| abstract |
(57) [Summary] [Purpose] To provide a heat-sensitive recording material with less background fog in a high temperature environment and less decrease in recording density over time. [Structure] A heat-sensitive recording material comprising a support and a recording layer containing a colorless or light-colored basic dye and a coloring agent, In the recording layer, 3- (N-ethyl-p-) as a basic dye is used. Toluidino) -6-methyl-7-anilinofluorane, A heat-sensitive recording material containing 4,4'-dihydroxydiphenyl sulfone or 2,4'-dihydroxydiphenyl sulfone as a coloring agent. |