# US 4,374,923 A · Direct positive silver halide photographic light-sensitive material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,374,923 A - Document ID: US4374923A - Status: Granted - Kind: A - Application number: 06/322,137 - Filed: 1981-11-17 - Granted: 1983-02-22 - Earliest claimed: 1980-11-19 - Assignees: Fuji Photo Film Co., Ltd. - Inventors: Shigeo Hirano; Tadao Sugimoto; Nobuyuki Tsujino - Web page: https://patentgrep.com/patent/US4374923A ## CPC - G03C 1/48561: {hydrazine compounds} - G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G) ## Abstract A direct positive silver halide photographic light-sensitive material is described comprising a support having coated thereon at least one light-sensitive silver halide photographic emulsion layer, wherein at least one layer of the light-sensitive silver halide photographic emulsion layers and other hydrophilic colloid layers contains a compound represented by formula (I) ##STR1## wherein R.sup.1 and R.sup.2 can each represent a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group; R.sup.3 represents a hydrogen atom or an aliphatic group; R.sup.4 represents a hydrogen atom, an aliphatic group, or an aromatic group; and X represents a divalent aromatic group. The direct positive silver halide photographic light-sensitive material containing the above novel fogging agent compound has good preservability and provides excellent reversal photographic images in spite of changes (1) in the bromine ion concentration in a developing solution used for processing, (2) in the particle size of the internal latent image type silver halide grains, and (3) in the amount of the fogging agent employed. ## Claims ### Claim 1 A direct positive silver halide photographic light-sensitive material comprising a support having coated thereon at least one light-sensitive internal latent image silver halide photographic emulsion layer, said silver halide photographic emulsion not being previously fogged, wherein at least one layer of the light-sensitive silver halide photographic emulsion layers and other hydrophilic colloid layers contains a fogging amount of a compound represented by formula (I) ##STR8## wherein R.sup.1 and R.sup.2 can each represent a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group; R.sup.3 represents a hydrogen atom or an aliphatic group; R.sup.4 represents a hydrogen atom, an aliphatic group, or an aromatic group; and X represents a divalent aryl group. ### Claim 2 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the aliphatic groups represented by R.sup.1, R.sup.2, and R.sup.4 are a straight chain or branched chain alkyl group which may be substituted, a cycloalkyl group which may be substituted, an alkenyl group, or an alkynyl group. ### Claim 3 (depends on 2) A direct positive silver halide photographic light-sensitive material as in claim 2, wherein the substituent for the substituted alkyl group or the substituted cycloalkyl group is an alkoxy group, an alkoxycarbonyl group, a carbamoyl group, a hydroxy group, an alkylthio group, an amido group, an acyloxy group, a cyano group, a sulfonyl group, a halogen atom, or an aryl group. ### Claim 4 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the aromatic groups represented by R.sup.1, R.sup.2 and R.sup.4 are a phenyl group which may be substituted or a naphthyl group which may be substituted. ### Claim 5 (depends on 4) A direct positive silver halide photographic light-sensitive material as in claim 4, wherein the substituent for the substituted phenyl group or the substituted naphthyl group is an alkyl group, an alkoxy group, an acylhydrazino group, a dialkylamino group, an alkoxycarbonyl group, a cyano group, a carboxy group, a nitro group, an alkylthio group, a hydroxy group, a sulfonyl group, a carbamoyl group, a halogen atom, an acylamino group, a sulfonamido group, or a thiourea group. ### Claim 6 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the heterocyclic groups represented by R.sup.1 and R.sup.2 are a 5-membered or 6-membered single ring, or a condensed ring, having at least one hetero atom selected from oxygen, nitrogen, sulfur, and selenium, and the heterocyclic group may be substituted. ### Claim 7 (depends on 6) A direct positive silver halide photographic light-sensitive material as in claim 6, wherein the substituent for the substituted heterocyclic group is an alkyl group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms, an aryl group having from 6 to 18 carbon atoms, a halogen atom, an alkoxycarbonyl group, a cyano group, or an amido group. ### Claim 8 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein one of R.sup.1 and R.sup.2 is a hydrogen atom. ### Claim 9 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein R.sup.4 is a hydrogen atom or a methyl group. ### Claim 10 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein R.sup.4 is a hydrogen atom. ### Claim 11 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the aliphatic group represented by R.sup.3 is a straight chain or branched chain alkyl group which may be substituted, a cycloalkyl group which may be substituted, an alkenyl group, or an alkynyl group. ### Claim 12 (depends on 11) A direct positive silver halide photographic light-sensitive material as in claim 11, wherein the substituent for the substituted alkyl group or the substituted cycloalkyl group is an alkoxy group, an alkoxycarbonyl group, an aryl group, an amido group or an acyloxy group. ### Claim 13 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein R.sup.3 is a hydrogen atom. ### Claim 14 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the divalent aromatic group represented by X is a phenylene group which may be substituted or a naphthylene group which may be substituted. ### Claim 15 (depends on 14) A direct positive silver halide photographic light-sensitive material as in claim 14, wherein the substituent for the substituted phenylene group or the substituted naphthylene group is an alkyl group having from 1 to 20 carbon atoms, an aralkyl group the alkyl moiety of which has from 1 to 3 carbon atoms, an alkoxy group which may be substituted, a mono- or di-substituted amino group which is substituted with one or two alkyl groups which may be substituted, an aliphatic acylamino group, an aromatic acylamino group, an alkylthio group, a hydroxy group, or a halogen atom. ### Claim 16 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein X is a phenylene group. ### Claim 17 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the compound is represented by formula (II) ##STR9## wherein R.sup.1 represents a hydrogen atom, an aliphatic group, an aromatic group or a heterocyclic group; and X represents a divalent aryl group. ### Claim 18 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the compound is incorporated in said light-sensitive internal latent image type silver halide emulsion layer. ### Claim 19 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the compound is incorporated into a hydrophilic colloid layer adjacent to said light-sensitive internal latent image type silver halide emulsion layer. ### Claim 20 (depends on 18) A direct positive silver halide photographic light-sensitive material as in claim 18, or 19, wherein the amount of the compound is in a range of from 0.1 mg to 5,000 mg per mol of silver halide in the light-sensitive internal latent image type silver halide emulsion. ### Claim 21 (depends on 18) A direct positive silver halide photographic light-sensitive material as in claim 18, or 19, wherein an amount of the compound is in a range of from 0.5 mg to 2000 mg per mol of silver halide in the light-sensitive internal latent image type silver halide emulsion. ### Claim 22 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the light-sensitive internal latent image type silver halide photographic emulsion is associated with a color image-forming coupler. ### Claim 23 (depends on 1) A direct positive silver halide photographic light-sensitive material as in claim 1, wherein the light-sensitive internal latent image type silver halide photographic emulsion is associated with a dye-image providing material for diffusion transfer. ### Claim 24 (depends on 23) A direct positive silver halide photographic light-sensitive material as in claim 23, wherein the dye-image providing material is a dye releasing redox compound. ### Claim 25 (depends on 23) A direct positive silver halide photographic light-sensitive material as in claim 23, wherein the dye-image providing material is a dye releasing redox compound having an o-hydroxyarylsulfamoyl group. ### Claim 26 A method of forming a direct positive image which comprises imagewise exposing a direct positive silver halide photographic light-sensitive material comprising a support having coated thereon at least one light-sensitive internal latent image type silver halide photographic emulsion layer, said silver halide photographic emulsion not being previously fogged wherein at least one layer of the light-sensitive internal latent image type silver halide photographic emulsion layers and other hydrophilic colloid layers contains a fogging amount of a compound represented by formula (I) ##STR10## wherein R.sup.1 and R.sup.2 can each represent a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group; R.sup.3 represents a hydrogen atom or an aliphatic group; R.sup.4 represents a hydrogen atom, an aliphatic group, or an aromatic group; and X represents a divalent aryl group, and developing with a developing agent.