# US 10,370,552 B2 · Near-infrared absorbing fine particle dispersion liquid and method for producing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,552 B2 - Document ID: US10370552B2 - Status: Granted - Kind: B2 - Application number: 15/546,989 - Filed: 2016-01-27 - Published: 2018-01-18 - Granted: 2019-08-06 - Earliest claimed: 2015-01-27 - Assignees: Sumitomo Metal Mining Co., Ltd. - Applicants: Sumitomo Metal Mining Co., Ltd. - Inventors: Mika Okada; Hideaki Fukuyama - Web page: https://patentgrep.com/patent/US10370552B2 ## CPC - C09D 7/61: inorganic - C09D 17/007: {Metal oxide} - C09D 5/32: Radiation-absorbing paints {(protection against X-, gamma- or corpuscular radiation G21F)} - C09D 7/20: Diluents or solvents - C09D 7/63: organic - C09D 7/67: {Particle size smaller than 100 nm} - C09D 7/68: {Particle size between 100-1000 nm} - C09D 17/00: Pigment pastes, e.g. for mixing in paints (artists' paints C09D5/06) - C09K 3/00: Materials not provided for elsewhere - 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) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract Provided is a near infrared absorbing fine particle dispersion liquid, which can be applied to a base material such as an acrylic resin base material having a low solvent resistance, including: a solvent of one or more kinds selected from petroleum-based solvents; near infrared absorbing fine particles of one or more kinds selected from 10 mass % more and 25 mass % or less of a composite tungsten oxide expressed by MxWyOz, and/or a magneli phase expressed by the general formula WyOz; and a dispersant having a fatty acid in its structure and soluble in the solvent, wherein a viscosity is 180 mPa/S or less. ## Claims ### Claim 1 A near infrared absorbing fine particle dispersion liquid, comprising: a solvent of one or more kinds selected from petroleum-based solvents; near infrared absorbing fine particles of one or more kinds selected from 10 mass % more and 25 mass % or less of a composite tungsten oxide expressed by MxWyOz (M is an element of one or more kinds selected from H, He, alkali metal, alkaline earth metal, rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, TI, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, satisfying 0.001≤x/y≤1, and 2.2≤z/y≤3.0), and/or a tungsten oxide having a Magneli phase expressed by a general formula WyOz (W is tungsten, O is oxygen, satisfying 2.45≤z/y≤2.999); and a dispersant having a fatty acid in its structure, and soluble in the solvent, wherein a viscosity is 180 mPa·S or less, the solvent is one or more solvents selected from petroleum-based solvents having an aniline point of 60° C. or more and 95° C. or less and a boiling point of 50° C. or more and 350° C. or less, and the structure of the dispersant has a polylactone structure or a hydroxystearic acid chain. ### Claim 2 (depends on 1) The near infrared absorbing fine particle dispersion liquid according to claim 1, wherein an anchor portion of the dispersant has one or more kinds selected from a secondary amino group, a tertiary amino group, and a quaternary ammonium group. ### Claim 3 (depends on 1) The near infrared absorbing fine particle dispersion liquid according to claim 1, wherein the dispersant has an acid value of 1 mg KOH/g or more. ### Claim 4 (depends on 1) The near infrared absorbing fine particle dispersion liquid according to claim 1, wherein a dispersed particle size of each near infrared absorbing fine particle is 1 nm or more and 200 nm or less. ### Claim 5 (depends on 1) The near infrared absorbing fine particle dispersion liquid according to claim 1, wherein the near infrared ray absorbing fine particles expressed by MxWyOz have a hexagonal crystal structure or composed of a hexagonal crystal structure. ### Claim 6 (depends on 1) The near infrared absorbing fine particle dispersion liquid according to claim 1, wherein a surface of the near infrared absorbing fine particle is coated with a compound of one or more kinds selected from Si, Ti, Al, and Zr. ### Claim 7 (depends on 1) The near infrared absorbing fine particle dispersion liquid according to claim 1, wherein the MxWyOz is CsxWyOz (0.25≤x/y≤0.35, 2.2≤z/y≤3.0), and a lattice constant of the CsxWyOz is 0.74060 nm or more and 0.74082 nm or less on the a-axis, and 0.76106 nm or more and 0.76149 nm or less on the c-axis. ### Claim 8 (depends on 1) The near infrared absorbing fine particle dispersion liquid according to claim 1, wherein the solvent is one or more solvents selected from petroleum-based solvents having an aniline point of 70° C. or more and 95° C. or less and a boiling point of 50° C. or more and 350° C. or less, and an aromatic hydrocarbon content of 5 mass % or less. ### Claim 9 (depends on 1) A method for producing the near infrared absorbing fine particle dispersion liquid according to claim 1, comprising: mixing the near-infrared absorbing fine particles, the solvent and the dispersant; and dispersing the mixture in a wet medium mill. ### Claim 10 (depends on 1) The near infrared absorbing fine particle dispersion liquid according to claim 1, wherein an addition amount of the dispersant is 30 parts by weight or more and 200 parts by weight or less based on 100 parts by weight of the near infrared absorbing fine particles.