Thermally-responsive record material

A thermally-responsive record material comprising a substrate having provided thereon in substantially contiguous relationship an electron donating dye precursor, an acidic developer material, a compound of the formula:

• 12
• wherein R1 is selected from hydrogen, alkoxy, aralkoxy, wherein R4 is aralkoxyalkoxy or alkylalkoxyalkoxy
• said alkyl moieties of the alkoxy, aralkoxy, alkoxyalkoxy and aralkoxyalkoxy groups each independently being from one to eight carbons,
• said aryl moieties of the aryl, aralkyl, aralkoxy and aralkoxyalkoxy groups each independently being unsubstituted or substituted by alkyl (C1-C8), alkoxy (C1-C8) or halogen,
• and a suitable binder therefor.

A thermally-responsive record material comprising a substrate having provided thereon in substantially contiguous relationship an electron donating dye precursor, an acidic developer material, a compound of the formula:

• 33
• wherein R1 and R2 and R3 are each independently selected from hydrogen, alkyl, alkoxy, aryl, aralkyl, aralkoxy, halogen, alkoxyalkoxy and aralkoxyalkoxy groups,
• wherein R5 is independently selected from alkyl and aralkyl,
• said alkyl moieties of the alkyl, alkoxy, aralkyl, aralkoxy, alkoxyalkoxy and aralkoxyalkoxy groups each independently being from one to eight carbons,
• said aryl moieties of the aryl, aralkyl, aralkoxy and aralkoxyalkoxy groups each independently being unsubstituted or substituted by alkyl (C1-C8), alkoxy (C1-C8) or halogen,
• and a suitable binder therefor.