# US 2022/0033672 A1 · White Ink Composition And Ink Jet Recording Method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0033672 A1 - Document ID: US20220033672A1 - Status: Published application - Kind: A1 - Application number: 17/386,868 - Filed: 2021-07-28 - Published: 2022-02-03 - Earliest claimed: 2020-07-29 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Kohei ISHIDA - Web page: https://patentgrep.com/patent/US20220033672A1 ## CPC - C09D 11/54: Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink - C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds - C09D 11/322: Pigment inks - C09D 11/36: based on non-aqueous solvents - 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 A white ink composition is an aqueous ink jet ink and is used for recording on a low-absorbing recording medium or a non-absorbing recording medium, the white ink composition includes a white pigment; and a fixing resin, and the fixing resin contains a urethane resin having a THF soluble component in a two-hour dissolution time of 90 percent by mass or more and a glass transition temperature of 20° C. to 50° C. ## Claims ### Claim 1 A white ink composition which is an aqueous ink jet ink and which is used for recording on a low-absorbing recording medium or a non-absorbing recording medium, the white ink composition comprising: a white pigment; and a fixing resin, wherein the fixing resin contains a urethane resin having a THF soluble component in a two-hour dissolution time of 90 percent by mass or more and a glass transition temperature of 20° C. to 50° C. ### Claim 2 (depends on 1) The white ink composition according to claim 1, wherein the urethane resin has a THF soluble component in a 15-minute dissolution time of 40 percent by mass or more. ### Claim 3 (depends on 1) The white ink composition according to claim 1, wherein a content of the urethane resin with respect to the total mass of the white ink composition is 1.0 to 15 percent by mass. ### Claim 4 (depends on 1) The white ink composition according to claim 1, wherein a content of the white pigment with respect to the total mass of the white ink composition is 5.0 to 20 percent by mass. ### Claim 5 (depends on 1) The white ink composition according to claim 1, wherein the urethane resin is resin particles. ### Claim 6 (depends on 1) The white ink composition according to claim 1, wherein the urethane resin has an acid value of 40 to 100 mgKOH/g. ### Claim 7 (depends on 1) The white ink composition according to claim 1, further comprising a nitrogen-containing organic solvent. ### Claim 8 (depends on 1) The white ink composition according to claim 1, further comprising a glycol ether-based organic solvent having 8 carbon atoms or less. ### Claim 9 (depends on 1) The white ink composition according to claim 1, wherein the white ink composition is used for recording on a recording medium formed of a polyolefin resin. ### Claim 10 (depends on 1) The white ink composition according to claim 1, wherein the white ink composition forms a recorded matter having a recording surface by the recording, and the recording surface is processed by a laminate treatment. ### Claim 11 (depends on 1) The white ink composition according to claim 1, wherein the urethane resin has an alicyclic structure or an aromatic ring structure. ### Claim 12 (depends on 1) An ink jet recording method comprising: a white ink adhesion step of ejecting the white ink composition according to claim 1 by an ink jet method so as to be adhered to a low-absorbing recording medium or a non-absorbing recording medium. ### Claim 13 (depends on 12) The ink jet recording method according to claim 12, further comprising a non-white ink adhesion step of ejecting by an ink jet method, a non-white ink composition which is an aqueous ink jet ink containing a non-white colorant so as to be adhered to the low-absorbing recording medium or the non-absorbing recording medium, wherein the white ink composition and the non-white ink composition are overlapped and adhered to the low-absorbing recording medium or the non-absorbing recording medium. ### Claim 14 (depends on 13) The ink jet recording method according to claim 13, wherein on the low-absorbing recording medium or the non-absorbing recording medium, the non-white ink composition forms a non-white ink layer, and the white ink composition forms a white ink layer on the non-white ink layer.