Silver halide photograhic material
AssigneeFuji Photo Film Co., Ltd.
InventorsTakanori Hioki, Mikio Ihama
Life of this patent
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Abstract
A silver halide photographic material comprising a support having thereon at least one light-sensitive layer, the photographic material comprising a reduction-sensitized silver halide emulsion containing a compound in which a group adsorptive to silver halide and a specific hydrazine structure are covalently bonded. The silver halide photographic material exhibits high sensitivity and improved fog characteristics and improved preservation stability.
Claims6
A silver halide photographic material comprising a support having thereon at least one light-sensitive layer, said photographic material comprising a reduction-sensitized silver halide emulsion containing at least one compound represented by formula (I):
- ##STR22## wherein Het represents a group adsorptive to silver halide grains selected from the group consisting of:
- (1) a 5-, 6- or 7-membered heterocyclic ring having 2 or more hetero atoms,
- (2) a 5-, 6- or 7-membered nitrogen-containing heterocyclic ring having a quaternary nitrogen atom, which is represented by formula (A):
- ##STR23## (3) a 5-, 6- or 7-membered nitrogen-containing heterocyclic ring having a thioxo group, which is represented by formula (B):
- ##STR24## (4) a 5-, 6- or 7-membered nitrogen-containing heterocyclic ring represented by formula (C):
- ##STR25## and (5) a 5-, 6- or 7-membered nitrogen-containing heterocyclic ring represented by formula (D) or (E), ##STR26## wherein Za represents an atomic group necessary to form a 5-, 6- or 7-membered nitrogen-containing heterocyclic ring;
- Ra represents an aliphatic group;
- La and Lb each represent a methine group;
- and n represents 0, 1 or 2, provided that Her is substituted with at least one --(Q).sub.k2 --(Hy) moiety;
- Q represents a divalent linking group comprising an atom selected from the group consisting of a carbon atom, a nitrogen atom, a sulfur atom and an oxygen atom or an atomic group containing at least one atom selected from the group consisting of a carbon atom, a nitrogen atom, a sulfur atom, and an oxygen atom;
- Hy represents a hydrazine structure represented by formula (II):
- ##STR27## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represent an aliphatic group, an aryl group or a heterocyclic group;
- R.sub.1 and R.sub.2, R.sub.3 and R.sub.4, R.sub.1 and R.sub.3, or R.sub.2 and R.sub.4 may be connected to each other to form a ring, provided that at least one of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 represents a divalent aliphatic, aryl or heterocyclic group to which the --(Q).sub.k2 --(Het).sub.k1 moiety is bonded;
- k1 and k3 each represent 1, 2, 3 or 4;
- and k2 represents 0 or 1.
Dependencies are inferred from the claim text.