Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
  • G03C8/24—Photosensitive materials characterised by the image-receiving section
  • G03C8/243—Toners for the silver image
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
  • C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
  • C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D231/14—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D231/18—One oxygen or sulfur atom
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
  • C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
  • C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D231/14—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D231/18—One oxygen or sulfur atom
  • C07D231/20—One oxygen atom attached in position 3 or 5
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
  • C07D231/54—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings condensed with carbocyclic rings or ring systems
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/166—Toner containing

Definitions

• This invention relates to the production of positive photographic records by the method generally known as the diffusion transfer process.
• a latent image is formed in a photographic material having a gelatino silver halide lightsensitive layer, usually a silver chloride layer.
• the latent image is developed in the presence of a solvent for the silver halide and while the material is in face contact with a so-called reception sheet.
• the reception sheet is normally not itself light-sensitive, but it includes a surface layer containing a substance which will constitute nuclei for the photographic development process. When the layers are peeled apart the reception sheet is found to carry a positive record in developed silver of the original image.
• the result is obtained because some of the silver halide in the areas not carrying the latent image dissolves in the silver halide solvent or forms a complex therewith and diffuses into the reception sheet where, in association with the development nuclei present in that sheet and in the presence of the developing substance, it develops to form an image in that sheet.
• R and R are alkyl groups, preferahlylower alkyl groups such as methyl or ethyl, or together form a 5- membered or 6-membered saturated ring
• Xf is an alkyl, e.g. methyl or ethyl, aralkyl, e.g. benzyl, alkylthio,
• the aforesaid compound is the preferred compound for use in the diffusion-transfer process in accordance with' the present invention.
• 5-BENZYL-4:4-DIMEIHYL-3- MERCAPTOPYRAZOLENINE 5-benzyl-4:4 dimethylpyrazol-3-one was prepared from hydrazine and ethyl a:a-dimethyl-v-phenylacetoacetate (Blaise, Qompt. Rendus, 1901, 132, 480) and obtained from aqueous solution as colorless needles, M.Pt. 116- 118.
• 5-benzyl-4:4-dimethylpyrazol-3-one (8 g.) and fresh, powdered phosphorus pentasulphide (20 g.) and xylene (200 ml.) were heated under reflux for one hour.
• the xylene solution was poured on to ice (200 g.) and left for 16 hours.
• the aqueous suspension was extracted with benzene and the benzene solution was evaporated to dry- ,Water to 1 litre.
• any of the compounds of'the general formula given above can usefully be added to the developer employed in the diffusion transfer process in quantities of, for example, 0.02 g. to 0.5 g./litre. It can alternatively be included in the photographic emulsion itself, e.g. in a 'proportion of 0.0 1 g. to 0.5 g./litre of emulsion coated, or
• reception sheet it may be included in the reception sheet, e.g. in a proportion of Ol02 to 2 g./litre of the coating solution applied to the reception sheet.
• quantities of thecompound of the order indicated may be distributed as between the developer, emulsion and reception sheet, or any two of these.
• the photographic material or the reception sheet may be wetted with. a solution of the compound as a pre-treatment before being subjected to the developing process.
• Example 1 A reception sheet was coated with a 5% (w./ v.) solution of gelatin containing 0.025 g. of colloidal silver sulphide, 20 g. of sodium'thiosulphate and 0.2 g. of .3-mercapto-4z4:S-trimethylpyrazolenine per litre.
• a sil- G. Sodium sulphite (cryst.) 100 Hydroquinone l0 p-Methyl amino phenol hydrochlorideuu 2 NaOH 10 KBr The twolayers were pressed together and separated-after one minute. The reception layer carried a neutral-toned positive image.
• Example 2 A' silver chlorobromide emulsion coated onpaper was exposed and, together with a reception sheet of the type describedin Example 1 but not containing thepyrazolenine compound, was impregnated with a developer of the following composition:
• R R HSC/ ⁇ C-1X i1 .N wherein R and R taken separatelyrepresent alkyl groups and taken together represent a saturated ring containing at least 5 and at most 6 members in the ring, and X represents a group selected from theclass consisting of alkyl, aralkyl, alkylthio and alkoxy groups.
• a method for the production of photographic records from silver halide photographic emulsions by the diffusion transfer process which comprises developing a photographic silver halide emulsion layer while theemulsion layer is in face contact with a layer containing development nuclei, the development being effected in the presence of a solvent for silver halide and 3-mercapto- 4:4:5-trimethylpyrazolenine.
• a method for the production of-photographic records from silver halide photographic emulsions by the diffusion transfer process which comprises developing a photographic silver halide emulsion -layer while the emul- 4 4-diethyhS-methylpyrazolenine.
• a method for the production of photographic records from silver halidephotographic emulsions by the diffusion'transfer-process which comprises developing a photographic silver halide emulsion layer while the 'emulsion layer is in face contact with a layer containing development nuclei, the development being effected in the presence of a solvent-for silver halide and 4:5-dimethyl- 4aethyl-3gmercaptopyrazolenine.
• a method for the production of photographic records from silver halide photographic emulsions by the diffusion transfer process which comprises developing a photographic silver halide emulsion layer while the emulsion layer is in face contact with a layer containing development nuclei, the development being effected in th presence of a solvent for silver halide and 5-benzyl-4z4- dimethyl-3-mercaptopyrazolenine.
• a method for the production of photographic records from silver halide photograpliicemulsions by the diffusion transfer process which comprises developing a photographic silver halide emulsion layer while the emulsion layer is in face contact with a layer containing development nuclei, the development being efiected m the presence of a solvent for silver halide and 3-mercapto-5- methyl-4:4-cyclopentamethylenepyrazolenine.
• a method for the production of photographic records from silver halide photographic emulsions by the difiusion transfer process which comprises develop ing a photographic silver halide emulsion layer while the emulsion layer is in face contact with a layer containing development nuclei, the development being efiected in the presence of a solvent for silver halide and the emulsion containing 0.01 to 0.5 g./litre of emulsion coating of a compound of the general formula:
• a method for the production of photographic records from silver halide photographic emulsions by the diffusion transfer process which comprises developing a photographic silver halide emulsion layer while the emulsion layer is in face contact with a layer containing development nuclei, the development being effected in the presence of a solvent for silver halide and the developer containing 0.02 to 0.5 g./litre of a compound of the general formula:
• a method for the production of photographic records from silver halide photographic emulsions by the difiusion transfer process which comprises developing a photographic silver halide emulsion layer while the emulsion layer is in face contact with a layer containing development nuclei, the development being effected in the presence of a solvent for silver halide and the layer containing the development nuclei further containing 0.02 to 2 g./litre of the coating applied of a compound of the general formula:
• X represents a group selected from the class consisting of alkyl, aralkyl, alkylthio and alkoxy groups the said compound being present in a proportion of 0.01 to 0.5 g. per litre of emulsion coated.
• a photographic developer composition containing a silver halide solvent and 0.02 to 0.5 g. per litre of a compound of the general formula:
• An element for use in photography comprising a support carrying a layer which includes photographic development nuclei and a compound of the general formula:
• X represents a group selected from the class consisting of alkyl, aralkyl, alkylthio and alkoxy groups the said compound being present in a proportion of 0.02 .to 0.2 g. per litre of the coating solution applied to form said layer.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)
• Plural Heterocyclic Compounds (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (3)

Citations (1)

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• 0
  • NL NL245863D patent/NL245863A/xx unknown
  • NL NL123870D patent/NL123870C/xx active
• 1958
  • 1958-11-28 GB GB38548/58A patent/GB875644A/en not_active Expired
• 1959
  • 1959-11-23 US US854614A patent/US3004850A/en not_active Expired - Lifetime
  • 1959-11-27 FR FR811528A patent/FR1241614A/fr not_active Expired
  • 1959-11-27 DE DEI17304A patent/DE1111937B/de active Pending

Patent Citations (1)

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