# US 11,898,044 B2 · Ink composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,044 B2 - Document ID: US11898044B2 - Status: Granted - Kind: B2 - Application number: 18/032,427 - Filed: 2021-10-29 - Published: 2023-11-30 - Granted: 2024-02-13 - Earliest claimed: 2020-10-30 - Assignees: Dnp Fine Chemicals Co., Ltd. - Applicants: Dnp Fine Chemicals Co., Ltd. - Inventors: Yukiko Ishima; Fumie Yamazaki; Ryosuke Kotani; Ryoma Yasui - Web page: https://patentgrep.com/patent/US11898044B2 ## CPC - C09D 11/322: Pigment inks - C09D 11/037: characterised by the pigment - C09D 11/101: Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing - 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) ## Abstract An active energy ray curable ink composition capable of improving curability while maintaining excellent metal-tone glossiness and a printed matter having high design properties and excellent metal-tone glossiness. The ink composition is discharged using an inkjet method, and contains a polymerization initiator, a polymerizable compound, and a brilliant pigment. The polymerization initiator contains an acylphosphine oxide-based polymerization initiator, aminoacetophenone-based polymerization initiator, and thioxanthone-based polymerization initiator. The printed matter includes a brilliant layer containing the brilliant pigment. ## Claims ### Claim 1 An active energy ray curable ink composition to be discharged by an inkjet method, the ink composition comprising: polymerization initiators, a polymerizable compound, and a brilliant pigment, a content of the brilliant pigment being 1.5 mass % or more with respect to the total amount of the ink composition, a content of the polymerization initiators being 10 mass % or more with respect to the total amount of the ink composition, the polymerization initiators comprising an acylphosphine oxide-based polymerization initiator, and an aminoacetophenone-based polymerization initiator, and a thioxanthone-based polymerization initiator. ### Claim 2 (depends on 1) The ink composition according to claim 1, wherein a content of the acylphosphine oxide-based polymerization initiator is 10 mass % or more and 80 mass % or less with respect to the total amount of the polymerization initiators, a content of the aminoacetophenone-based polymerization initiator is 5 mass % or more and 50 mass % or less with respect to the total amount of the polymerization initiators, and a content of the thioxanthone-based polymerization initiator is 5 mass % or more and 50 mass % or less with respect to the total amount of the polymerization initiators. ### Claim 3 (depends on 2) The ink composition according to claim 2, wherein the content of the acylphosphine oxide-based polymerization initiator is 10 mass % or more and 39 mass % or less with respect to the total amount of the polymerization initiators. ### Claim 4 (depends on 1) The ink composition according to claim 1, wherein the brilliant pigment includes a metal-containing brilliant pigment. ### Claim 5 A recording method, comprising discharging an active energy ray curable ink composition by an inkjet method, the ink composition comprising polymerization initiators, a polymerizable compound, and a brilliant pigment, a content of the brilliant pigment being 1.5 mass % or more, a content of the polymerization initiators being 10 mass % or more with respect to the total amount of the ink composition, and the polymerization initiators comprising an acylphosphine oxide-based polymerization initiator, an aminoacetophenone-based polymerization initiator, and a thioxanthone-based polymerization initiator. ### Claim 6 A manufacturing method of a printed matter, comprising discharging an active energy ray curable ink composition by an inkjet method, the ink composition comprising polymerization initiators, a polymerizable compound, and a brilliant pigment, a content of the brilliant pigment being 1.5% or more, a content of the polymerization initiators being 10 mass % or more with respect to the total amount of the ink composition, the polymerization initiators comprising an acylphosphine oxide-based polymerization initiator, an aminoacetophenone-based polymerization initiator, and a thioxanthone-based polymerization initiator. ### Claim 7 A printed matter comprising a brilliant layer containing a brilliant pigment, wherein when incident light is incident on the brilliant layer at an incidence angle of with respect to the brilliant layer of the printed matter, L1, a total of L* values regarding a reflection angle of −15° and a reflection angle of 15° in the L*a*b* color system, is 200 or more, L2, a total of L* values regarding a reflection angle of 45°, a reflection angle of 75°, and a reflection angle of 110° in the L*a*b* color system, is 100 or more, and L1−L2 is 90 or more, provided that an angle of specular reflection light in response to the incident light and an angle of a normal line with respect to the brilliant layer are defined as 0° and 45°, respectively. ### Claim 8 An active energy ray curable ink composition to be discharged by an inkjet method, the ink composition comprising: a polymerizable compound and a brilliant pigment, a content of the brilliant pigment being 1.0 mass % or more with respect to the total amount of the ink composition, and the ink composition having a contact angle of 29.5° or more and 70.0° or less on a wet film of the ink composition. ### Claim 9 (depends on 8) The ink composition according to claim 8, wherein the brilliant pigment comprises a metal-containing brilliant pigment. ### Claim 10 (depends on 9) The ink composition according to claim 9, wherein the metal-containing brilliant pigment has a volume-based 50% cumulative particle diameter (D50) of 0.01 μm or more and 3.0 μm or less, the metal-containing brilliant pigment has a volume-based 90% cumulative particle diameter (D90) of 4.5 μm or less, and the metal-containing brilliant pigment has a thickness of 10 nm or more and 1.0 μm or less. ### Claim 11 (depends on 8) A recording method, comprising discharging the ink composition according to claim 8 by an inkjet method. ### Claim 12 (depends on 8) A manufacturing method of a printed matter, comprising discharging the ink composition according to claim 8 by an inkjet method. ### Claim 13 (depends on 2) The ink composition according to claim 2, wherein the brilliant pigment includes a metal-containing brilliant pigment. ### Claim 14 (depends on 9) A recording method, comprising discharging the ink composition according to claim 9 by an inkjet method. ### Claim 15 (depends on 9) A manufacturing method of a printed matter, comprising discharging the ink composition according to claim 9 by an inkjet method. ### Claim 16 (depends on 3) The ink composition according to claim 3, wherein the brilliant pigment includes a metal-containing brilliant pigment. ### Claim 17 (depends on 10) A recording method, comprising discharging the ink composition according to claim 10 by an inkjet method. ### Claim 18 (depends on 10) A manufacturing method of a printed matter, comprising discharging the ink composition according to claim 10 by an inkjet method.