# US 2020/0399490 A1 · Ink for ink jet recording, method for producing ink for ink jet recording, and image recording method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399490 A1 - Document ID: US20200399490A1 - Status: Published application - Kind: A1 - Application number: 17/013,872 - Filed: 2020-09-08 - Published: 2020-12-24 - Earliest claimed: 2018-03-30 - Assignees: FUJIFILM Corporation - Applicants: Fujifilm Corporation - Inventors: Atsushi KAERIYAMA - Web page: https://patentgrep.com/patent/US20200399490A1 ## CPC - C09D 11/322: Pigment inks - B41J 2/01: Ink jet - B41M 5/0023: {Digital printing methods characterised by the inks used (inks per se C09D11/00)} - C09D 11/033: characterised by the solvent - C09D 11/037: characterised by the pigment - C09D 11/107: from unsaturated acids or derivatives thereof - C09D 11/326: characterised by the pigment dispersant - C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes - 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) - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) ## Abstract Provided are an ink for ink jet recording, including a pigment, a water-soluble polymer for dispersing the pigment, an alkali metal salt, and a water-soluble organic solvent, in which a ratio of a content of the water-soluble polymer to a total mass of the alkali metal salt is 15 or less, and a content of the water-soluble organic solvent with respect to a total mass of the ink for ink jet recording is 18% by mass or less; a method for producing an ink for ink jet recording; and an image recording method. ## Claims ### Claim 1 An ink for ink jet recording, comprising: a pigment; a water-soluble polymer for dispersing the pigment; an alkali metal salt; and a water-soluble organic solvent, wherein a ratio of a content of the water-soluble polymer to a total mass of the alkali metal salt is 12 or less, and a content of the water-soluble organic solvent with respect to a total mass of the ink for ink jet recording is 18% by mass or less. ### Claim 2 (depends on 1) The ink for ink jet recording according to claim 1, wherein a content of the water-soluble organic solvent with respect to the total mass of the ink for ink jet recording is 10% by mass or more. ### Claim 3 (depends on 1) The ink for ink jet recording according to claim 1, wherein a content of the pigment with respect to the total mass of the ink for ink jet recording is 2.0% by mass to 7.5% by mass, and a content of the alkali metal salt with respect to the total mass of the ink for ink jet recording is 0.15% by mass to 1.0% by mass. ### Claim 4 (depends on 1) The ink for ink jet recording according to claim 1, wherein a ratio of a content of the pigment to the total mass of the alkali metal salt is 2 to 30. ### Claim 5 (depends on 1) The ink for ink jet recording according to claim 1, wherein the pigment contains at least one selected from the group consisting of carbon black, a perylene-based pigment, and a perinone-based pigment. ### Claim 6 (depends on 1) The ink for ink jet recording according to claim 1, wherein the pigment contains Pigment Orange 43. ### Claim 7 (depends on 1) The ink for ink jet recording according to claim 1, further comprising polymer resin particles. ### Claim 8 (depends on 7) The ink for ink jet recording according to claim 7, wherein a content of the polymer resin particles with respect to the total mass of the ink for ink jet recording is 3.0% by mass to 15.0% by mass. ### Claim 9 (depends on 1) The ink for ink jet recording according to claim 1, wherein the water-soluble polymer contains a constitutional unit represented by Formula 1, in Formula 1, R1 represents a hydrogen atom or a methyl group, L2 represents —C(═O)O—, —OC(═O)—, or —C(═O)NR2—, R2 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R3 represents an alkyl group having 12 or more carbon atoms. ### Claim 10 A method for producing an ink for ink jet recording, the method comprising a step of mixing a pigment, a water-soluble polymer for dispersing the pigment, an alkali metal salt, and a water-soluble organic solvent. ### Claim 11 (depends on 1) An image recording method comprising a step of jetting the ink for ink jet recording according to claim 1 onto a recording medium by an ink jet technique to record an image.