Mixture of dyes for cyan dye donor for thermal color proofing.

摘要

A cyan dye-donor element for thermal dye transfer comprising a support having thereon a dye layer comprising a mixture of cyan dyes dispersed in a polymeric binder, at least one of the cyan dyes having the formula: wherein: R<1> and R<2> each independently represents hydrogen; a substituted or unsubstituted alkyl group having from 1 to 6 carbon atoms; a substituted or unsubstituted cycloalkyl group having from 5 to 7 carbon atoms; a substituted or unsubstituted allyl group; or a substituted or unsubstituted aryl or hetaryl group having from 6 to 10 carbon atoms; or R<1> and R<2> represent atoms which can be joined together to form, along with the nitrogen to which they are attached, a 5- to 7-membered heterocyclic ring; or either or both of R<1> and R<2> together with one or two of R<3> represent atoms which can form a 5- to 7-membered heterocyclic ring; each R<3> independently represents substituted or unsubstituted alkyl, cycloalkyl, allyl, aryl or hetaryl as described above for R<1> and R<2>; alkoxy, aryloxy, halogen, nitro, cyano, thiocyano, hydroxy, acyloxy, acyl, alkoxycarbonyl, aminocarbonyl, alkoxycarbonyloxy, carbamoyloxy, acylamido, ureido, imido, alkylsulfonyl, arylsulfonyl, alkylsulfonamido, arylsulfonamido, alkylthio, arylthio or trifluoromethyl; or atoms at any two adjacent positions of R<3> may be combined together to form a 5- or 6-membered carbocyclic or heterocyclic ring; m is an integer of from 0 to 4; R<4> represents R<5>, alkylthio or arylthio, with the proviso that when R<4> is alkylthio or arylthio, then m must be at least 1; and R<5> represents a substituted or unsubstituted aryl or hetaryl group as described above for R<1> and R<2>; and at least one of the other of the dyes has the formula: wherein: R<1>, R<2>, R<3> and m represent the same as above; X represents hydrogen, halogen or may be combined together with Y to represent the atoms necessary to complete a 6-membered aromatic ring, thus forming a fused bicyclic quinoneimine, such as a naphthoquinoneimine; with the proviso that when X is hydrogen, then J represents NHCORF, where RF represents a perfluorinated alkyl or aryl group; and with the further proviso that when X is halogen, then J represents NHCOR<6>, NHCO2R<6>, NHCONHR<6> or NHSO2R<6>; and with the further proviso that when X is combined with Y, then J represents CONHR<6>, SO2NHR<6>, CN, SO2R<6> or SCN; R<6> is a substituted or unsubstituted alkyl, cycloalkyl, allyl, aryl or hetaryl group as defined for R<1> above; and Y is R<1>, acylamino or may be combined together with X as described above.