| 摘要 |
PURPOSE: To obtain a thermal recording material having good initial developed color density, reduced in the erasure of a developed color part caused by a plasticizer or the like and excellent in storage stability by adding a specific acyl acid anilide derivative to a thermal recording layer together with bisphenol S. CONSTITUTION: A therfmal recording medium is constituted by adding bis(4- hydroxyphenyl) sulfone and an acyl acid anilide derivative represented by general formula (wherein R1 is a 1-8C alkyl group, a 6-18 aryl group or an alkylaryl group, R2 , R3 and R4 are respectively independently a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group) to a thermal recording layer. The acyl acid anilide dirivative is set to an acetoacetic anilide derivative. By this constitution, initial developed color density and storage stability are improved and the erasure of a developed color part is reduced. |
