Patent ID: 6875551

Claim:
A heat-sensitive recording material comprising a substrate and a heat-sensitive recording layer containing a diazonium salt and a coupler, the heat-sensitive recording layer being disposed on or over the substrate, wherein the diazonium salt is a compound represented by the following general formula (1): wherein R 1 and R 2 each independently represent an alkyl group or an aryl group; R 5 , R 6 , R 7 , R 8 and R 9 each independently represent one selected from the group consisting of a hydrogen atom, a chlorine atom, a bromine atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, a cyano group, an alkylthio group, an arylthio group, an alkylsulfonyl group, an arylsulfonyl group, an amino group, an amido group, and a nitro group; and two or more of R 1 , R 2 , R 5 , R 6 , R 7 , R 8 and R 9 may be bonded to each other to form a ring.