Heat-developing photographic material

Claim 1

A heat-developable light-sensitive photographic material including a light-sensitive silver halide emulsion comprising core/shell type light-sensitive silver halide grains which contain 4-20 mol % of silver iodide, said shell having a first silver iodide content at least 2% lower than said core, said core having a second silver iodide content between 4 and 20 mol %, said first silver iodide content being between 0 and 6 mol %; a thickness of said shell being 6 to 20% of that of the silver halide grains, said core/shell type silver halide grains having a spread in grain size distribution of not more than 15%; a reducing agent; and at least one of the compounds represented by Formulas (I) to (V) being incorporated in a silver halide emulsion layer containing said light-sensitive silver halide grains and/or in at least one hydrophilic colloidal layer adjacent said silver halide emulsion layer: [R.sub.1 ]--(OH).sub.n (I) where R 1 is a straight-chained, branched or cyclic n-valent hydrocarbon or ether residue having 3 to 10 carbon atoms; and n is an integer of 3 to 10; ##STR47## where R 2 , R 3 and R 4 are each a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or an aryl or heterocyclic group having 6 to 12 carbon atoms; ##STR48## where R 5 , R 6 , R 7 and R 8 are each a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or an aryl or heterocyclic group having 6 to 12 carbon atoms, and X 1 is a simple linkage or a divalent group; ##STR49## where R 9 , R 10- , R 11 and R 12 are each a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an acyl group or an aryl group having 6 to 12 carbon atoms; provided that one of R 9 and R 10 may combine with one of R 11 and R 12 to form a ring; and ##STR50## where R 13 , R 14 , R 16 , R 17 and R 18 are each a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an acyl group or an aryl group having 6 to 12 carbon atoms; and X 2 is a simple linkage or a divalent group; at least one compound represented by Formula (VI) being incorporated in combination with said at least one of the compounds represented by General Formula (I) to (V) in said silver halide emulsion layer containing said light-sensitive silver halide grains: ##STR51## where R 19 is a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; R 20 and R 21 are each an alkyl group; Y 1 and Y 2 are each an oxygen atom, a sulfur atom or a selenium atom; Z 1 , Z 2 , Z 3 , and Z 4 are each a hydrogen atom, a halogen atom, a hydroxyl group, an alkoxy group, an acyl group, an alkoxycarbonyl group, an alkoxycarbonylamino group, an acylamino group, an aryl group, an alkyl group or a cyano group, provided that Z 1 and Z 2 and/or Z 3 and Z 4 may combine with each other to form a ring; X 1 .sup.⊖ is an anion; and m is 0 or 1.