US4268620A — Method of processing of light-sensitive silver ha…

Claim 1

Independent Claim 275 words

A method of processing a light-sensitive silver halide black and white photographic material to obtain a high contrast black and white silver image, said material comprising a support containing a silver halide emulsion layer containing silver halide grains having an average grain size of 0.25 to 0.5μ, at least 80% of said silver halide grains being of a grain size which falls within the range of 0.7 times said average grain size to 1.3 times said average grain size, said silver halide comprising (i) silver chlorobromide or silver chloroiodobromide, and (ii) at least 50 mole % of silver chloride, and a sensitizing dye, and also contains a tetrazolium compound selected from the group consisting of the compounds having the following general formulas I, II or III: ##STR13## wherein R 1 , R 3 , R 4 , R 5 , R 8 , R 9 , R 10 and R 11 each represent an alkyl, alkenyl, aryl or heterocyclic group; R 2 , R 6 and R 7 each represent allyl, phenyl, naphthyl, heterocyclic, alkyl or amino group, carboxyl, an alkoxycarbonyl group, mercapto, nitro or hydrogen; D represents an arylene group; E represents an alkylene, arylene or aralkylene group; X⊖ is an anion; and n is 1 or 2, provided that the compound forms an intramolecular salt when n is 1, comprising exposing said photographic material to an image and to light, and then developing said exposed photographic material in a developing solution which does not contain hydroquinone selected from the group consisting of Metol, phenidone and Metol, p-aminophenol and catechol, and phenidone and p-aminophenol, to form said high contrast black and white silver image.

Claim 2

Independent Claim 275 words

A method of processing a light-sensitive silver halide black and white photographic material to obtain a high contrast black and white silver image, said material comprising a support containing a silver halide emulsion layer containing silver halide grains having an average grain size of 0.25 to 0.5μ, at least 80% of said silver halide grains being of a grain size which falls within the range of 0.7 times said average grain size to 1.3 times said average grain size, said silver halide comprising (i) silver chlorobromide or silver chloroiodobromide, and (ii) at least 50 mole % of silver chloride, and a sensitizing dye, and also contains a tetrazolium compound selected from the group consisting of the compounds having the following general formulas I, II or III: ##STR13## wherein R 1 , R 3 , R 4 , R 5 , R 8 , R 9 , R 10 and R 11 each represent an alkyl, alkenyl, aryl or heterocyclic group; R 2 , R 6 and R 7 each represent allyl, phenyl, naphthyl, heterocyclic, alkyl or amino group, carboxyl, an alkoxycarbonyl group, mercapto, nitro or hydrogen; D represents an arylene group; E represents an alkylene, arylene or aralkylene group; X⊖ is an anion; and n is 1 or 2, provided that the compound forms an intramolecular salt when n is 1, comprising exposing said photographic material to an image and to light, and then developing said exposed photographic material in a developing solution which does not contain hydroquinone selected from the group consisting of Metol, phenidone and Metol, p-aminophenol and catechol, and phenidone and p-aminophenol, to form said high contrast black and white silver image.

Claim 3

Dependent Claim 211 words

A method according to claim 1 wherein said silver halide emulsion layer contains at least a sensitizing dye selected from the group consisting of the compounds having the general formulae [IV] to [X]: ##STR14## wherein R 12 , R 13 and R 14 each represent a group selected from an alkyl group, a substituted alkyl group, an aryl group, and a substituted aryl group; L 1 , L 2 and L 3 each represent a methynyl group or a substituted methynyl group; Z 1 , Z 2 and Z 3 each represent an atom or atomic group necessary for forming a 5 to 6 membered heterocyclic ring; P and Q each represent cyano, --COOR 15 , --COR 15 or --SO 2 R 15 in which R 15 represents an alkyl group; Q 1 and Q 2 each represent an atomic group necessary for forming a thiooxazolone ring, a pyrazolone ring, an oxyindole ring, a barbituric acid, a 2-thiobarbituric acid, a 2,4-oxazolidinedione ring, a 2,4-thiazolidinedione ring, a 2,4-imidazolidinedione ring, a 2-thio-2,4-oxazolidinedion ring, a 2-thio-2,4-thiazolidinedione ring, a 2-thio-2,4-selenazolidinedione ring, a 2-thio-2,5-thiazolidinedione ring, a 2-thio-hydantoine ring, a 4-oxazolidinone ring, a 4-thiazolinone ring or a 4-imidazoline ring; Y represents a hydrogen atom, an amino group, an alkylamino group, a dialkylamino group and a halogen atom.

Claim 4

Dependent Claim 18 words

A method according to claim 1 wherein the tetrazolium compound is present in the silver halide emulsion layer.

Claim 5

Dependent Claim 32 words

A method according to claim 1 wherein the photographic material further comprises a hydrophilic colloidal layer adjacent to the silver halide emulsion layer, the compound being present in the hydrophilic colloidal layer.

Claim 6

Dependent Claim 90 words

A method according to claim 1 wherein the cation moiety of the tetrazolium compound is selected from the group consisting of the following: (1) 2,3,5-Triphenyl-2H-tetrazolium (2) 2,3,5-Tri(p-carboxyethylphenyl)-2H-tetrazolium (3) 2-(Benzothiazol-2-yl)-3-phenyl-5-(o-chlorophenyl)-2H-tetrazolium (4) 2,3-Diphenyl-2H-tetrazolium (5) 2,3-Diphenyl-5-methyl-2H-tetrazolium (6)3-(p-Hydroxyphenyl)-5-methyl-2-phenyl-2H-tetrazolium (7) 2,3-Diphenyl-5-ethyl-2H-tetrazolium (8) 2,3-Diphenyl-5-n-hexyl-2H-tetrazolium (9) 5-Cyano-2,3-diphenyl-2H-tetrazolium (10) 2-(Benzothiazol-2-yl)-5-phenyl-3-(4-tolyl)-2H-tetrazolium (11) 2-(Benzothiazol-2-yl)-5-(4-chlorophenyl)-3-4-(nitrophenyl)-2H-tetrazolium (12) 5-Ethoxycarbonyl-2,3-di(3-nitrophenyl)-2H-tetrazolium (13) 5-Acetyl-2,3-di(p-ethoxyphenyl)-2H-tetrazolium (14) 2,5-Diphenyl-3-(p-tolyl)-2H-tetrazolium (15) 2,5-Diphenyl-3-(p-iodophenyl)-2H-tetrazolium (16) 2,3-Diphenyl-5-(p-diphenyl)-2H-tetrazolium (17) 5-(p-Bromophenyl)-2-phenyl-3-(2,4,6-trichlorophenyl)-2H-tetrazolium (18) 3-(p-Hydroxyphenyl)-5-(p-nitrophenyl)-2-phenyl-2H-tetrazolium (19) 5-(3,4-Dimethoxyphenyl)-3-(2-ethoxyphenyl)-2-(4-methoxyphenyl)-2H-tetrazolium (20) 5-(4-Cyanophenyl)-2,3-diphenyl-2H-tetrazolium (21) 3-(p-Acetamidophenyl)-2,5-diphenyl-2H-tetrazolium (22) 5-Acetyl-2,3-diphenyl-2H-tetrazolium (23) 5-(Fur-2-yl)-2,3-diphenyl-2H-tetrazolium (24) 5-(Thien-2-yl)-2,3-diphenyl-2H-tetrazolium (25) 2,3-Diphenyl-5-(pyrid-4-yl)-2H-tetrazolium (26) 2,3-Diphenyl-5-(quinol-2-yl)-2H-tetrazolium (27) 2,3-Diphenyl-5-(benzoxazol-2-yl)-2H-tetrazolium (28) 2,3-Diphenyl-5-nitro-2H-tetrazolium (29) 2,2',3,3'-Tetraphenyl-5,5'-1,4-butylene-di(2H-tetrazolium) (30) 2,2',3,3'-Tetraphenyl-5,5'-P-phenylene-di(2H-tetrazolium) (31) 2-(4,5-Dimethylthiazol-2-yl)-3,5-diphenyl-2H-tetrazolium (32) 3,5-Diphenyl-2-(triazin-2-yl)-2H-tetrazolium (33) 2-(Benzothiazol-2-yl)-3-(4-methoxyphenyl)-5-phenyl-2H-tetrazolium (34) 2-p-Iodophenyl-3-nitrophenyl-5-phenyl-2H-tetrazolium.

Claim 7

Dependent Claim 25 words

A method according to claim 1 wherein the light-sensitive silver halide photographic material further comprises a protective layer having a thickness of 0.1 to 10μ.

Claim 8

Dependent Claim 19 words

A method according to claim 1 wherein the tetrazolium compound is a compound obtained from 2,3,5-triphenyl-aH-tetrazolium and diisopropylnaphthalenedisulfonic acid.

Claim 9

Dependent Claim 19 words

A method according to claim 1 wherein the tetrazolium compound is a compound obtained from 2,3,5-triphenyl-aPh-tetrazolium and diethylhexylsuccinatesulfonic acid.

Claim 10

Dependent Claim 23 words

A method according to claim 1 wherein the developing solution contains a sulfite in an amount of more than 10 g per liter.

Claim 11

Dependent Claim 18 words

A method according to claim 1 wherein the developing solution has a pH value of 8.5 to 12.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-05-18	1984-11-17	1985-05-19	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-05-18	1988-11-17	1989-05-19	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-05-18	1992-11-17	1993-05-19	$7700.00	Window Closed / Lapsed

Method of processing of light-sensitive silver halide photographic material

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag