EP0490297B1 - Matériaux photographiques à stabilité augmentée d'image latente - Google Patents

Matériaux photographiques à stabilité augmentée d'image latente Download PDF

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Publication number
EP0490297B1
EP0490297B1 EP19910120993 EP91120993A EP0490297B1 EP 0490297 B1 EP0490297 B1 EP 0490297B1 EP 19910120993 EP19910120993 EP 19910120993 EP 91120993 A EP91120993 A EP 91120993A EP 0490297 B1 EP0490297 B1 EP 0490297B1
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EP
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Prior art keywords
recording material
silver halide
photographic
latent image
carbon atoms
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EP19910120993
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German (de)
English (en)
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EP0490297A1 (fr
Inventor
George Lee c/o EASTMAN KODAK COMPANY Bonheyo
Ronald Edmund C/O Eastman Kodak Company Leone
Roger C/O Eastman Kodak Company Lok
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Eastman Kodak Co
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Eastman Kodak Co
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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

Definitions

  • the present invention relates to photographic recording materials and more particularly to photographic recording materials having enhanced latent image keeping stability.
  • a visible image is formed in silver halide photographic materials by exposure of the material to actinic radiation to form a record of the exposure. This record, which is invisible to the unaided eye, yields a visible image by photographic processing of the exposed material.
  • the latent image comprises minute specks of metallic silver. These specks form in or on individual silver halide grains by interaction between silver ions and photoelectrons generated by absorption of actinic radiation by the silver halide grains.
  • Processing of most common silver halide photographic materials includes a development step in which the material is contacted with an aqueous alkaline solution of a developing agent.
  • the developing agent which is a reducing agent, selectively reduces to metallic silver those silver halide grains containing a latent image.
  • latent image is not permanent and that, with passage of time, silver halide grains which would be developable immediately after exposure become nondevelopable. This phenomenon is termed latent image fading and manifests itself as a loss in image density in the developed image and a consequent loss in speed in the silver halide photographic material.
  • latent image fading would not be a problem.
  • delays between exposure and processing frequently occur.
  • latent image fading can present a significant problem and compounds are added to photographic materials to prevent or reduce this undesirable effect.
  • These compounds are referred to as latent image stabilizers and prevention or reduction of latent image fading is referred to as latent image stabilization.
  • a photographic recording material comprising a support and a photographic silver halide emulsion which has associated therewith a benzothiazolium or benzoselenazolium salt having the structural formula: wherein: X is sulfur or selenium; R1 is hydrogen, halogen, alkyl containing 1 to 5 carbon atoms, such as methyl, ethyl, propyl n-butyl, t-butyl or pentyl; or alkoxy containing 1 to 5 carbon atoms, such as methoxy, ethoxy, propoxy, n-butoxy, t-butoxy and R2 and R3 individually are hydrogen or alkyl containing 1 to 5 carbon atoms, such as methyl, ethyl, propyl, n-butyl, t-butyl or pentyl; Y is a counterbalancing ion; z is 1 or 2; m is 0 to 4; n is
  • R1 is alkyl or alkoxy
  • the length of the carbon chain is from 1 to 5 carbon atoms, preferably from 1 to about 3 carbon atoms.
  • the alkyl or alkoxy group can be straight or branched chain.
  • R1 is halogen it is preferably chloro.
  • the counterbalancing ion Y can be any anion compatible with the photographic material in which it is coated.
  • Useful ions include inorganic anions such as halides, halophosphates, trifluoromethanesulfonates and the like.
  • n can be an integer as high as 4, the preferred value is from 1 to 3.
  • the carbon chain can be straight or branched chain.
  • alkynyl benzothiazolium and benzoselenazolium compounds as described can be prepared by methods known in the organic compound synthesis art.
  • a typical method of preparation is as follows:
  • the benzothiazolium and benzoselenazolium compounds of this invention can be prepared by the route shown below.
  • Commercially available or synthesized alcohols (I) are commercially available or synthesized alcohols (I)
  • the benzothiazolium and benzoselenazolium salts described herein can be added to a silver halide emulsion at any point subsequent to precipitation of the silver halide grains.
  • the salts are added to an emulsion after chemical and spectral sensitization, but prior to coating.
  • the salts can be present during these sensitization procedures.
  • benzothiazolium or benzoselenazolium salt added to an emulsion will depend upon various factors such as the particular salt employed, the particular silver halide emulsion used or the nature of other components of the emulsion. Useful amounts are within the range of from about 0.002 to about 10 millimoles of salt per mole of silver. Preferably, the salt is incorporated in the emulsion in an amount of from about 0.02 to about 0.5 millimole per mole of silver.
  • the silver halide emulsions as described can be any of the silver halide emulsions known in the art which are desirably protected against latent image instability or fading.
  • the silver halide emulsions can be comprised of silver bromide, silver chloride, silver chlorobromide, silver chloroiodide, silver bromoiodide, silver chlorobromoiodide or mixtures thereof.
  • the emulsions can include coarse, medium or fine grains and can be monodisperse or polydisperse.
  • the silver halide emulsions are preferably surface latent image-forming emulsions. They can be chemically sensitized as illustrated by T. H. James, The Theory of the Photographic Process, 4th Ed., MacMillan, 1977, pp. 67-76, or with sulfur, selenium, tellurium, gold, platinum, palladium, iridium, osmium, rhenium or phosphorus sensitizers, or combinations of these sensitizers, as illustrated by Research Disclosure, Vol. 134, June 1975, Item 13452, or in U. S. Patent Nos.
  • Chemical sensitization can optionally be conducted in the presence of thiocyanate derivatives, as described in U. S. Patent Nos. 2,222,264 and 2,642,361; thioether compounds, as disclosed in U. S. Patent Nos. 2,521,926; 3,021,215 and 4,054,457; or azaindenes, azapyridazines and azapyrimidines, as described in U. S. Patent Nos. 3,411,914; 3,554,757; 3,565,631 and 3,901,714.
  • the emulsions can be reduction sensitized e.g., with hydrogen, as illustrated by U.S. Patent Nos.
  • the silver halide emulsions can be spectrally sensitized with dyes from a variety of classes, including the polymethine dye class, which includes the cyanines, merocyanines, complex cyanines and merocyanines (i.e., tri-, tetra-, and poly-nuclear cyanines and merocyanines), oxonols, hemioxonols, styryls, merostyryls and streptocyanines.
  • Particularly useful dyes are benzoxazole, benzimidazole and benzothiazole carbocyanine dyes.
  • the photographic silver halide emulsions can contain various colloids alone or in combination as vehicles. Suitable hydrophilic materials as well as hardeners therefore, are described in Research Disclosure, December 1989, Item 308119, Sections IX and X.
  • the photographic silver halide emulsions and elements employing the stabilizing agents of this invention can contain other addenda conventional in the photographic art.
  • Useful addenda are described, for example, in Research Disclosure, December 1989, Item 308119 and include antifoggants, couplers (such as dye forming couplers, masking couplers, DIR and DIAR couplers), anti-stain agents, image dye stabilizers, absorbing materials such as filter dyes and UV absorbers, light scattering materials, coating aids, plasticizers and lubricants.
  • the photographic recording materials described herein can be black-and-white or monochrome materials or they can be multilayer and/or multicolor elements comprising a support bearing one or more layers of a silver halide emulsion. These materials can be designed for processing in conventional developer solutions.
  • Multicolor elements can contain dye image forming units sensitive to each of the three primary regions of the spectrum. Each unit can be comprised of a single emulsion layer or of multiple emulsion layers sensitive to a given region of the spectrum.
  • the layers of the element, including the layers of the image-forming units, can be arranged in various orders as known in the art.
  • the emulsion or emulsions can be disposed as one or more segmented layers.
  • a preferred color photographic recording material comprises a support bearing at least one blue-sensitive silver halide emulsion layer having associated therewith a yellow dye-forming coupler, at least one green-sensitive silver halide emulsion layer having associated therewith a magenta dye-forming coupler and at least one red-sensitive silver halide emulsion layer having associated therewith a cyan dye-forming coupler, at least one of the silver halide emulsion layers containing a latent image stabilizing compound of this invention.
  • the stabilizing compound is contained in a yellow dye-forming blue-sensitive silver halide emulsion.
  • the photographic recording materials of the present invention can contain additional layers conventional in photographic elements, such as overcoat layers, spacer layers, filter layers, antihalation layers, scavenger layers and the like.
  • the support can be any suitable support used with photographic elements. Typical supports include polymeric films, paper (including polymer-coated paper), glass and the like. Details regarding supports and other layers of the photographic elements of this invention are contained in Research Disclosure, December 1989, Item 308119, referred to above.
  • the term "associated therewith” signifies that the stabilizing compound is in a silver halide emulsion layer or in an adjacent layer so that the materials contained therein are accessible to one another.
  • Benzothiazolium salts as latent image keeping agents were evaluated in a color negative test.
  • the Emulsion I used was a 1.6 micrometer equivalent circular diameter, .12 micrometer thick tabular silver bromoiodide emulsion containing 6 mol % iodide.
  • the emulsion was sulfur and gold sensitized with a yellow optical sensitizing dye.
  • This emulsion was coated in a two layer monochrome with a protective overcoat over the image layer.
  • the image layer contained the emulsion, a yellow dye forming coupler, and the latent image keeping agents coated both at .02 and .10 mmole/mole Ag.
  • the melt pH was 5.9 and the melt pAg was 7.9.
  • the latent image keeping coatings were exposed for 1/100 second and were incubated at 25°C, 50% RH for four weeks.
  • the check coatings were stored at -18°C and then were exposed. Both coatings were processed in a C-41 process with a commercial bleach (C-41 is a tradename and available from Eastman Kodak Company, U.S.A.). The processed coatings were read with status M densitometry. Results are reported in Table 1.
  • the compounds A, B and C are as follows:

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  • 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)
  • Plural Heterocyclic Compounds (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Claims (10)

  1. Produit d'enregistrement photographique comprenant un support et une émulsion d'halogénure d'argent photographique à laquelle est associé un sel de benzothiazolium ou de benzosélénazolium répondant à la formule:
    Figure imgb0026
     dans laquelle
       X est un atome de soufre ou de sélénium;
       R¹ est un atome d'hydrogène ou d'halogène ou un groupe alkyle en C₁-C₅ ou alcoxy en C₁-C₅;
       R² et R³ sont chacun un atome d'hydrogène ou un groupe alkyle en C₁-C₅;
       Y est un ion pour équilibrer la charge;
       z est égal à 1 ou 2;
       m est un nombre de 0 à 4;
       n est un nombre de 1 à 4; et,
       R⁴ est un groupe alkyle ou aryle, substitué ou non.
  2. Produit d'enregistrement selon la revendication 1, dans lequel R¹ est l'hydrogène.
  3. Produit d'enregistrement selon la revendication 1 ou 2, dans lequel R¹ est le chlore.
  4. Produit d'enregistrement selon l'une quelconque des revendications 1 à 3, dans lequel R¹ est un groupe alkyle ou alcoxy en C₁-C₅.
  5. Produit d'enregistrement selon l'une quelconque des revendications 1 à 4, dans lequel R⁴ est un groupe alkyle en C₁-C₃; R¹, R² et R³ sont des atomes d'hydrogène ; n est égal à 1 et z est égal à 1.
  6. Produit d'enregistrement selon l'une quelconque des revendications 1 à 5, dans lequel le sel est présent à raison de 0,002 à environ 10 mmole par mole d'argent.
  7. Produit d'enregistrement selon l'une quelconque des revendications 1 à 6, dans lequel le sel est présent à raison de 0,02 à 0,5 mmol par mole d'argent.
  8. Produit d'enregistrement selon l'une quelconque des revendications 1 à 7, qui est un produit pour la photographie en couleurs.
  9. Produit d'enregistrement selon l'une quelconque des revendications 1 à 8, dans lequel le sel répond à la formule:
    Figure imgb0027
  10. Produit d'enregistrement selon l'une quelconque des revendications 1 à 9, dans lequel l'émulsion d'halogénure d'argent photographique est une émulsion d'halogénure d'argent photographique à grains tabulaires.
EP19910120993 1990-12-10 1991-12-06 Matériaux photographiques à stabilité augmentée d'image latente Expired - Lifetime EP0490297B1 (fr)

Applications Claiming Priority (2)

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US62526390A 1990-12-10 1990-12-10
US625263 1990-12-10

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EP0490297A1 EP0490297A1 (fr) 1992-06-17
EP0490297B1 true EP0490297B1 (fr) 1993-09-29

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5814665B2 (ja) * 1975-12-09 1983-03-22 富士写真フイルム株式会社 チヨクセツポジハロゲンカギンカンコウザイリヨウ
US4375508A (en) * 1981-10-15 1983-03-01 Eastman Kodak Company Photographic compositions and elements spectrally sensitized with new methine dyes
EP0377889B1 (fr) * 1989-01-07 1994-05-18 Agfa-Gevaert AG Matériel d'enregistrement à l'halogénure d'argent

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DE69100442T2 (de) 1994-05-05
DE69100442D1 (de) 1993-11-04
JPH04269742A (ja) 1992-09-25
EP0490297A1 (fr) 1992-06-17

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