| 摘要 |
PROBLEM TO BE SOLVED: To suppress a coloring of the base color, and at the same time, suppress the decoloring of an image, and improve the image preservation property by containing a diphenyl sulfone crosslinking type compound and a polyhydric hydroxy aromatic compound which are represented by respective specified structural formulas, and a higher fatty acid metal salt wherein the number of carbon atoms is kept in a specified numeral value range, in a heat-sensitive recording layer. SOLUTION: A heat-sensitive layer contains a diphenyl sulfone crossliking type compound represented by formula I (in the formula, X and Y each represent a saturated or unsaturated hydrocarbon group of which the number of carbon atoms is 1-12, or formula III (in the formula, R represents a methylene group or an ethylene group) or formula IV (in the formula, T represents a hydrogen atom or an alkyl group of C1-C4). R1-R6 each represent a halogen atom, an alkyl group of C1-C6, or an alkenyl group, m, n, p, q, r and t each are an integer of 0-4, and (a) is an integer of 0-10) as an organic color developer, a higher fatty acid metal salt of which the number of carbon atoms is 16-35 as an electron acceptor, and a polyhybric hydroxyl aromatic compound which is represented by formula II (in the formula, R represents an alkyl group of C18-C35, and n is an integer of 2 or 3) as an electron donor. |
