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
  • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
  • G03C1/85—Photosensitive materials characterised by the base or auxiliary layers characterised by antistatic additives or coatings
• • 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
  • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
  • G03C1/85—Photosensitive materials characterised by the base or auxiliary layers characterised by antistatic additives or coatings
  • G03C1/89—Macromolecular substances therefor
  • G03C1/895—Polyalkylene oxides

Definitions

• the invention relates to photographic recording materials, preferably with silver halides as photosensitive components and hydrophilic colloids as binders, which have a reduced tendency to static charge.
• Photographic silver halide films generally consist of an electrically non-conductive support coated on one or both sides with a hydrophilic colloid.
• the light-sensitive silver halide is dispersed in the hydrophilic colloid on one or both sides.
• EP 01 70 529-A2 proposes hydrophilic Colloidal layer to add a surface-active polymer, which contains oxyalkyl units as a monomer, and a salt, which can be, for example, a perfluorocarboxylate or perfluorocarboxysulfonate.
• a surface-active polymer which contains oxyalkyl units as a monomer
• a salt which can be, for example, a perfluorocarboxylate or perfluorocarboxysulfonate.
• EP 02 42 853-A2 describes a photographic silver halide material which, in the outermost layer on the side carrying the silver halide emulsion, contains an organopolysiloxane and a nonionic wetting agent with a polyoxyethylene unit which is combined with or replaced by a fluorine-containing compound can contains. Such a combination does indeed give good surface conductivity and a faster breakdown of the charges generated by friction. The triboelectric charge is not avoided by such a combination.
• the invention has for its object to provide an antistatic photographic material which is free from the shortcomings described. This material is said to have a very low tendency to triboelectric charging compared to the prior art.
• the triboelectric charging of hydrophilic colloid layers which contain the combination of three surface-active compounds according to the invention is at least one order of magnitude lower than in the case of layers with three surface-active compounds according to the prior art. This shows that the antistatic effects of the compounds combined according to the invention do not simply add up, but that these compounds interact in a special, unexpected manner.
• the compounds of groups I to III according to the invention are used in amounts of 0.001 to 10 percent, based on the dry weight of the hydrophilic colloidal binder.
• the layer system on one side of the support consists of several partial layers, which either contain the light-sensitive silver halide emulsion or are non-light-sensitive auxiliary or protective layers. It is then possible to distribute the compounds according to groups I to III over several layers.
• the outer layer contains connections from all three groups.
• the compounds of groups I to III can be added to any of the coating solutions assigned to one side of the support. They can be mixed before addition or added separately from one another.
• hydrophilic colloids known to the person skilled in the art for use in photographic materials can be used as binders for the hydrophilic colloid layer, e.g. Gelatin, naturally occurring proteins, protein derivatives, cellulose derivatives, gelatin derivatives, e.g. acylated gelatin, polysaccharides such as dextran or acacia, synthetic polymers such as e.g. Polyvinyl alcohol, polyacrylamide, copolymers with acrylic acid and polyvinyl pyrrolidone. These binders can be temporarily or permanently crosslinked by adding hardening agents.
• binders can be temporarily or permanently crosslinked by adding hardening agents.
• the photographic materials according to the invention which contain the compounds according to groups I to III, show virtually no triboelectric charge after contact with the usual materials present in mechanical transport systems for films.
• the other photographic and application properties of the materials e.g. Sensitivity, fog, gradation, development speed and storage stability are not adversely affected by the use according to the invention of the compounds from groups I to III.
• the invention can be applied to photographic materials of all kinds.
• it can be used advantageously in films for medical diagnosis with X-rays, in films for reproduction technology and in films for imagewise photography and cinematography.
• it can also be used for non-light-sensitive flat products coated with hydrophilic colloids, for example drawing films.
• a medical X-ray film for use with reinforcing foils was produced by applying a silver halide gelatin emulsion layer and a gelatin protective layer on both sides of a 178 ⁇ m thick polyethylene terephthalate layer support provided on both sides with adhesive layers.
• 4.9 g / m2 of silver bromoiodide with 2 mol% iodide and 2.7 g / m2 of alkaline digested gelatin were applied to each side of the support and 1 g / m2 of the same gelatin were applied to the protective layer.
• the solutions also contained the usual additives for sensitization and stabilization, for hardening and for pH control.
• Four samples A, B, C and D were produced, which differed only in the content of compounds from groups I to III (see Table 1). After 1 week storage at room temperature, the triboelectric charge of the samples was measured as follows:
• a 15 x 20 cm2 film sheet is transported at a speed of 0.4 m / s in succession through 5 pairs of rollers, each made of a hard rubber and an anodized aluminum roller and then immediately transported to a measuring cage.
• the voltage which the measuring cage assumes against earth is measured and the capacitance of the measuring arrangement is used to infer the amount of charge taken up by the film.
• the measurements were carried out at 27 ° C and 37% relative humidity.
• Example 1 Four samples E, F, G and H of an X-ray medical film were prepared in the same manner as in Example 1. After storage for 1 week at room temperature, the triboelectric charging of the samples was determined as in Example 1:
• Table 2 The composition of the samples and the results of the measurement are summarized in Table 2.
• Table 1 sample A B C.
• D Group I compound - I-1 I-1 I-1 amount - 0.03 0.03 0.03 layer - emulsion emulsion emulsion Group II compound II-2 - II-2 II-2 amount 0.18 - 0.18 0.18 layer emulsion - emulsion emulsion Group III compound III-1 III-1 - III-1 amount 0.8 0.8 - 0.8 layer Protection- Protection- - Protection- Triboelectric charging (10 ⁇ 7c) 0.62 -0.31 -1.5 -0.03 annotation comparison comparison comparison comparison invention Amounts in percent by weight based on the hydrophilic colloid.

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

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Cited By (3)

Citations (3)

• 1988
  • 1988-12-07 EP EP88120443A patent/EP0319951A1/fr not_active Withdrawn

Patent Citations (3)

Non-Patent Citations (1)

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