| 摘要 |
PROBLEM TO BE SOLVED: To obtain a heat-sensitive recording body with excellent preservability of a recorded image and little yellowing of a ground skin part by incorporating an arom. isocyanate compd., an imino compd., 3,3'-diaminodiphenyl sulfone and a phenolic anti-oxidant of formula in a heat-sensitive recording layer. SOLUTION: In a heat-sensitive recording body provided with a heat-sensitive recording layer contg. a leuco dye and a color developing agent on a substrate, an arom. isocyanate compd., an imino compd., 3,3'-diaminodiphenyl sulfone and a phenolic anti-oxidant of formula are incorporated in a heat-sensitive recording layer. In addition, the arom. isocyanate compd. and an imino compd. are reacted by heating to form a dye and the amt. of use of these compd. is pref. in the range of about 10-30 pts.wt. based on 100 pts.wt. leuco dye. In the formula, R1 is a hydrogen atom or a methyl group and R2 is a tert-butyl group or a tert-amyl group and R3 is a methyl group or a tert-amyl group. |
