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
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
  • G03C1/34—Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression
  • G03C1/346—Organic derivatives of bivalent sulfur, selenium or tellurium
• • 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
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
  • G03C1/34—Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression

Definitions

• This invention relates to the processing of silver halide photographic film material and in particular to the processing of photographic film material under conditions which tend to give rise to a high fog level in the processed material.
• antifoggant in silver halide photographic developing solutions because the actual development process tends to cause fog in the developed material.
• the usual antifoggant employed in developing solutions is a water-soluble bromide. However under certain conditions it is required to use a stronger antifoggant than bromide and for this purpose a number of organic antifoggants have been used.
• a process for the production of a photographic record which comprises developing photographic material having a gelatino silver halide emulsion containing a developable silver image in a silver halide developing solution in the presence of a compound of the general formula:
• R represents a hydrogen atom or an alkyl or substituted alkyl group, an aralkyl group, an aryl group, or a group SR where R represents a hydrogen atom or an alkyl or substituted alkyl group, at least one of R R R or R is a nitro group and the remainder are each selected from a hydrogen or a halogen atom, or an alkyl, aralkyl, alkoxy, monoor di-alkylamino, acylamino or a nitro group.
• the compounds of the above formula are present initially in the photographic material, most preferably in each silver halide emulsion layer. This is particularly the case when the photographic material is to be developed at an elevated temperature.
• An example of a photographic development process which employs an elevated temperature, Le. a temperature above 30 C. is the so-called rapid method of processing X-ray films.
• the rapid method comprises developing, washing and fixing the film material in solutions having an elevated temperature, usually 35 C. or above.
• the processing usually is carried out in a processing machine through which the photographic material is progressed by a roller system.
• a gelatin hardening agent such as glutaraldehyde
• the photographic material comprises a compound of the formula hereinbefore set forth, the fog level in the developed material is reduced.
• a process for the production of a photographic record which comprises developing a photographic material having a gelatino silver halide emulsion and containing a developable silver salt image at a temperature above 30 C. in a developing solution containing a gelatin hardening agent, the said photographic material containing in at least one emulsion layer or in a layer adjacent thereto a compound of the general formula hereinbefore defined.
• the preferred gelatin hardening agent for use in this process is glutaric dialdehyde (glutaraldehyde) or a compound which comprises glutaric dialdehyde such as a bisulphite addition compound thereof.
• the preferred amount of a compound of the above formula to be present in the emulsion of the photographic material for use in the process of the present invention is from 0.2 to 2 g. per gm. mole of silver halide present in the emulsion. It is preferred that a compound of the above formula is present in each emulsion layer of the photographic material. This is especially so in the case of X-ray film material wherein an emulsion layer is present on each side of the film support.
• the compounds of the above formula may however be present in a supercoat layer or in a sub-layer as long as this layer is adjacent to the emulsion layer.
• a sulphur and gold sensitised coarse-grained iodobromide emulsion of the type suitable for X-ray photography with intensifying screens was divided into two parts. To the first portion was added the usual coating aids and hardening agents. The second portion was treated similarly but in addition there was added the quantity specified in Table II (which follows) of the compound under test, dissolved in alcohol to form a 0.5% solution or dissolved in the requisite quantity of dilute sodium hydroxide solution. Each emulsion was coated on a flexible support in the conventional manner.
• the samples were processed in a conventional machine designed to process radiographs in a dry-to-dry time of 90 seconds: the development phase of this process was 25 seconds at 40 C.
• the developing solution used was a l-phenyl-3-pyrazolidone/hydroquinone based developing solution which comprised g./litre of glutaric dialdehyde.
• the Table II records the data of fog, speed at a developed silver density of 1.0 and the average contrast over the density range of 0.2 to 2.0 for the control emulsion with no antifoggant and for the test emulsions containing the cited quantity of antifoggant per gm. mole of silver halide (the densities specified are measured from the fog density level and the speed figures are relative log speeds).
• R represents a hydrogen atom or an alkyl group, an aralkyl group, an aryl group or a group SR where R represents a hydrogen atom or an alkyl group, at least one of R R R or R is a nitro group and the remainder are each selected from a hydrogen or a halogen atom, or an alkyl, aralkyl, alkoxy, monoor di-alkylamino, acylamino or a nitro group.
• a process for the production of a photographic record which comprises developing an imagewise exposed photographic material having a gelatino silver halide emulsion and containing a developable silver salt image at a temperature above 30 C., in a developing solution containing a gelatin hardening agent, the improvement wherein the said photographic material contains in at least one emulsion layer or in a layer adjacent thereto a compound of the formula:
• R represents a hydrogen atom or an alkyl group, an aralkyl group, an aryl group or a group SR where R represents a hydrogen atom or an alkyl group, at least one of R R R or R is a nitro group and the remainder are each selected from a hydrogen or a halogen atom, or an alkyl, aralkyl, alkoxy, monoor di-alkylamino, acylamino or a nitro group.
• gelatin hardening agent is glutaraldehyde or a compound which comprises glutaraldehyde.
• R is hydrogen, methyl, phenyl or SCH and R R are hydrogen, N0 or CH at least one or R R being N0
• 9663 FOREIGN PATENTS 960,675 6/ 1964 Great Britain 96-1O9 NORMAN G. TORCHIN, Primary Examiner M. F. KELLEY, Assistant Examiner U.S. Cl. X.R. 9695, 109

Landscapes

• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10338422

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (1)

• 1969
  • 1969-06-26 GB GB32426/69A patent/GB1244697A/en not_active Expired
• 1970
  • 1970-06-24 DE DE19702031253 patent/DE2031253A1/de active Pending
  • 1970-06-25 JP JP45054820A patent/JPS4927697B1/ja active Pending
  • 1970-06-26 US US50314A patent/US3677761A/en not_active Expired - Lifetime
  • 1970-06-26 BE BE752613D patent/BE752613A/fr unknown

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