Heat transferable material for improved image stability

摘要

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.

主权项

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.