| 摘要 |
PROBLEM TO BE SOLVED: To improve stability and storing properties of a recording image by using a carboxylic acid of formula as a color developing agent for developing a leuco dye on a substrate when it is heated. SOLUTION: In a heat-sensitive recording material with a heat-sensitive color developing layer wherein a leuco dye and a color developing agent for developing the leuco dye in heating are main ingredients, as the color developing agent, a carboxylic acid compd. of formula I is used. In the formula I, n is an integer of 1-3, R1 is a hydroxide group, an alkyl group, an alkoxy group, a halogen group or a hydrogen atom and R2 is an aliph. hydrocarbon group. In addition, X is a divalent group of formula II, wherein p and q are respectively integer of 0 or 1 and A is a divalent aliph. hydrocarbon group and B is a divalent aliph. hydrocarbon group or an arom. hydrocarbon group which may have a substd. group. In addition, Y and Z are respectively a divalent group contg. at least one heteroatom and they may be the same or different from each other. |
