Patent ID: 6921740

Claim:
A heat-sensitive recording material having a substrate and a heat-sensitive recording layer formed on the substrate, the heat-sensitive recording layer having dispersed therein (1) an electron-donating normally colorless or slightly colored dye precursor and (2) an electron-accepting compound which reacts with the electron-donating dye precursor under heat to cause said electron-donating dye precursor to form a color, wherein said heat-sensitive recording layer contains at least one member selected from the electron-accepting compound of the general formula (I), in which each of R 1 to R 9 respectively represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, an aralkyl group having 7 to 10 carbon atoms or an aryl group having 6 to 14 carbon atoms, arbitrary two groups selected from R 1 to R 5 may bond to each other to form a ring, arbitrary two groups selected from R 6 to R 9 may bond to each other to form a ring, and R 10 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, an aralkyl group having 7 to 10 carbon atoms or an aryl group having 6 to 14 carbon atoms, and N,N′-bis(2-hydroxyphenyl)-4,4′-biphenyldisulfonamide; and at least one electron-accepting compound selected from a diphenylmethane derivative, a benzoic acid derivative, a salicylic acid derivative and a urea derivative.