Thermally transferable fluorescent compounds

摘要

A donor element for use in a thermal transfer process comprising a support having on one side thereof a thermally transferable fluorescent heterocyclic compound dispersed in a polymeric binder, characterized in that said fluorescent compound corresponds to one of the following general formulae (A) and (B): (A) (B) wherein: R1 represents a hydrocarbon group or a substituted hydrocarbon group; R2 represents hydrogen, a hydrocarbon group, a substituted hydrocarbon group, a carboxylic acid group, an ester group, a nitro group, a carbamoyl group, a substituted carbamoyl group, an amino group or a substituted amino group; R3 represents hydrogen, a hydrocarbon group or a substituted hydrocarbon group, a carboxylic acid group, an ester group, a carbamoyl group or a substituted carbamoyl group; R4 represents hydrogen or a hydrocarbon group or a substituted hydrocarbon group; X represents an electronegative substituent with respect to the carbon atom to which it is attached; and Z represents the atoms necessary to close a quinoline nucleus or such a nucleus in substituted form.