Thermal print element comprising a magenta 3-aryl-2-arylazo-5-aminothiazole or aminothiophene dye stabilized with a cyan indoaniline dye

摘要

A thermal print element comprising a support having thereon a receiving layer containing a thermally-transferred dye image, the dye image comprising a magenta dye having the following formula: wherein:wherein R¹ and R² are each independently hydrogen or a substituted or unsubstituted alkyl, cycloalkyl, or aryl group, or may be joined together to form a 5- or 6-membered, substituted or unsubstituted, heterocyclic ring system;R³ is a substituted or unsubstituted aryl group having from about 6 to 10 carbon atoms;R⁴ represents at least one electron withdrawing group;R⁵ is hydrogen, alkoxycarbonyl, cyano, halogen, carbamoyl, acyl, alkylsulfonyl, arylsulfonyl, sulfamoyl or alkyl, or may represent the atoms necessary to join with R² to form a 5- to 7-membered, substituted or unsubstituted, heterocyclic ring system; the dye image also comprising a cyan indoaniline dye in the same areas as the magenta dye to provide improved stability to light for the magenta dye, the cyan indoaniline dye having the formula: wherein:R⁶ and R⁷ are each independently hydrogen or a substituted or unsubstituted alkyl, cycloalkyl, or aryl group;R⁸ represents hydrogen, a substituted or unsubstituted alkyl group, alkoxy, halogen, -NHCOR¹ or -NHSO₂R¹;R⁹ represents hydrogen or a substituted or unsubstituted alkyl, cycloalkyl, or aryl group, -CONHR⁶, -CN, -Cl, -NHCOR⁶, -NHCO₂R⁶, -NHCONHR⁶ -NHCON(R⁶)₂, -SO₂NHR⁶, -NHSO₂R⁶, -SCN orY represents hydrogen or the atoms necessary to complete a 5- or 6-membered, substituted or unsubstituted, carbocyclic or heterocyclic ring system;n is 1-4; andm is 1-4.