Thermal print element comprising a yellow merocyanine dye stabilized with a cyan indoaniline dye

摘要

A thermal print element comprising a support having thereon a layer containing a thermally-transferred dye image, the dye image comprising a yellow merocyanine dye having the formula: ##STR1## wherein: A and B each independently represent --COR, --COOR, --CONHR, --CN, --SO. sub.2 NR.sub.2 ; or A and B may be combined together with the carbon atom to which they are attached to form a conjugated heterocyclic ring system; P PY represents --CR.sub.2 --, --CR═CH--,--O--, --S-- , --Te--, --Se- -, or --NR--;PPZ represents the atoms necessary to complete a 5- or 6-membered substituted or unsubstituted heterocyclic ring; andPPeach R independently represents hydrogen, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group;PPthe dye image also comprising a cyan indoaniline dye in the same areas as the yellow merocyanine dye to provide improved stability to light for the yellow merocyanine dye, the cyan indoaniline dye having the formula: ##STR2## wherein R.sup.1 and R. sup.2 are each independently hydrogen or a substituted or unsubstituted alkyl, cycloalkyl, or aryl group;PPR.sup.3 is hydrogen, a substituted or unsubstituted alkyl group, halogen, --NHCOR.sup.1 or -- NHSO.sub.2 R.sup.1 ; andPPX represents hydrogen or the atoms necessary to complete a 5- or 6-membered, substituted or unsubstituted, carbocyclic or heterocyclic ring system.