# US 12,215,239 B2 · Ink composition, ink set, 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 12,215,239 B2 - Document ID: US12215239B2 - Status: Granted - Kind: B2 - Application number: 17/148,580 - Filed: 2021-01-14 - Published: 2021-05-06 - Granted: 2025-02-04 - Earliest claimed: 2018-09-14 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Naoko Nishimura; Naotaka Wachi - Web page: https://patentgrep.com/patent/US12215239B2 ## 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)} - C08K 3/22: of metals - C08K 3/36: Silica - C08K 5/053: Polyhydroxylic alcohols - C08K 9/02: Ingredients treated with inorganic substances - C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes - C09D 11/40: Ink-sets specially adapted for multi-colour inkjet printing - C08K 2003/2227: {of aluminium} - C08K 2003/2241: {Titanium dioxide} - C08K 2003/2244: {of zirconium} - C08K 2201/003: Additives being defined by their diameter - 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) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract An ink composition is an ink composition including titanium dioxide particles, metal oxide particles, a dispersant, and water, in which an average particle diameter of the titanium dioxide particles is 100 nm or greater, an average particle diameter of the metal oxide particles is smaller than the average particle diameter of the titanium dioxide particles, and the metal oxide particles are oxide particles of at least one metal selected from the group consisting of zirconium, aluminum, silicon, zinc, and iron. ## Claims ### Claim 1 An ink set, comprising: an ink composition; and a colored ink composition, wherein the ink composition comprises: titanium dioxide particles; metal oxide particles; a first dispersant; and water, wherein an average particle diameter of the titanium dioxide particles is 100 nm or greater, an average particle diameter of the metal oxide particles is smaller than the average particle diameter of the titanium dioxide particles, the metal oxide particles are oxide particles of at least one metal selected from the group consisting of zirconium, aluminum, silicon, zinc, and iron, and an acid value of the first dispersant is 50 mgKOH/g or less; wherein the colored ink composition comprises: a colorant; a second dispersant; and water, wherein an acid value of the second dispersant is greater than 50 mgKOH/g. ### Claim 2 (depends on 1) The ink set according to claim 1, wherein the metal oxide particles are at least one kind of particles selected from the group consisting of zirconium dioxide, aluminum oxide, silicon dioxide, zinc oxide, and diiron trioxide. ### Claim 3 (depends on 1) The ink set according to claim 1, wherein the average particle diameter of the metal oxide particles is in a range of 20 nm to 80 nm. ### Claim 4 (depends on 1) The ink set according to claim 1, wherein a content of the metal oxide particles is in a range of 0.5% by mass to 35% by mass with respect to a content of the titanium dioxide particles. ### Claim 5 (depends on 1) The ink set according to claim 1, wherein the metal oxide particles are at least one kind of particles selected from the group consisting of zirconium dioxide, aluminum oxide, and silicon dioxide. ### Claim 6 (depends on 1) The ink set according to claim 1, wherein the metal oxide particles are zirconium dioxide particles. ### Claim 7 (depends on 1) The ink set according to claim 1, wherein an absolute value of a difference between the average particle diameter of the titanium dioxide particles and the average particle diameter of the metal oxide particles is 50 nm or greater. ### Claim 8 (depends on 1) The ink set according to claim 1, wherein an absolute value of a difference between the average particle diameter of the titanium dioxide particles and the average particle diameter of the metal oxide particles is in a range of 100 nm to 200 nm. ### Claim 9 (depends on 1) The ink set according to claim 1, wherein the average particle diameter of the titanium dioxide particles is 200 nm or greater, and the average particle diameter of the metal oxide particles is 60 nm or less. ### Claim 10 (depends on 1) The ink set according to claim 1, wherein the ink composition further comprises: a water-soluble solvent. ### Claim 11 (depends on 10) The ink set according to claim 10, wherein a content of the water-soluble solvent is in a range of 5% by mass to 40% by mass with respect to a total mass of the ink composition. ### Claim 12 (depends on 10) The ink set according to claim 10, wherein the water-soluble solvent is a glycol-based organic solvent. ### Claim 13 (depends on 6) The ink set according to claim 6, wherein an average particle diameter of the zirconium dioxide particles is 80 nm or less. ### Claim 14 (depends on 6) The ink set according to claim 6, wherein an average particle diameter of the zirconium dioxide particles is in a range of 20 nm to 60 nm. ### Claim 15 (depends on 1) The ink set according to claim 1, wherein the ink set is used for ink jet recording. ### Claim 16 (depends on 1) An image recording method comprising: applying the ink composition in the ink set according to claim 1 onto a base material; and applying the colored ink composition onto the base material. ### Claim 17 (depends on 1) The ink set according to claim 1, wherein the titanium dioxide particles are subjected to a surface treatment such that the particles are having at least one of silicon dioxide and aluminum oxide on each surface thereof.