Patent ID: 6358677
Filing Date: 2002-03-19
Classification: G03C

Abstract:
A heat-developable recording material having, at least on one side of the support,(a) reducible silver salt, (b) a hindered phenol, (c) a binder, (d) at least one compound represented by the formula (1) below, and (e) an ultrahigh contrast agent; wherein content of the compound represented by the formula (1) begin 1 to 20 mol % based on the reducing agent: in formula (1), R1, R2, R3, X1 and X2 independently represent a hydrogen atom; halogen atom; or substituent which is bound to the benzene ring via a carbon atom, oxygen atom, nitrogen atom, sulfur atom or phosphorous atom, at least either X1 or X2 represents a group represented as âˆ’NR4R5, where R4 and R5 independently represent a group selected from a hydrogen atom, alkyl group, alkenyl group, alkynyl group, aryl group, or a group represented by â€”Câ€”(=O)â€”R, â€”Câ€”(=O)â€”C (R represents a group selected from a hydrogen atom, alkyl group, aryl group, heterocyclic group, amino group, alkoxy group and aryloxy group; adjacent groups of the above substituents may bind each other to form a ring;wherein the ultrahigh contrast agent is at least one compound selected from the group consisting of the compounds respectively represented by the formulae (2), (3) and (4), below: in formula (2), R6, R7 and R8 independently represent a hydrogen atom or substituent, and Z represents an electron withdrawing group or silyl group, wherein in formula (2), R6 and Z; R7 and R8; R6 and R7; or R8 and Z may bind with each other to form a ring structure, wherein in formula (3), R9 represents a substituent, wherein in formula (4), X and Y independently represent a hydrogen atom or substituent; and A and B independently represent an alkoxy group, alkylthio group, alkylamino group, aryloxy group, arylthio group, anilino group, heterocyclic oxy group, heterocyclic thio group or heterocyclic amino group, and wherein in formula (4), X and Y; or A and B may bind with each other to form a ring structure.