and not more than 20 parts by mass on the basis of 100 parts by mass of the raw material organic pigment. ### Claim 5 (depends on 1) The process according to claim 1, wherein the water is blended in an amount of not less than 0.4 part by mass and not more than 2.8 parts by mass on the basis of 100 parts by mass of a total amount of the raw material organic pigment, the water-soluble inorganic salt and the water-soluble organic solvent. ### Claim 6 (depends on 1) The process according to claim 1, wherein the kneading step 1 comprises the following steps 1-1 and 1-2: step 1-1: mixing the raw material organic pigment, the water-soluble inorganic salt and the water-soluble organic solvent with each other; and step 1-2: kneading a mixture prepared by blending the mixture obtained in the step 1-1 and the water. ### Claim 7 (depends on 1) The process according to claim 1, wherein the water-soluble inorganic salt is at least one compound selected from the group consisting of an alkali metal chloride and an alkali metal sulfate. ### Claim 8 (depends on 1) The process according to claim 1, wherein the water-soluble organic solvent is an aliphatic compound comprising not less than 1 and not more than 3 alcoholic hydroxyl groups. ### Claim 9 A process for producing a dispersion, comprising the following steps 1 and 1.1 step 1: kneading a mixture prepared by blending a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and water with each other, the water being blended in an amount of not less than 0.6 part by mass and not more than 4.0 parts by mass on the basis of 100 parts by mass of the water soluble inorganic salt; and step 1.1: dispersing the fine organic pigment obtained in the step 1 and a solvent. ### Claim 10 A process for producing an ink, comprising the following steps 1 and 1.1 step 1: kneading a mixture prepared by blending a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and water with each other, the water being blended in an amount of not less than 0.6 part by mass and not more than 4.0 parts by mass on the basis of 100 parts by mass of the water soluble inorganic salt; and step 1.1: dispersing the fine organic pigment obtained in the step 1 and a solvent. ### Claim 11 A process for producing a paste of a fine organic pigment, comprising the following steps 1 and 2: step 1: kneading a mixture prepared by blending a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and water with each other, the water being blended in an amount of not less than 0.6 part by mass and not more than 4.0 parts by mass on the basis of 100 parts by mass of the water-soluble inorganic salt; and step 2: cleaning the kneaded mixture obtained in the step 1. ### Claim 12 (depends on 11) The process for producing a paste of a fine organic pigment according to claim 11, further comprising the following step: kneading the kneaded mixture obtained in the step 1, with a polymer, wherein the step 2 is a step of cleaning the kneaded mixture obtained from kneading the mixture obtained in the step 1, with a polymer. ### Claim 13 (depends on 11) A process for producing a dispersion, comprising the following step: subjecting the paste of the fine organic pigment produced by the process according to claim 11, an organic solvent and water to dispersing treatment. ### Claim 14 (depends on 13) A process for producing an ink, comprising the following step: mixing the dispersion produced by the process according to claim 13 with at least one material selected from the group consisting of water and an organic solvent.