4-Hydroxydiphenylsulfone derivatives represented by formula (I)
wherein
Ri, R2, R3 and R4, independently from one another, each denote a hydrogen atom, an alkyl group, a substituted or unsubstituted phenyl group or a cycloalkyl group, provided at least one of R1, R2, R3 and R4 is other than a hydrogen atom, and
R denotes an alkyl group, an alkenyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted cycloalkyl group or a substituted or unsubstituted phenylalkyl group.
Said compounds are useful as a developer in a heat sensitive color formation layer of a heat sensitive recording material.
公式(I)所代表的
4-羟基二
苯基砜衍
生物,其中R1、R2、R3和R4各自独立地表示
氢原子、烷基、取代或未取代
苯基或
环烷基,但至少有一个R1、R2、R3和R4不是
氢原子,且R表示烷基、
烯基、取代或未取代
苯基、取代或未取代
环烷基或取代或未取代
苯基烷基。所述化合物可用作热敏感记录材料的热敏感彩色形成层中的显影剂。