Mixture of dyes for cyan dye donor for thermal color proofing

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

G - Physics

03

F

G03F 3/10 (2006.01) B41M 5/035 (2006.01) B41M 5/26 (2006.01)

Patent

CA 2054448

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: Image wherein: R1 and R2 each independently represents hydrogen; a substituted or unsubstituted alkyl group having from 1 to about 6 carbon atoms; a substituted or unsubstituted cycloalkyl group having from about 5 to about 7 carbon atoms; a substituted or unsubstituted allyl group; or a substituted or unsubstituted aryl or hetaryl group having from about 6 to about 10 carbon atoms; or R1 and R2 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 R1 and R2 together with one or two of R3 represent atoms which can form a 5- to 7-membered heterocyclic ring; each R3 independently represents substituted or unsubstituted alkyl, cycloalkyl, allyl, aryl or hetaryl as described above for R1 and R2; alkoxy, aryloxy, halogen, nitro, cyano, thiocyano, hydroxy, acyloxy, acyl, alkoxycarbonyl, aminocarbonyl, alkoxycarbonyloxy, carbamoyloxy, acylamido, ureido, imido, alkylsulfonyl, arylsulfonyl, alkyl- sulfonamido, arylsulfonamido, alkylthio, arylthio or trifluoromethyl; or atoms at any two adjacent positions of R3 may be combined together to form a 5- or 6-membered carbocyclic or heterocyclic ring; m is an integer of from 0 to 4; R4 represents R5, alkylthio or arylthio, with the proviso that when R4 is alkylthio or arylthio, then m must be at least 1; and R5 represents a substituted or unsubstituted aryl or hetaryl group as described above for R1 and R2; and at least one of the other of the dyes having the formula: I I Image wherein: R1, R2, R3 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 NHCOR6, NHCO2R6, NHCONHR6 or NHSO2R6; and with the further proviso that when X is combined with Y, then J represents CONHR6, SO2NHR6, CN, SO2R6 or SCN; R6 is a substituted or unsubstituted alkyl, cycloalkyl, allyl, aryl or hetaryl group as defined for R1 above; and Y is R1, acylamino or may be combined together with X as described above.

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