| 摘要 |
PROBLEM TO BE SOLVED: To ensure a sufficient coloring sensitivity by an arrangement wherein a thermal recording layer contains a homopolymer or copolymer of a specified hydroxystyrene derivative and a sensitizer, i.e., at least one kind of specified acylacetate anilide derivative or diphenylsulfone derivative. SOLUTION: A thermal recording layer contains a homopolymer or copolymer of a hydroxystyrene derivative shown by formula I (where, R1 represents a hydrogen atom or an alkyl group of 1-8C) and a sensitizer, i.e., at least one kind of acylacetate anilide derivative shown by formula II (where, R<2> represents an alkyl group of 1-8C, an aryl group of 6-18C or an alkyl aryl group, R3 , R4 , R5 represents a hydrogen atom, a halogen atom or an alkyl or alkoxy group of 1-8C, independently) or diphenylsulfone derivative shown by formula III (where, R5 , R7 R8 , R9 , R10 , R11 represents a hydrogen atom, a halogen atom or an alkyl or alkoxy group of 1-8CR2 , independently). |
