Patent ID: 7972991

Claim:
A heat-sensitive recording material having a support and a heat-sensitive recording layer placed over the support, the heat-sensitive recording layer comprising: a leuco dye; a color developer including 3,3′-diallyl-4,4′-dihydroxydiphenylsulfone; a sensitizer including 1,2-di(methylphenoxy)ethane; a crosslinked diphenylsulfone-based compound represented by the general formula (1) wherein n represents an integer of from 1 to 7; and a binder wherein the amount of the 3,3′-diallyl-4,4′-dihydroxydiphenylsulfone is in the range of 100 to 200 parts by mass and the amount of the 1,2-di(methylphenoxy)ethane is in the range of 20 to 90 parts by mass, the parts by mass being based on 100 part by mass of the leuco dye, and the amount of the crosslinked diphenylsulfone-based compound falls in the range of 5 to 10% by mass based on the total mass of solid contained in the heat-sensitive recording layer