The present invention provides a recording material which has excellent background stability, specifically heat resistance and heat and humidity resistance of the background. The recording material containing a color forming dye is characterized by containing at least one kind of diphenylsulfone derivative represented by the general formula (I):
(wherein R
1
and R
2
each represents a hydrogen atom or a C1 to C6 alkyl group, n represents an integer of 1 to 6, R
3
and R
4
each represents a halogen atom, a C1 to C6 alkyl group, etc., p and q each represents an integer of 0 to 4, X represents OR
5
or NR
6
R
7
wherein R
5
represents a C1 to C6 alkyl group, a C1 to C6 hydroxyalkyl group, or a C1 to C6 alkoxy-C1 to C6 alkyl group, and R
6
and R
7
each represents a hydrogen atom, a C1 to C6 alkyl group, etc).
本发明提供了一种具有优异的背景稳定性的记录材料,具体是背景的耐热性和耐热湿性。该含有形成颜色的
染料的记录材料的特征在于,它包含至少一种由通式(I)表示的二苯磺酰衍
生物:(其中R1和R2分别表示氢原子或C1至C6烷基,n表示1至6的整数,R3和R4分别表示卤素原子、C1至C6烷基等,p和q分别表示0至4的整数,X表示OR5或NR6R7,其中R5表示C1至C6烷基、C1至C6羟基烷基或C1至C6烷氧基-C1至C6烷基,而R6和R7分别表示氢原子、C1至C6烷基等)。