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US 5,221,593 AGranted
Silver halide photographic materials containing novel nucleating agent
AssigneeKonica Corporation
InventorsAkira Onodera, Yasushi Usagawa
Life of this patent
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Abstract
The improved silver halide photographic material contains a novel nucleating compound that is useful either as a contrast increasing agent in light-sensitive material for use in photochemical processes or as a foggant in direct positive light-sensitive materials.
Claims7
A silver halide photographic material comprising a silver halide emulsion layer, wherein said silver halide photographic material contains a compound represented by the following general formula (I):
- ##STR20## where R.sup.1 is an unsubstituted alkyl or an alkyl substituted by at least one group selected from the group consisting of aryl, hetero cyclic ring, hydroxy, unsubstituted alkoxy, sulfonamido, aryloxy, ureido, carbamoyl, acylamino and sulfamoyl, R.sup.2 is a hydrogen atom, an alkyl group, an aryl group or a heterocyclic ring, R is a hydrogen atom or a blocking group;
- L is an alkylene or alkenylene group;
- J is a linkage group;
- X is an aromatic or heterocyclic residue;
- A.sup.1 and A.sup.2 are each a hydrogen atom, or either one of them is a hydrogen atom and the other is an acyl, sulfonyl or oxalyl group.
2 more elements
Dependencies are inferred from the claim text.