Infrarot-absorbierende Oxyindolizin-Farbstoffe für ein Farbstoff-Donor-Element, das bei der Laser-induzierten thermischen Farbstoffübertragung verwendet wird.

摘要

A dye-donor element for laser-induced thermal dye transfer comprising a support having thereon a dye layer and an infrared-absorbing material which is different from the dye in the dye layer, characterized in that the infrared-absorbing material is an oxyindolizine dye. In a preferred embodiment, the oxyindolizine dye has the following formula: wherein: R<1> and R<2> each independently represents a substituted or unsubstituted alkyl group having from 1 to 6 carbon atoms or an aryl, cycloalkyl or hetaryl group having from 5 to 10 atoms; R<3>, R<4>, R<5>, R<6> and R<7> each independently represents hydrogen, halogen, cyano, alkoxy, aryloxy, acyloxy, aryloxycarbonyl, alkoxycarbonyl, sulfonyl, carbamoyl, acyl, acylamido, alkylamino, arylamino or a substituted or unsubstituted alkyl, aryl or hetaryl group; or any two of said R<3>, R<4>, R<5>, R<6> and R<7> groups may be combined with each other to form a 5- to 7-membered substituted or unsubstituted carbocyclic or heterocyclic ring; Y represents oxygen, sulfur, selenium, tellurium, nitrogen or phosphorus; A and Z each independently represents hydrogen or the atoms necessary to complete a 5- to 7-membered substituted or unsubstituted carbocyclic or heterocyclic ring, with the proviso that Z may be a ring only when Y is nitrogen or phosphorus; n is 0 to 2, with the proviso that n is 1 or 2 when Y is oxygen, sulfur, selenium or tellurium; and X is a monovalent anion.o