A thermal sensitive recording sheet

摘要

A thermally sensitive recording sheet which comprises, on a substrate, a thermally sensitive color developing layer comprising: (a) a colourless or pale coloured basic leuco dye; (b) an organic color developer which is an aminobenzenesulfonamide derivative of the following formula (I): wherein X is oxygen or sulfur, Y is C1-C4 alkyl or an electron attracting group, m is 0 or an integer of 0 to 4 and R is unsubstituted or substituted phenyl, aralkyl, C1-C6 alkyl, C3-C6 cycloalkyl C2-C6 alkenyl or naphthyl; and (c) a sensitizer which is a sulfonamide compound of the following formula (II), present in an amount of 0.01 - 2 parts by weight based on 1 part by weight of the organic colour developer of formula (I) which is component (b): wherein Z is C1-C6 alkyl or an electron attracting group and n is 0, 1 or 2.