Patent ID: 6824962
Filing Date: 2004-11-30
Classification: G03C

Abstract:
A photothermographic material comprising a photosensitive silver halide, a non-photosensitive silver salt of an organic acid, a reducing agent for silver ions and a binder on one surface of a support, wherein the material comprises at least one compound satisfying (iv) and that said compound also satisfying at least one of (i) to (iii) below and an organic gold compound, but does not contain hydrazine derivatives, and the photosensitive silver halide has a mean grain size of 0.12 &mgr;m or less:(i) a compound producing imagewise a chemical species that can form development initiation points on and in the vicinity of the non-photosensitive silver salt of an organic acid (except for hydrazine derivatives) (ii) a compound that provides increase of developed silver grain density to a level of 200-5000% when it is added in an amount of 0.01 mol/mol of silver (except for hydrazine derivatives); (iii) a compound that provides increase of covering power to a level of 120-1000% when it is added in an amount of 0.01 mol/mol of silver (except for hydrazine derivatives); (iv) a compound represented by any one of the following formulas (1) to (3): wherein, R1, R2 and R3 each independently represents a hydrogen atom or a substituent, Z represents an electron-withdrawing group, and R1 and Z, R2 and R3, R1 and R2, or R3 and Z may be combined with each other to form a ring structure, wherein, R4 represents a substituent, wherein, X and Y each independently represent a hydrogen atom or a substituent, A and B each independently represents an alkoxy group, an alkylthio group, an alkylamino group, an aryloxy group, an arylthio group, an anilino group, a heterocyclyloxy group, a heterocyclylthio group or a heterocyclylamino group, and X and Y or A and B may be combined with each other to form a ring structure.