# US 8,784,547 B2 · Lightfast solid ink compositions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,784,547 B2 - Document ID: US8784547B2 - Status: Granted - Kind: B2 - Application number: 13/526,117 - Filed: 2012-06-18 - Published: 2013-12-19 - Granted: 2014-07-22 - Earliest claimed: 2012-06-18 - Assignees: Xerox Corporation - Applicants: Daryl W. Vanbesien; Jennifer L. Belelie; Gabriel Iftime; Corey L. Tracy; Nathan M. Bamsey; Caroline M. Turek; Naveen Chopra; Kentaro Morimitsu - Inventors: Daryl W. Vanbesien; Jennifer L. Belelie; Gabriel Iftime; Corey L. Tracy; Nathan M. Bamsey; Caroline M. Turek; Naveen Chopra; Kentaro Morimitsu - Web page: https://patentgrep.com/patent/US8784547B2 ## CPC - C09D 11/34: Hot-melt inks - C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds - C09D 11/328: characterised by 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 solid ink composition comprising an amorphous component, a crystalline material, and optionally, a colorant, which are suitable for ink jet printing, including printing on coated paper substrates. In embodiments, the solid ink formulation comprises a blend of an amorphous and crystalline components which provides a dye-based solid ink with excellent robustness when forming images or printing on coated paper substrates as well as excellent lightfastness. ## Claims ### Claim 1 A phase change ink comprising: at least a crystalline component selected from the group consisting of an amide, aromatic ester, linear diester, urethanes, sulfones, tartaric acid ester derivatives with aromatic groups and mixtures thereof; at least an amorphous component selected from the group consisting of tartaric acid ester derivatives, citric acid ester derivatives, diurethanes; at least one ultraviolet absorber being a triazole derivative; and a colorant. ### Claim 2 (depends on 1) The phase change ink of claim 1 having a ratio of crystalline to amorphous ratio of from about 60:40 to about 95:5, respectively. ### Claim 3 (depends on 1) The phase change ink of claim 1 having improved lightfastness as exhibited from about 30 to about 100% decrease in CIE delta E 2000 after exposure to light as compared to a phase change ink without the UV absorber. ### Claim 4 (depends on 1) The phase change ink of claim 1, wherein the ultraviolet absorber is selected from the group consisting of 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(2H-Benzotriazole-2-yl)-4-methylphenyl, 2-(2′-Hydroxy-3′,5′-di-tert-amylphenyl)benzotriazole, and mixtures thereof. ### Claim 5 (depends on 1) The phase change ink of claim 1, wherein the ultraviolet absorber is present in an amount of up to about 5%. ### Claim 6 (depends on 5) The phase change ink of claim 5, wherein the ultraviolet absorber is present in an amount of from about 0.01% to about 5%. ### Claim 7 (depends on 1) The phase change ink of claim 1, wherein the ultraviolet absorber is has no color. ### Claim 8 (depends on 1) The phase change ink of claim 1, wherein the ultraviolet absorber has a melting point below a temperature of from about 130° C. to about 140° C. ### Claim 9 (depends on 1) The phase change ink of claim 1 having a viscosity of less than 10 cps at a temperature of about 140° C. ### Claim 10 (depends on 1) The phase change ink of claim 1 having a viscosity of greater than about 106 cps at room temperature. ### Claim 11 (depends on 1) The phase change ink of claim 1 having a melting point of less than 140° C. ### Claim 12 (depends on 1) The phase change ink of claim 1 having a Tcrys of greater than 65° C. ### Claim 13 (depends on 1) The phase change ink of claim 1 exhibiting lightfastness increased by a factor of 2 as compared to a phase change ink without the UV absorber. ### Claim 14 (depends on 1) The phase change ink of claim 1, wherein the colorant is a dye selected from the group consisting of blue dye, black dye, red dye, yellow dye, and mixtures thereof. ### Claim 15 A phase change ink comprising: at least a crystalline component selected from the group consisting of an amide, aromatic ester, linear diester, urethanes, sulfones, tartaric acid ester with aromatic groups and mixtures thereof; at least an amorphous component selected from the group consisting of tartaric acid ester derivatives, citric acid ester derivatives, diurethanes; at least one ultraviolet absorber, wherein the at least one ultraviolet absorber is a triazole derivative; and a dye, wherein the phase change ink exhibits from about 30 to about 100% decrease in CIE delta E 2000 after exposure to light as compared to a phase change ink without the UV absorber. ### Claim 16 (depends on 15) The phase change ink of claim 15, wherein the phase change ink exhibits from about 40 to about 100% decrease in CIE delta E 2000 after exposure to light as compared to a phase change ink without the UV absorber. ### Claim 17 (depends on 15) The phase change ink of claim 15, wherein the ultraviolet absorber is selected from the group consisting of 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(2H-Benzotriazole-2-yl)-4-methylphenyl, 2-(2′-Hydroxy-3′, 5′-di-tert-amylphenyl)benzotriazole, and mixtures thereof. ### Claim 18 (depends on 15) The phase change ink of claim 15, wherein the ultraviolet absorber is present in an amount of up to about 5%. ### Claim 19 A phase change ink comprising: at least a crystalline component selected from the group consisting of an amide, aromatic ester, linear diester, urethanes, sulfones, tartaric acid ester derivatives with aromatic groups and mixtures thereof and having a viscosity of less than 12 cps at a temperature of about 140° C. and a viscosity of greater than 1×106 cps at room temperature; at least an amorphous component selected from the group consisting of tartaric acid ester derivatives, citric acid ester derivatives, diurethanes and having a viscosity of less than 100 cps at a temperature of about 140° C. and a viscosity of greater than 1×106 cps at room temperature; at least one ultraviolet absorber; and a colorant, wherein the phase change ink exhibits from about 30 to about 100% decrease in CIE delta E 2000 after exposure to light as compared to a phase change ink without the UV absorber.