# US 2018/0022945 A1 · Near infrared absorbing fine particle dispersion liquid and method for producing the same, anti-counterfeit ink composition using near infrared absorbing fine particle dispersion liquid, and anti-counterfeit printed matter using near infrared absorbing fine particles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022945 A1 - Document ID: US20180022945A1 - Status: Published application - Kind: A1 - Application number: 15/546,681 - Filed: 2016-01-27 - Published: 2018-01-25 - 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/US20180022945A1 ## CPC - C09D 11/033: characterised by the solvent - C09D 17/002: {in organic medium (C09D17/003, C09D17/004 take precedence)} - B41M 3/14: Security printing {(securities B42D25/29)} - B42D 25/373: Metallic materials - B42D 25/378: Special inks - B42D 25/382: absorbing or reflecting infrared light - C08K 3/38: Boron-containing compounds - C08K 9/04: Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} - C09D 11/037: characterised by the pigment - C09D 11/06: based on fatty oils - C09D 11/50: Sympathetic, colour changing or similar inks - C09D 17/00: Pigment pastes, e.g. for mixing in paints (artists' paints C09D5/06) - C09D 17/004: {containing an inorganic pigment} - C09K 3/00: Materials not provided for elsewhere - C08K 2003/385: {Binary compounds of nitrogen with boron} - C08K 2201/011: Nanostructured additives - 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) - 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) - B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract Provided are a near infrared absorbing fine particle dispersion liquid having an absorption ability in a near infrared region, a clear contrast, and applicable to offset printing, and a method for producing the same, an anti-counterfeit ink composition using the near infrared absorbing fine particle dispersion liquid and an anti-counterfeit printed matter using near infrared absorbing fine particles. Also provided are a near infrared absorbing fine particle dispersion liquid containing a solvent of one or more kinds selected from vegetable oils or vegetable oil-derived compounds; near infrared absorbing fine particles in an amount of 2 mass % or more and 25 mass % or less, selected from one or more kinds of hexaboride fine particles expressed by a general formula XBa (wherein element X is at least one or more kinds selected from a group consisting of La, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Y, Sm, Eu, Er, Tm, Yb, Lu, Sr, and Ca, satisfying 4.0≦a≦6.2); and a dispersant soluble in the solvent and having a fatty acid in its structure, wherein viscosity is 180 mPa/S or less, and an anti-counterfeit ink composition containing the near infrared absorbing fine particle dispersion liquid. Also provided is an anti-counterfeit printed matter excellent in anti-counterfeit effect due to the printed matter containing the near infrared absorbing fine particles. ## Claims ### Claim 1 A near infrared absorbing fine particle dispersion liquid, containing: a solvent of one or more kinds selected from vegetable oils or vegetable oil-derived compounds; near infrared absorbing fine particles in an amount of 2 mass % or more and 25 mass % or less, containing one or more kinds of hexaboride fine particles expressed by a general formula XBa (wherein element X is at least one or more kinds selected from a group consisting of La, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Y, Sm, Eu, Er, Tm, Yb, Lu, Sr, and Ca, satisfying 4.0≦a≦6.2); and a dispersant soluble in the solvent and having a fatty acid in its structure, wherein viscosity is 180 mPa/S or less. ### 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, 2) The near infrared absorbing fine particle dispersion liquid according to claim 1 or 2, wherein the dispersant has an acid value of 1 mg KOH/g or more. ### Claim 4 (depends on 1, 2, 3) The near infrared absorbing fine particle dispersion liquid according to any one of claims 1 to 3, 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, 2, 3, 4) The near infrared absorbing fine particle dispersion liquid according to any one of claims 1 to 4, wherein a lattice constant of the near infrared absorbing fine particle is 0.4100 nm or more and 0.4160 nm or less. ### Claim 6 (depends on 1, 2, 3, 4, 5) The near infrared absorbing fine particle dispersion liquid according to any one of claims 1 to 5, 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, 2, 3, 4, 5, 6) The near infrared absorbing fine particle dispersion liquid according to any one of claims 1 to 6, wherein the vegetable oil is one or more kinds of vegetable oils selected from drying oil and semidrying oil. ### Claim 8 (depends on 1, 2, 3, 4, 5, 6, 7) The near infrared absorbing fine particle dispersion liquid according to any one of claims 1 to 7, wherein the near infrared absorbing fine particle dispersion liquid further contains a binder. ### Claim 9 (depends on 1, 2, 3, 4, 5, 6, 7, 8) A method for producing the near infrared absorbing fine particle dispersion liquid according to any one of claims 1 to 8, comprising: mixing and dispersing the near infrared absorbing fine particles, the solvent, and the dispersant. ### Claim 10 (depends on 1, 2, 3, 4, 5, 6, 7, 8) An anti-counterfeit ink composition, containing the near infrared absorbing fine particle dispersion liquid of any one of claims 1 to 8. ### Claim 11 (depends on 10) The anti-counterfeit ink composition according to claim 10 further containing a pigment. ### Claim 12 (depends on 11) The anti-counterfeit ink composition, wherein the pigment of claim 11, is an inorganic pigment and is one or more kinds selected from carbon black, white pigment, an extender pigment, a red pigment, a yellow pigment, a green pigment, a blue pigment, a purple pigment, a fluorescent pigment, a temperature indicating pigment, a pearl pigment, and a metal powder pigment. ### Claim 13 (depends on 11) The anti-counterfeit ink composition, wherein the pigment of claim 11, is an organic pigment and is one or more kinds selected from an azo lake pigment, an insoluble azo pigment, a condensed azo pigment, a phthalocyanine pigment, and a condensed polycyclic pigment. ### Claim 14 (depends on 10, 11, 12, 13) The anti-counterfeit ink composition according to any one of claims 10 to 13, containing one or more kinds selected from a plasticizer, an antioxidant, a thickener, and a wax. ### Claim 15 An anti-counterfeit printed matter having a printed pattern on one side or both sides of a base material, containing near infrared absorbing fine particles of one or more kinds of hexaboride fine particles expressed by a general formula XBa (wherein element X is at least one or more kinds selected from a group consisting of La, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Y, Sm, Eu, Er, Tm, Yb, Lu, Sr, and Ca, satisfying 4.0≦a≦6.2), in the printed pattern. ### Claim 16 (depends on 15) An anti-counterfeit printed matter, wherein the printed pattern of claim 15 further contains a pigment. ### Claim 17 (depends on 16) An anti-counterfeit printed matter, wherein the pigment of claim 16 is an inorganic pigment, and is one or more kinds selected from carbon black, white pigment, an extender pigment, a red pigment, a yellow pigment, a green pigment, a blue pigment, a purple pigment, a fluorescent pigment, a temperature indicating pigment, a pearl pigment, and a metal powder pigment. ### Claim 18 (depends on 16) An anti-counterfeit printed matter, wherein the pigment of claim 16 is an organic pigment and is one or more kinds selected from an azo lake pigment, an insoluble azo pigment, a condensed azo pigment, a phthalocyanine pigment, and a condensed polycyclic pigment. ### Claim 19 (depends on 15, 16, 17, 18) The anti-counterfeit printed matter according to any one of claims 15 to 18, wherein a value obtained by dividing an average value of a diffuse reflectance of the anti-counterfeit printed matter in a wavelength range of 800 nm to 1300 nm, by an average value of a diffuse reflectance of a blank not containing near infrared absorbing fine particles in a wavelength range of 800 nm to 1300 nm, is 0.84 or less.