# US 9,434,198 B2 · Heat transferable material for improved image stability > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,434,198 B2 - Document ID: US9434198B2 - Status: Granted - Kind: B2 - Application number: 13/745,883 - Filed: 2013-01-21 - Published: 2013-05-30 - Granted: 2016-09-06 - Earliest claimed: 2009-03-02 - Assignees: Kodak Alaris Inc. - Applicants: Kodak Alaris Inc. - Inventors: William B. Vreeland; David George Foster - Web page: https://patentgrep.com/patent/US9434198B2 ## CPC - B41M 5/26: Thermography (B41M5/20, B41M5/24 take precedence); {Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used (B23K takes precedence; thermographic or photothermographic systems using noble metal compounds G03C1/494)} - B41M 7/0027: {using protective coatings or layers by lamination or by fusion of the coatings or layers} - B41M 5/38264: {Overprinting of thermal transfer images} - B41M 5/392: Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents - B41M 5/423: {characterised by non-macromolecular compounds, e.g. waxes} - B41M 2205/06: relating to melt (thermal) mass transfer - B41M 2205/30: Thermal donors, e.g. thermal ribbons - B41M 2205/40: Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging - 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) ## Abstract A heat transferable material includes a heat transferable polymeric binder and a light stabilizer that is an N-oxyl radical derived from a hindered amine. The N-oxyl radical has the following formula (A) or formula (B): wherein R1, R2, R5, and R6 are each a straight or branched C1-C6 alkyl or alkene, and R3 and R4 are each independently H, CH2CH3, CH3, OH, OR, COOH, COOR, or NH—C(═O)R, wherein R is a straight or branched C1-C6 alkyl or alkene, and having a molecular weight of 600 or less. At least one of R3 and R4 is not hydrogen. The heat transferable material can be in a section or patch on a thermal donor element to provide a protective overcoat material. A patch in the donor element can include a dye. The heat transferable material provides better image stability and improved iridescence when transferred to a receiver of some type. ## Claims ### Claim 1 A heat transferable donor element comprising a polymeric support, the support having at least one portion thereof coated with a heat transferable material comprising: crosslinked elastomeric organic beads; at least one light stabilizer that is an N-oxyl radical derived from a hindered amine, the N-oxyl radical having the following formula (A) or formula (B): wherein R1, R2, R5, and R6 are each independently selected from a straight or branched C1-C6 alkyl or alkene, R3 and R4 are each independently selected from H, CH2CH3, CH3, OH, OR, COOH, COOR, or NH—C(═O)R, R is a straight or branched C1-C6 alkyl or alkene, at least one of R3 and R4 is not hydrogen, and the N-oxyl radical has a molecular weight of 600 or less; at least one styrene/allyl alcohol copolymer resin; a UV absorbing material; and at least one poly(vinyl acetal) resin having the following Formula I: wherein n is from 10 to 100, the heat transferable material comprising 40% to 90% by weight of the at least one poly(vinyl acetal) resin and 2% to 20% by weight of the UV absorbing material, based on the total dry weight of the heat transferable material. ### Claim 2 (depends on 1) The donor element of claim 1, wherein the donor element further comprises one or more colored dye patches. ### Claim 3 (depends on 1) The donor element of claim 1, wherein R1, R2, R5, and R6 are independently H, CH3, or CH2CH3. ### Claim 4 (depends on 1) The donor element of claim 1, wherein each of R1, R2, R5, and R6 is CH3 or each of R1, R2, R5, and R6 is CH2CH3. ### Claim 5 (depends on 1) The donor element of claim 1, wherein at least one of R3 and R4 is OH, CH2CH3, CH3, or —NH—C(═O)CH3. ### Claim 6 A heat transferable overcoat material comprising: crosslinked elastomeric organic beads; a light stabilizer that is an N-oxyl radical derived from a hindered amine, the N-oxyl radical having the following formula (A) or formula (B): wherein R1, R2, R5, and R6 are each independently selected from a straight or branched C1-C6 alkyl or alkene, R3 and R4 are each independently selected from H, CH2CH3, CH3, OH, OR, COOH, COOR, or NH—C(═O)R, R is a straight or branched C1-C6 alkyl or alkene at least one of R3 and R4 is not hydrogen, and the N-oxyl radical has a molecular weight of 600 or less; at least one styrene/allyl alcohol copolymer resin; a UV absorbing material; and at least one poly(vinyl acetal) resin having the following Formula I: wherein n is from 10 to 100, the heat transferable overcoat material comprising 40% to 90% by weight of the at least one poly(vinyl acetal) resin and 2% to 20% by weight of the UV absorbing material, based on the total dry weight of the heat transferable material. ### Claim 7 (depends on 6) The overcoat material of claim 6, wherein each of R1, R2, R5, and R6 is CH3 or each of R1, R2, R5, and R6 is CH2CH3, and wherein at least one of R3 and R4 is OH, CH2CH3, CH3, or NH—C(═O)CH3. ### Claim 8 (depends on 6) A donor element comprising a polymeric support and the heat transferable overcoat material of claim 6. ### Claim 9 (depends on 8) A method of coating a receiver element with a protective overcoat material, comprising: contacting the donor element of claim 8 with the receiver element; applying heat or pressure sufficient to transfer the heat transferable overcoat material from the donor element to the receiver element. ### Claim 10 (depends on 9) The method of claim 9, wherein the receiver element is selected from the group consisting of an inkjet receiver, a thermal receiver, an electrophotographic receiver, and a silver halide print. ### Claim 11 A thermal transfer assemblage comprising a receiver element in contact with at least a portion of a heat transferable donor element, wherein the donor element comprises a polymeric support, at least one portion thereof coated with a heat transferable overcoat material comprising: crosslinked elastomeric organic beads; a light stabilizer that is an N-oxyl radical derived from a hindered amine, the N-oxyl radical having the following formula (A) or formula (B): wherein R1, R2, R5, and R6 are each independently selected from a straight or branched C1-C6 alkyl or alkene, R3 and R4 are each independently selected from H, CH2CH3, CH3, OH, OR, COOH, COOR, or NH—C(═O)R, R is a straight or branched C1-C6 alkyl or alkene, at least one of R3 and R4 is not hydrogen, and the N-oxyl radical has a molecular weight of 600 or less; at least one styrene/allyl alcohol copolymer resin; a UV absorbing material; and at least one poly(vinyl acetal) resin having the following Formula I: wherein n is from 10 to 100, the heat transferable overcoat material comprising 40% to 90% by weight of the at least one poly(vinyl acetal) resin and 2% to 20% by weight of the UV absorbing material, based on the total dry weight of the heat transferable material. ### Claim 12 (depends on 11) The assemblage of claim 11, wherein the donor element comprises two or more patches, and wherein at least one patch includes a dye and at least one patch includes the heat transferable overcoat material. ### Claim 13 (depends on 11) The assemblage of claim 11, wherein the receiver element is selected from the group consisting of an inkjet receiver, a thermal receiver, an electrophotographic receiver, and a silver halide print. ### Claim 14 (depends on 11) The assemblage of claim 11, wherein each of R1, R2, R5, and R6 is CH3 or each of R1, R2, R5, and R6 is CH2CH3, and wherein at least one of R3 and R4 is OH, CH2CH3, CH3, or NH—(C═O)CH3. ### Claim 15 (depends on 11) The assemblage of claim 11, wherein the receiver element comprises a receiver layer and the receiver layer comprises a plasticizer.