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US 5,424,170 AGranted
Silver halide photographic light sensitive material
AssigneeKonica Corporation
InventorsSusumu Sudo, Yasushi Usagawa
Life of this patent
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Abstract
A silver halide photographic light sensitive material contains a novel nucleating compound represented by the following formula (I), which is capable of functioning as a contrast increasing agent in a negative system or as a foggant in a direct positive system ##STR1##
Claims8
A silver halide photographic light sensitive material comprising a support having thereon a silver halide emulsion, wherein said silver halide photographic material contains a compound represented by the following formula (I):
- ##STR42## wherein R.sub.1 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group;
- R.sub.2 represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group;
- R represents a hydrogen atom or a blocking group;
- L represents an alkylene group or an alkenylene group, provided that R.sub.1 --S--L group contains at least two cyclic groups, which may be bonded, directly or through an aliphatic linkage group, with each other;
- J.sub.1 and J.sub.2 each represent a linkage group;
- n is 0 or 1;
- X represents an aromatic or heterocyclic residue;
- A.sub.1 and A.sub.2 are each hydrogen atoms, or one of them is a hydrogen atom and the other one is an acyl group, a sulfonyl group or an oxalyl group.
5 more elements
Dependencies are inferred from the claim text.