Light-sensitive silver halide photographic material containing tetrazolium compounds

Claim 2

A light-sensitive silver halide photographic material which consists essentially of a support, at least one hydrophilic colloidal layer coated thereon containing silver halide grains having an average grain size of from 0.05 to 1.5 μand at least 75% of which grains being within a range of from 0.6 to 1.4 times said average grain size, and a tetrazolium compound selected from the group consisting of a compound of formulae [I], [II] or [III]: ##STR2## wherein R 1 , R 3 , R 4 , R 5 , R 8 , R 9 , R 10 and R 11 each represent an aryl group or a heterocyclic group; R 2 , R 6 and R 7 each represents an aryl group, a heterocyclic group, an alkyl group, hydroxyl, carboxyl or the salt thereof, an amino group, mercapto, nitro or hydrogen; D represents a divalent aromatic group; E represents an alkylene group, an arylene group or an aralkylene group; X is an anion; said heterocyclic group being selected from the group consisting of a thiadiazolyl group, a benzothiadiazolyl group, an oxazolyl group, a pyrimidinyl group, a pyridyl group and a 2,5-dimethylthiazolyl group; and n is 1 or 2, provided that the compound forms an intramolecular salt when n is 1.

Claim 3

A light-sensitive silver halide photographic material according to claim 1 which material is to be treated with a developing solution containing a hydroquinone and Metol or phenidone and consists essentially of a support, at least one hydrophilic colloidal layer coated thereon containing silver halide grains having an average grain size of from 0.05 to 1.5 μ and at least 75% of which grains being within a range of from 0.6 to 1.4 times said average grain size, and a tetrazolium compound selected from the group consisting of a compound of formulae [I], [II] or [III]: ##STR3## wherein R 1 , R 3 , R 4 , R 5 , R 8 , R 9 , R 10 and R 11 each represents an aryl group or a heterocyclic group; R 2 , R 6 and R 7 each represents an aryl group, a heterocyclic group , an alkyl group, hydroxyl, carboxyl or the salt thereof, an amino group, mercapto, nitro or hydrogen; D represents a divalent aromatic group; E represents an alkylene group, an arylene group or an aralkylene group; X is an anion; said heterocyclic group being selected from the group consisting of a thiadiazolyl group, a benzothiadiazolyl group, an oxazolyl group, a pyrimidinyl group, a pyridyl group and a 2,5-dimethylthiazolyl group; and n is 1 or 2, provided that the compound forms an intramolecular salt when n is 1 according to claim 1 wherein the tetrazolium compound is non-diffusible.

Claim 4

A light-sensitive silver halide photographic material according to claim 1 wherein the tetrazolium compound is non-diffusible.

Claim 5

A light-sensitive silver halide photographic material according to claim 1 wherein the tetrazolium compound is diffusible.

Claim 6

A light-sensitive silver halide photographic material according to claim 1 wherein the hydrophilic colloidal layer is a gelatin layer.

Claim 7

A light-sensitive silver halide photographic material according to claim 1, wherein the silver halide has an average grain size of from 0.1 to 0.5μ and at least 80% grains are within a range of from 0.7 to 1.3 times said average grain size, the silver halide being silver chlorobromide or chloroiodobromide containing at least 50 mole % silver chloride.

Claim 8

A light-sensitive silver halide photographic material according to claim 1 wherein the tetrazolium compound is present in the at least one hydrophilic colloidal layer.

Claim 9

A light-sensitive silver halide photographic material according to claim 1 wherein the photographic material further comprises a gelatin layer adjacent to the at least one hydrophilic layer, the compound being present in the gelatin layer.

Claim 10

A light-sensitive silver halide photographic material according to claim 1 wherein the cation moiety of the tetrazolium compound is selected from the group consisting of the following: (1) 2-(Benzothiazol-2-yl)-3-phenyl-5-dodecyl-2H-tetrazolium (2) 2,3-Diphenyl-5-(4-t-octyloxyphenyl)-2H-tetrazolium (3) 2,3,5-Triphenyl-2H-tetrazolium (4) 2,3,5-Tri(p-carboxyethylphenyl-2H-tetrazolium (5) 2-(Benzothiazol-2-yl)-3-phenyl-5-(o-chlorophenyl)-2H-tetrazolium (6) 2,3-Diphenyl-2H-tetrazolium (7) 2,3-Diphenyl-5-methyl-2H-tetrazolium (8) 3-(p-Hydroxyphenyl)-5-methyl-2-phenyl-2H-tetrazolium (9) 2,3-Diphenyl-5-ethyl-2H-tetrazolium (10) 2,3-Diphenyl-5-n-hexyl-2H-tetrazolium (11) 5-Cyano-2,3-diphenyl-2H-tetrazolium (12) 2-(Benzothiazol-2-yl)-5-phenyl-3-(4-tolyl)-2H-tetrazolium (13) 2-(Benzothiazol-2-yl)-5-(4-chlorophenyl)-3-(4-nitrophenyl)-2H-tetrazolium (14) 5-Ethoxycarbonyl-2,3-di(3-nitrophenyl)-2H-tetrazolium (15) 5-Acetyl-2,3-di(p-ethoxyphenyl)-2H-tetrazolium (16) 2,5-Diphenyl-3-(p-tolyl)-2H-tetrazolium (17) 2,5-Diphenyl-3-(p-iodophenyl)-2H-tetrazolium (18) 2,3-Diphenyl-5-(p-diphenyl)-2H-tetrazolium (19) 5-(p-Bromophenyl)-2-phenyl-3-(2,4,6-trichlorophenyl)-2H-tetrazolium (20) 3-(p-Hydroxyphenyl)-5-(p-nitrophenyl)-2-phenyl-2H-tetrazolium (21) 5-(3,4-Dimethoxyphenyl)-3-(2-ethoxyphenyl)-2-(4-methoxyphenyl)-2H-tetrazolium (22) 5-(4-Cyanophenyl)-2,3-diphenyl-2H-tetrazolium (23) 3-(p-Acetamidophenyl)-2,5-diphenyl-2H-tetrazolium (24) 5-Acetyl-2,3-diphenyl-2H-tetrazolium (25) 5-(Fur-2-yl)-2,3-diphenyl-2H-tetrazolium (26) 5-(Thien-2-yl)-2,3-diphenyl-2H-tetrazolium (27) 2,3-Diphenyl-5-(pyrid-4-yl)-2H-tetrazolium (28) 2,3-Diphenyl-5-(quinol-2-yl)-2H-tetrazolium (29) 2,3-Diphenyl-5-(benzoxazol-2-yl)-2H-tetrazolium (30) 2,3-Diphenyl-5-nitro-2H-tetrazolium (31) 2,2',3,3'-Tetraphenyl-5,5'-1,4-butylene-di-(2H-tetrazolium) (32) 2,2',3,3'-Tetraphenyl-5,5'-p-phenylene-di-(2H-tetrazolium) (33) 2-(4,5-Dimethylthiazol-2-yl)-3,5-diphenyl-2H-tetrazolium (34) 3,5-Diphenyl-2-(triazin-2-yl)-2H-tetrazolium (35) 2-(Benzothiazol-2-yl)-3-(4-methoxyphenyl)-5-phenyl-2H-tetrazolium (36) 2,5-Diphenyl-3-α-naphthyl-2H-tetrazolium (37) 3,3'-(3,3'-Dimethoxy-4,4'-diphenylene)-2,2',5,5'-tetraphenyl-di-(2H-tetrazolium).

Claim 11

A light-sensitive silver halide photographic material according to claim 1 wherein the light-sensitive silver halide photographic material further comprises an outermost gelatin protective layer having a thickness of from 0.1 to 10 μ on the hydrophilic colloidal layer.