Patent ID: 6074799
Filing Date: 2000-06-13
Classification: G03C

Abstract:
A silver halide photographic material comprising a support having thereon at least one photosensitive silver halide emulsion layer, wherein at least one of the silver halide emulsion layer and other hydrophilic colloid layers comprises:i) at least one hydrazine compound represented by the following general formula (N) in the form of a fine solid dispersion and having an average particle size of from 0.01 to 1.0 .mu.m: ##STR205## wherein R.sub.1 represents an aliphatic group, an aromatic group or a heterocyclic group; R.sub.2 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, an alkoxy group, an aryloxy group, an amino group or a hydrazine group; G.sub.1 represents a --CO-- group, an --SO.sub.2 -- group, an --SO-- group,a ##STR206## group, a --CO--CO-- group, a thiocarbonyl group or an iminomethylene group; A.sub.1 and A.sub.2 both represent a hydrogen atom at the same time, or one of A.sub.1 and A.sub.2 represents a hydrogen atom and the other represents a substituted or unsubstituted, alkylsulfonyl, arylsulfonyl or acyl group; and R.sub.3 represents a group selected from those defined above as R.sub.2, and may be different from R.sub.2 ; wherein the minimum amount of the hydrazine compound in the photographic material is 1.times.10.sup.-5 mol per mol of silver halide; and(ii) at least one nucleation accelerator represented by the following general formula (2), (3), (4) or (5): ##STR207## wherein R.sub.1, R.sub.2 and R.sub.3 each represents an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, an alkenyl group, a cycloalkenyl group, an alkynyl group or a heterocyclic residue; m represents an integer; L represents an organic group having a valence of n, and is connected to the P atom with its carbon atom; and n represents an integer of from 1 to 3; ##STR208## wherein A represents an organic group for completing a heterocyclic group; B and C each represents a connecting group comprising one or more of an alkylene, arylene, alkenylene, alkynylene, --SO.sub.2 --, --SO--, --O--, --S--, --N(R.sub.N)-- (wherein R.sub.N represents an alkyl group, an aryl group, an aralkyl group or a hydrogen atom), --C.dbd.O-- and --P.dbd.O-- group; R.sub.1 and R.sub.2 each represents an alkyl group or an aralkyl group; R.sub.3 and R.sub.4 each represents a hydrogen atom or a substituent; andX represents an anion group, provided that X is omitted when the nucleation accelerator represented by general formula (3) or (4) is an intramolecular salt; ##STR209## wherein Z represents an organic group for completing a heterocyclic group, R.sub.5 represents an alkyl group or an aralkyl group; X represents an anion group, provided that X is omitted when the nucleation accelerator represented by general formula (5) is an intramolecular salt, and that no amino groups are contained in the molecule; wherein the minimum amount of the nucleation accelerator in the photographic material is 1.times.10.sup.-5 mol per mol of silver halide.