Thermosensitive recording material.

摘要

A thermosensitive recording material providing a high storage durability for colored images, and a satisfactory whiteness, comprises a thermosensitive colored image-forming layer formed on a sheet substrate and comprising a colorless dye precursor, and a new color developing agent which comprises an aromatic sulfon(thio)amide compound of the formulae (I) and (II): <CHEM> and <CHEM> wherein X and Y are O or S; R1 is an unsubstituted aromatic mono- or poly- cyclic group, or a substituted phenyl group having a lower alkyl, aryl or halogen; R2 is a substituted alkyl group having an aralkyl or aryloxy, unsubstituted aromatic mono- or poly- cyclic group, or a substituted aromatic mono- or poly- cyclic group having an alkyl, alkenyl, aryl, aralkyl, alkyloxy, aryloxy, aralkyloxy, alkylmercapto, arylmercapto, aralkylmercapto, alkyloxycarbonyl, aryloxy-carbonyl, aralkyloxycarbonyl or halogen, and R3 is a substituted phenyl group with a low alkyl, aryl or halogen, unsubstituted aromatic mono- or poly- cyclic group or aliphatic or cycloaliphatic hydrocarbon group.