| 摘要 |
PROBLEM TO BE SOLVED: To improve recording sensitivity by using a specific diphenylsulfone crosslinking type compound as an organic developer and using an aromatic compound having a specific aminosulfonyl group as a sensitizer. SOLUTION: A heat-sensitive color developing layer contains a diphenylsulfone crosslinking type compound represented by formula I (X and Y are each linear or branched 1-12C saturated or unsaturated hydrocarbon group which may be different and may have an ether bond, R1 to R6 are each independently a halogen atom, 1-6C alkyl group, or alkenyl group, m, n, p, q, r and t are each an integer of 0 to 4, and a is an integer of 1 to 10) as an organic developer, and 0.01 to 2 pts. of at least one type of a compound represented by formula II as a sensitizer (R7 is a 1-6C alkyl group or an electron attractive group, and u is an integer of 0 to 2.) to 1 pt. of the developer represented by the formula I. |
