Patent ID: 7071144
Filing Date: 2006-07-04
Classification: B41M

Abstract:
1. A thermal recording material having a thermal recording layer comprising a generally colorless or light-colored electron-donating dye precursor and an electron-accepting developer that reacts under heat to cause said dye precursor to form a color, said thermal recording layer comprising: 4,4′-dihydroxydiphenylsulfone (1), an amide derivative of the general formula (2), wherein A is an alkyl group, an alkenyl group or an alkylamino group, each of R a fluorane derivative of the general formula (3), wherein each R wherein the weight ratio of the 4,4′-dihydroxydiphenylsulfone (1) and the amide derivative of the general formula (2) (compound (1)/compound (2)) is 2/1 to 1/2, and wherein said thermal recording layer comprises at least one compound selected from the group consisting of a compound of the general formula (4), a compound of the general formula (5), and a compound of the general formula (7), wherein the compound of the general formula (4) is wherein each of R wherein the compound of the general formula (5) is wherein R in which R R R wherein the compound of the general formula (7) is wherein R in which R and each of R