| 摘要 |
PROBLEM TO BE SOLVED: To provide superior heat responce properties, resistance to humidity and resistance to plasticizer and control the first coat fog and whitening by containing a specified organic acidic substance and a specified sensitizer in a heat-sensitive coloring layer. SOLUTION: A heat-sensitive coloring layer containing a leuco dye which is colorless or of light color at the normal temperature and an organic acidic substance reacting with the leuco dye by heating is formed on a sustrate. At least one kind compound represented by the formula I (In the formula, X represents an ocygen or sulfur atom, Z represents a non-sustituent aromatic group or an aromatic group substituted with alower alkyl or halogen atom, A represents a group of bivalence or more and (n) represents an integer of 2 or more.) as an organic acidic substance and 3,4,5-trimethoxymethyl ester benzoate as a sensitizer represented by the formula II are contained. Superior heat responce properties are generated and the first coat fog and whitening of a recorded image are controlled by the relative action of the above-referred leuco dye, the organic acidic substance and the sensitizer. |
