Patent ID: 7312012

Claim:
A thermal donor comprising a dye mixture and a urea light-stabilizing compound for stabilizing at least one dye, wherein said urea light-stabilizing compound is represented by the following structure I: wherein: R 1 , R 2 and R 3 independently represent a hydrogen atom, alkyl group, cycloalkyl group, alkenyl group, aralkyl group, aryl group or heterocyclic group, provided that at least one of R 1 , R 2 , and/or R 3 is a hydrogen atom and wherein R 3 may form a heterocyclic ring with either R 4 or R 8 ; R 4 -R 8 independently represent a hydrogen atom, hydroxyl group, alkyl group, cycloalkyl group, alkenyl group, aralkyl group, aryl group, heterocyclic group, aryloxy group, or alkoxy group; and wherein at least one of R 4 -R 8 is an alkoxy group.