Patent ID: 6060228
Filing Date: 2000-05-09
Classification: G03C

Abstract:
A photothermographic element comprisinga support having a pair of opposed surfaces,a photosensitive layer containing an organic silver salt, a silver halide, and a reducing agent on one surface of the support, andat least one back layer on the other surface of the support, the outermost layer of said at least one back layer being based on a binder containing at least 50% by weight of a polymer latex, whereinsaid back layer contains a dye of the following formula (I): ##STR126## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently hydrogen, aliphatic, aromatic or heterocyclic groups, X.sup.1 and X.sup.2 are independently oxygen or sulfur atoms, L.sup.1, L.sup.2, and L.sup.3 are independently methine groups, letter n is equal to 0, 1, 2 or 3, and M.sup.+ is a hydrogen atom or an inorganic or organic cation, with the proviso that R.sup.1, R.sup.2, R.sup.3, R.sup.4, L.sup.1, L.sup.2, and L.sup.3 are free of groups having ionizable proton or salts thereof, and at least one of L.sup.1, L.sup.2, and L.sup.3 has a substituent in case of n=2, andsaid dye has a maximum absorption wavelength .lambda.max (nm) in the layer satisfying the relationship represented by the following formula (II):.lambda.max>{.lambda.max(DMF)+20.times.(n+1)} (II)wherein .lambda.max(DMF) is the maximum absorption wavelength (nm) of the dye in a dimethylformamide solution and n is as defined in formula (I).