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
• • 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
  • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor

Definitions

• This invention relates to a photographic material having incorporated therein compounds preventing the formation of small spots caused by the action of heavy metals and/ or compounds of heavy metals upon the light-sensitive layer and at the same time preventing a too high static charging of the photographic material.
• Particles of metal or metallic compounds are harmful particularly in the present environment because they are generally chemically reactive which means that they exert a secondary action upon the light-sensitive emulsion and can enlarge the defects which are caused by their presence directly and which would otherwise be for the most part invisible to the naked eye consequently, depending upon the nature of the particle and the kind of the emulsion applied, light and dark spots become visible after treating the exposed light-sensitive material in the usual photographic baths.
• Metallic particles in the photographic layers can 'react rather slowly and the corrosion products formed can diffuse away from the central nucleus. These corrosion products can have a sensitizing or a desensitizing action on the emulsion so that after the normal bath-treatment the photographic material shows black and white spots respectively.
• fine metal particles or dust consisting of metal compounds which are present in a non-light-sensitive adjacent layer have an equally disadvantageous influence on the superimposed or underlying light-sensitive layer.
• the harmful corrosion products of the metal particles or the dissolved ingredients of the metal com-pounds can readily reach by diffusion the light-sensitive layer to cause the above-mentioned faults.
• Salts of sulfosalicylic acid which are very well suited for use in a material according to the present invention are the monosalts especially the mono-alkali salts and the disalts for instance the di-alkali salts.
• Sulfosalicylic acid and/or soluble salts of sulfosalicylic acid are usually previously dissolved, for instance in water. If the compounds are to be incorporated into the support, said support may be dipped in the above solution. However, when the compounds are to be incorporated into a water-permeable layer or layers the above solution is mostly added to the coating composition of the layer or layers involved.
• the compounds employed according to the present invention may also be incorporated into a photographic material in combination with known compounds (cf. French patent specifications, Nos. 1,249,593, 1,249,594 and 1,288,867) used for preventing heavy metals, their corrosion products and their compounds from disadvantageously influencing the light-sensitive silver halide emulsion layer. With such a combination still bet ter results in preventing spot formation can be obtained.
• the compounds according to the present invention when incorporated into a photographic element show the advantage of not having any influence on the photographic characteristics aimed at such as e.g. contrast, sensitivity, stability and fog. Consequently they can be incorporated into high sensitivity, low sensitivity, high contrast, low contrast emulsions and into acid as well as into alkaline emulsions.
• a further advantage is that the compounds of use according to the invention are inert with respect to other emulsion additives such as eg dispersing agents, color couplers, surface active agents, optical bleaching agents, antioxidizing agents, sensitizers, anti-fogging agents, stabilizers, hardening agents and plasticizers.
• emulsion additives such as eg dispersing agents, color couplers, surface active agents, optical bleaching agents, antioxidizing agents, sensitizers, anti-fogging agents, stabilizers, hardening agents and plasticizers.
• the compounds according to this invention find versatile applications in any negative and positive material of the black-and-white and color photography such as cinefilm, X-ray film, light-sensitive silver halide emulsion materials used in processes for photomechanical printing and light-sensitive silver halide and non-ligh-t-sensitive transfer materials used for the manufacture of copies by means of the silver halide diffusion transfer process.
• Example 1 A first photographic material is manufactured as follows: Onto a support of cellulose triacetate a subbing layer is coated from a suspension of gelatin in organic solvents in such a way that 10 g. of solid substance is present per 30 sq. m. of photographic material. Thereupon a second gelatin layer is coated in such a way that 7.5 g. of gelatin is present per 35 sq. m. of photographic material. Finally a silver bromoiodide X-ray emulsion is coated. Onto said silver bromoiodide emulsion layer finely divided corrosion particles of the casting material are scattered whereupon another thin gelatin covering layer is applied.
• a second photographic material is manufactured in the same way as the first with the difference, however, that to the coating composition from which the second gelatin layer is coated 80 cc. of a 10% aqueous solution of the mono-sodium salt of sulfosalicylic acid is added per litre.
• a third photographic material is manufactured in the same way as the second using, however, a double amount of said 10% solution of the mono-sodium salt of sulfosalicylic acid.
• the three materials are developed in a developing bath of the following composition:
• Example 2 Three light-sensitive materials are manufactured in an analogous way as in Example 1 with the dilference, however, that in the manufacture of the second and third material the aqueous solutions of the sodium salt of sulfosalicylic acid are added to the coating compositions from which the light-sensitive silver halide emulsions are coated.
• the surface resistivity of said materials are measured at 20 C. and a relative humidity of 50% by means of two electrodes having a length of cm. and placed on the emulsion side of the photographic material at a distance of 1 cm. from each other.
• the resistivitiy of the material without sulfosalicylate is more than 10 ohm whereas the resistivity of the materials containing sulfosalicylate is about 10 ohm.
• the black spots equivalent results are obtained as with the materials of Example 1.
• Photographic light-sensitive material comprising a support, at least one light-sensitive silver halide emulsion layer and in effective contact with said emulsion layer a member selected from the group consisting of sulfosalicylic acid and at least one Water-soluble salt of sulfosalicylic acid.
• Photographic light-sensitive material comprising a support, at least one light-sensitive silver halide emulsion layer and a member selected from the group consisting of sulfosalicylic acid and at least one water-soluble salt of sulfosalicylic acid, said member being present in the light-sensitive silver halide emulsion layer.
• Photographic light-sensitive material comprising a support, at least one light-sensitive silver halide emulsion layer and a member selected from the group consisting of sulfosalicylic acid and at least one water-soluble salt of sulfosalicylic acid, said member being present in at least one water-permeable layer coated at the same side of the support as the light-sensitive silver halide emulsion layer.
• Photographic light-sensitive material comprising a support, at least one light-sensitive silver halide emulsion layer and in effective contact with said emulsion layer a No references cited.

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

Applications Claiming Priority (1)

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Country Status (4)

Cited By (4)

• 0
  • GB GB1053092D patent/GB1053092A/en active Active
  • BE BE622859D patent/BE622859A/xx unknown
• 1962
  • 1962-10-30 DE DEG36261A patent/DE1148445B/de active Pending
• 1963
  • 1963-09-16 US US309281A patent/US3300312A/en not_active Expired - Lifetime

Non-Patent Citations (1)

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