Patent ID: 8124562

Claim:
A thermal transfer ink sheet having, as provided on a support, a dye layer containing a thermo-transferable dye in a resin binder, wherein the dye layer contains at least one polyvinyl acetal modified with a compound represented by the following formula [1], and at least one polyvinyl acetal modified with a compound represented by the following formula [2]: wherein R 1 represents a substituted linear alkyl group, a substituted branched alkyl group, or a substituted or unsubstituted cyclic group; R 2 represents a hydrogen atom, a substituted or unsubstituted linear alkyl group, a substituted or unsubstituted branched alkyl group, or a substituted or unsubstituted cyclic group; wherein R 3 represents a linear hydrocarbon group having from 2 to 50 carbon atoms, or a branched hydrocarbon group having from 2 to 50 carbon atoms; R 4 represents a hydrogen atom, a linear hydrocarbon group having from 1 to 8 carbon atoms, or a branched hydrocarbon group having from 1 to 8 carbon atoms.