EP0066341B1 - Lichtempfindliches Element und photografisches Verfahren - Google Patents

Lichtempfindliches Element und photografisches Verfahren Download PDF

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Publication number
EP0066341B1
EP0066341B1 EP82200641A EP82200641A EP0066341B1 EP 0066341 B1 EP0066341 B1 EP 0066341B1 EP 82200641 A EP82200641 A EP 82200641A EP 82200641 A EP82200641 A EP 82200641A EP 0066341 B1 EP0066341 B1 EP 0066341B1
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EP
European Patent Office
Prior art keywords
layer
image
silver halide
halide emulsion
dye
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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EP82200641A
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English (en)
French (fr)
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EP0066341A3 (en
EP0066341A2 (de
Inventor
Peter O. Kliem
Richard Waack
Peter H. Roth
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Polaroid Corp
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Polaroid Corp
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Publication of EP0066341A3 publication Critical patent/EP0066341A3/en
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    • 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
    • G03C1/7614—Cover layers; Backing layers; Base or auxiliary layers characterised by means for lubricating, for rendering anti-abrasive or for preventing adhesion
    • 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
    • G03C8/42—Structural details
    • G03C8/52—Bases or auxiliary layers; Substances therefor

Definitions

  • This invention relates to photography and, more particularly, to diffusion transfer photography.
  • a photosensitive element containing a dye developer and a silver halide emulsion is photoexposed and a processing composition applied thereof, for example, by immersion, coating, spraying, flowing, etc., in the dark.
  • the exposed photosensitive element superposed prior to, during, or after the processing composition is applied, on a sheet-like support element which may be utilized as an image-receiving element.
  • the processing composition is applied to the exposed photosensitive element in a substantially uniform layer as the photosensitive element is brought into superposed relationship with the image-receiving layer.
  • the processing composition positioned intermediate the photosensitive element and the image-receiving layer, permeates the emulsion to initiate development of the latent image contained therein.
  • the dye developer is immobilized or precipitated in exposed areas as a consequence of the development.
  • unexposed and partially exposed areas of the emulsion the dye developer is unreacted and diffusible and thus provides an imagewise distribution of unoxidized dye developer, diffusible in the processing composition, as a function of the point-to-point degree of exposure of the silver halide emulsion. At least part of this imagewise distribution of unoxidized dye developer is transferred, by imbibition, to a superposed image-receiving layer or element, said transfer substantially excluding oxidized dye developer.
  • the image-receiving layer receives a depthwise diffusion, from the developed emulsion, of unoxidized dye developer without appreciably disturbing the imagewise distribution thereof to provide a reversed or positive color image of the developed image.
  • the image-receiving element may contain agents adapted to mordant or otherwise fix the diffused, unoxidized dye developer.
  • the desired positive image is revealed by separating the image-receiving layer from the photosensitive element at the end of a suitable imbibition period.
  • the image-receiving layer need not be separated from its superposed contact with the photosensitive element, subsequent to transfer image formation, if the support for the image-receiving layer, as well as any other layers intermediate said support and image-receiving layer, is transparent and a processing composition containing a substance, e.g., a white pigment, effective to mask the developed silver halide emulsion or emulsions is applied between the image-receiving layer and said silver halide emulsion or emulsions.
  • a processing composition containing a substance, e.g., a white pigment effective to mask the developed silver halide emulsion or emulsions is applied between the image-receiving layer and said silver halide emulsion or emulsions.
  • Dye developers are compounds which contain, in the same molecule, both the chromophoric system of a dye and also a silver halide developing function.
  • a silver halide developing function is meant a grouping adapted to develop exposed silver halide.
  • a preferred silver halide development function is a hydroquinonyt group.
  • the development function includes a benzenoid developing function, that is, an aromatic developing group which forms quinonoid or quinone substances when oxidized.
  • Multicolor images may be obtained using dye developers in diffusion transfer processes by several techniques.
  • One such technique contemplates obtaining multicolor transfer images utilizing dye developers by employment of an integral multilayer photosensitive element, such as is disclosed in the aforementioned U.S. Patent No. 2,983,606 and in U.S. Patent No. 3,345,163 issued October 3,1967 to Edwin H. Land and Howard G. Rogers, wherein at least two selectively sensitized photosensitive strata, superposed on a single support, are processed, simultaneously and without separation, with a single common image-receiving layer.
  • a suitable arrangement of this type comprises a support carrying a red-sensitive silver halide emulsion stratum, a green-sensitive silver halide emulsion stratum and a blue-sensitive silver halide emulsion stratum, said emulsions having associated therewith, respectively, for example, a cyan dye developer, a magenta dye developer and a yellow dye developer.
  • the dye developer may be utilized in the silver halide emulsion stratum, for example in the form of particles, or it may be disposed in a stratum behind the appropriate silver halide emulsion strata.
  • Each set of silver halide emulsion and associated dye developer strata may be separated from other sets by suitable interlayers, for example, by a layer or stratum of gelatin or polyvinyl alcohol.
  • suitable interlayers for example, by a layer or stratum of gelatin or polyvinyl alcohol.
  • a yellow dye developer of the appropriate spectral characteristics and present in a state capable of functioning as a yellow filter may be so employed and a separate yellow filter omitted.
  • the light-reflecting material (referred to in said patent as an "opacifying agent”) is preferably titanium dioxide, and it also performs an opacifying function, i.e., it is effective to mask the developed silver halide emulsions so that the transfer image may be viewed without interference therefrom, and it also acts to protect the photoexposed silver halide emulsions from post-exposure fogging by light passing through said transparent layer if the photoexposed film unit is removed from the camera before image-formation is completed.
  • an opacifying agent is preferably titanium dioxide, and it also performs an opacifying function, i.e., it is effective to mask the developed silver halide emulsions so that the transfer image may be viewed without interference therefrom, and it also acts to protect the photoexposed silver halide emulsions from post-exposure fogging by light passing through said transparent layer if the photoexposed film unit is removed from the camera before image-formation is completed.
  • U.S. Patent No. 3,647,437 issued March 7,1972 to Edwin H. Land, is concerned with improvements in products and processes disclosed in said U.S. Patent No. 3,415,644, and discloses the provision of light-absorbing materials to permit such processes to be performed, outside of the camera in which photoexposure is effected, under much more intense ambient light conditions.
  • a light-absorbing material or reagent preferably a pH-sensitive phthalein dye, is provided so positioned and/or constituted as not to interfere with photoexposure but so positioned between the photoexposed silver halide emulsions and the transparent support during processing after photoexposure as to absorb light which otherwise might fog the photoexposed emulsions.
  • the light-absorbing material is so positioned and/or constituted after processing as not to interfere with viewing the desired image shortly after said image has been formed.
  • the light-absorbing material also sometimes referred to as an optical filter agent, is initially contained in the processing composition together with a light-reflecting material, e.g., titanium dioxide.
  • the concentration of the light-absorbing dye is selected to provide the light transmission opacity required to perform the particular process under the selected light conditions.
  • the light-absorbing dye is highly colored at the pH of the processing composition, e.g., 13-14, but is substantially non-absorbing of visible light at a lower pH, e.g., less than 10-12.
  • This pH reduction may be effected by an acid-reacting reagent appropriately positioned in the film unit, e.g., in a layer between the transparent support and the image-receiving layer.
  • U.S. Patent No. 3,594,165 issued July 20, 1971 to Howard G. Rogers discloses photographic products and processes wherein the image-receiving layer is part of the photosensitive element, and this element is maintained in fixed relationship with a transparent cover sheet prior to exposure, and this relationship is maintained as a laminate after processing and image formation. In these products, the final image is viewed through the transparent support for the photosensitive element, photoexposure being effected through the transparent cover sheet.
  • the photosensitive element includes an opaque layer between the image-receiving layer (positioned adjacent the transparent support) and the photosensitive layers, and the processing composition includes an opacifying material, preferably carbon black, so that the exposed film unit may be processed in ambient light.
  • the image-forming material may be initially diffusible or initially non-diffusible and it may be an image dye or an image dye intermediate.
  • Canadian Patent No. 668,592 issued August 13, 1963 discloses the incorporation of a light-reflecting layer (titanium dioxide in gelatin) between a silver halide emulsion layer and the associated layer of image dye-providing material, e.g., a dye developer, to effectively increase the speed of the silver halide layer.
  • a light-reflecting layer titanium dioxide in gelatin
  • image dye-providing material e.g., a dye developer
  • a spacer layer is provided between a silver halide emulsion layer and its associated, underlying layer of image dye-providing material, the spacer layer comprising a light-reflecting pigment dispersed in inert polymeric particles which are substantially non-swelling in alkali and substantially non-film-forming.
  • the light-reflecting pigment may be any pigment which is photographically inert in the particular photographic process and which exhibits the desired reflectively for the silver halide emulsion with which it is to be associated.
  • the preferred light-reflecting pigment is titanium dioxide.
  • the pigment particle size most suitable for any particular application may be determined by routine experimentation. In the preferred embodiments of this invention the titanium dioxide has a particle size of about 0,2 pm.
  • the inert, non-swelling polymeric particles are provided as a non-coalescing latex to provide minimum inhibition of diffusing reagents.
  • the polymer may have an index of refraction which is higher, lower or about the same as that of gelatin but the index should be less than that of the light-reflecting pigment, thereby increasing the reflectivity of a given coverage of the pigment.
  • Suitable polymers include polymethylmethacrylate, polystyrene and polytetrafluoroethylene.
  • the spacer layer may include a minor portion of another polymer, such as gelatin or polyacrylamide, to provide a binder for the pigment and inert polymeric particles, and to provide additional flexibility to the spacer layer.
  • another polymer such as gelatin or polyacrylamide
  • the Figure illustrates in diagrammatic cross-section a film unit embodying the present invention, and adapted for use as an integral film unit of the type described in the above-mentioned U.S. Patent No. 3,415,644.
  • a photosensitive element 60 is positioned in superposed relationship with a transparent image-receiving element 70 through which photoexposure of the photosensitive element is to be effected.
  • a rupturable pod 50 Positioned between the photosensitive and image-receiving elements 60 and 70 is a rupturable pod 50 releasably holding a processing composition 52.
  • the photosensitive element 60 comprises an opaque support 10, a neutralizing layer 12 of a polymeric acid, a layer 14 adapted to "time" the availability of the polymeric acid by preventing diffusion of the processing compositon thereto for a predetermined time, a cyan dye developer layer 16, a spacer layer 18 in accordance with this invention, a red-sensitive silver halide emulsion layer 20, an interlayer 22, a magenta dye developer layer 24, a green-sensitive silver halide emulsion layer 26, an interlayer 28, a yellow dye developer layer 30, a blue-sensitive silver halide emulsion layer 32, and a top coat 36.
  • the top coat serves as an anti-abrasion layer and also may carry a component of the photographic system, e.g., an auxiliary developing agent, an ultraviolet light absorber, etc., as iswell known in the art.
  • the image-receiving layer70 comprises a transparent support 40 and an image-receiving layer 42. Photoexposure of the silver halide emulsion layer is effected through the transparent support 40 and the layers carried thereon also are transparent, the film unit being so positioned within the camera that light admitted through the camera exposure or lens system is incident upon the outer or exposure surface of the transparent support 40.
  • the opaque processing composition contains a film-forming polymer, a white pigment and has an initial pH at which the optical filter agents contained therein are colored; the optical filter agents are selected to exhibit the appropriate light absorption, i.e., optical density, over the wavelength range of light actinic to the particular silver halide emulsions.
  • Permeation of the alkaline processing composition through the timing layer 14 to the neutralilzing (polymeric acid) layer 12 is so controlled thatthe process pH is maintained at a high enough level to effect the requisite development and image transfer and to retain the optical filter agents in colored form within the processing composition layer and on the silver halide emulsion side of said layer,-after which pH reduction effected as a result of alkali permeation into the polymeric acid layer 12 is effective to reduce the pH to a level which changes the optical filter agents to a colorless form.
  • Absorption of the water from the applied layer of the processing composition results in a solidified film composed of the film-forming polymer and the white pigment dispersed therein, thus providing a light-reflecting layer which also serves to laminate together the photosensitive component 60 and the image-receiving component 70 to provide the final integral image.
  • the positive transfer image in dye developer present in the image-receiving layer 42 is viewed through the transparent support 40 against the light-reflecting layerwhich provides an essentially white background for the dye image and also effectively masks from view the developed photosensitive element 60.
  • the spacer layer 18 in accordance with this invention comprises a light-reflecting pigment, e.g., titanium dioxide, dispersed in inert, substantially non-swelling and non-film forming, polymeric particles, e.g., an uncoalesced polymethylmethacrylate latex.
  • a light-reflecting pigment e.g., titanium dioxide
  • inert substantially non-swelling and non-film forming, polymeric particles, e.g., an uncoalesced polymethylmethacrylate latex.
  • polymeric particles e.g., an uncoalesced polymethylmethacrylate latex.
  • the amount of light reflected by the spacer layer 18 may be adjusted in accordance with the needs of the particular photographic film by increasing or decreasing the coverage of the light-reflecting pigment.
  • the light-reflecting pigment-containing spacer layer is shown between the cyan dye developer layer and the red-sensitive silver halide emulsion layer. It will be understood that such spacer layers 18 also may be positioned between the magenta dye developer layer 24 and the green-sensitive silver halide emulsion layer 26, between the yellow dye developer layer 30 and the blue-sensitive silver halide emulsion layer 32, or in any combination of these three locations.
  • the light-reflecting pigment-containing spacer layer is so positioned thatthere is another silver halide emulsion behind it, as in the two positions not illustrated but noted above, it will be understood that the coverage of the light- reflecting pigment may be reduced and the speed of the underlying silver halide emulsion(s) may be increased to adjust for any light loss and thus obtain proper exposure of the underlying silver halide emulsion(s).
  • the optical filter agent is retained within the final film unit laminate and is preferably colorless in its final form, i.e., exhibiting no visible absorption to degrade the transfer image or the white background therefor provided by the reflecting layer.
  • the optical filter agent may be retained in the reflecting layer under these conditions, and it may contain a suitable "anchor” or "ballast” group to prevent its diffusion into adjacent layers.
  • Some of the optical filter agent may diffuse into the photosensitive component and be mordanted by the gelatin or other material present on the silver halide emulsion side of the reflecting layer; optical filter mordanted in the photosensitive component 60 may be colorless or colored in its final state so long as any color exhibited by it is effectively masked by the reflecting layer.
  • the optical filter agents are pH-sensitive phthalein dyes.
  • the concentration of optical filter agent is selected to provide the optical transmission density required, in combination with other layers intermediate the silver halide emulsion layers and the incident radiation, to prevent nonimagewise exposure, i.e., fogging, by incident actinic light during the performance of the particular photographic process.
  • the transmission density and the optical filter agent concentration necessary to provide the requisite protection from incident light may be readily determined for any photographic process by routine experimentation, as a function of film speed or sensitivity, processing time, anticipated incident light intensity, etc., as described in said U.S. Patent No. 3,647,437. It will be recognized that a particular transmission density may not be required for all portions of the spectrum, lesser density being sufficient in wavelength regions corresponding to lesser sensitivities of the particular photosensitive material.
  • the optical filter agent is a light absorbing dye which is highly colored at the pH of the processing composition, e.g., 13-14, but is substantially non-absorbing of visible light at a lower pH, e.g., less than 10-12.
  • Particularly suitable are phthalein dyes having a pKa of about 13 to 13.5; many such dyes are described in the aforementioned U.S. Patent No. 3,647,437.
  • This pH reduction may be effected by an acid-reacting reagent appropriately positioned in the film unit, e.g., in a layer of the photosensitive element as shown in the Figure or in a layer between the transparent support and the image-receiving layer or in other positions as known in the art.
  • a mixture of light-absorbing materials may be used so as to obtain absorption in all critical areas of the visible and near-visible by which the silver halide emulsions being used are exposable.
  • Many dyes which change from colored to colorless as a function of pH reduction, e.g., phthalein dyes, are known (see, for example, the aforementioned U.S. Patent No. 3,647,437) and appropriate selection may be made by one skilled in the art to meet the particular conditions of a given process and film unit.
  • a reactor was charged with 102 I of demineralized water and the Dowfax 2A1 and heated under nitrogen to 83°C whereupon 7,65 kg of methylmethacrylate was added and mixed until the temperature returned to 83°C. After 5 min. at 83°C, 4,93 kg of initiator solution (0,15 kg of potassium perfulsate and 14,79 kg water) was added. After the exotherm the temperature was reduced to 85°C and the remaining methylmethacrylate was added at a rate of about 361 g/min. and the remaining initiator solution at a rate of about 111 g/min. At the end of the monomer and initiator solution, the temperature was maintained at 85°C for 10 min. and then the ascorbic acid was added. The resulting latex had a 30% solids and about a 0,125 pm average particle size.
  • the use of the inert polymeric particles permits the use of lower coverages of the light-reflecting pigment to achieve a given reflection of light incident on the pigment-containing layer.
  • a white light reflection density of about 1,0 may be obtained from a titanium dioxide coverage of about 1000 mg/m 2 by the use of a coating comprising, by weight, 8 parts titanium dioxide, 1 part gelatin and 3 parts polymethylmethacrylate.
  • About 4000 mg/m 2 of titanium dioxide was found to be needed to give the same white reflection density when coated using an 8:1 by weight ratio of titanium dioxide and gelatin. (The white reflection density was measured of the described titanium dioxide layers coated on opaque polyethylene terephthalate having a neutral density of 1,62.)
  • the present invention provides the ability to use less silver halide to obtain a given film speed. This in turn may reduce the concentrations needed of other components of the system.
  • a photosensitive element was prepared by coating, on a polyethylene glycol terephthalate base, the following layers:
  • the thus-prepared photosensitive element was exposed and then processed by spreading a layer of alkaline processing composition approximately 0,076 mm thick between it and a superposed image-receiving element prepared by coating a transparent subcoated polyethylene terephthalate 0,1 mm support with the following layers:
  • the polymethylmethacrylate latex employed in the spacer layers of the above example had an average particle size of about 0.12 pm.
  • the titanium dioxide had a particle size of about 0,2 itm.
  • the processing composition should include a viscosity-increasing polymer of the type which, when the composition is spread and dried, forms a relatively firm and stable film.
  • a viscosity-increasing polymer of the type which, when the composition is spread and dried, forms a relatively firm and stable film.
  • High molecular weight polymers are preferred, and include cellulosic polymers such as sodium carboxymethyl cellulose, hydroxyethyl cellulose and hydroxyethyl carboxymethyl cellulose.
  • Another class of useful viscosity-increasing polymers comprises the oxime polymers disclosed and claimed in U.S. Patent No. 4,202,694 issued May 13, 1980 to Lloyd D. Taylor.
  • Suitable oxime polymers include polydiacetone acrylamide oxime as well as copolymers, e.g., oximated poly diacetone acrylamide/acrylic acid, and oximdated graft copolymers, e.g., grafts of diacetone acrylamide oxime onto hydroxyethyl cellulose.
  • the preferred concentration of such oxime polymers is about 1% by weight or less, e.g., about 0.8% by weight as in the above example.
  • the neutralising layer 12 and timing layer 14 may be coated in the photosensitive element between the opaque support 10 and the cyan dye developer layer 16, as described in U.S. Patent No. 3,537,043 issued March 30,1971 to Edwin H. Land or between the transparent support 40 and the image-receiving layer 42, as described in the above-mentioned U.S. Patent No. 3,415,644.
  • Other techniques for controlling the pH known in the art also may be used.
  • the positive component 60 and the negative component 70 shown in the Figure may be secured to each other along their marginal edges as described in U.S. Patent No. 3,415,644. They may be temporarily laminated to each other by a bond of such a nature that these elements may be readily separated by the distribution of the processing composition following rupture of the pod 50.
  • a particularly useful method of providing such a temporary lamination is to apply an aqueous solution of a polyethylene glycol, e.g., a polyethylene glycol having a molecular weight of about 6000 such as that commercially available under the tradename "Carbowax 6000" from Union Carbide Corporation.
  • a polyethylene glycol e.g., a polyethylene glycol having a molecular weight of about 6000 such as that commercially available under the tradename "Carbowax 6000" from Union Carbide Corporation.
  • Such uses of polyethylene glycols are disclosed in U.S. Patent No. 3,793,023 issued February 19, 1974 to Edwin H. Land and to which reference may be
  • Neutralizing layers such as the polymeric acid layer are well known in the art and are described in detail, for example, in the above-noted U.S. Patent Nos. 3,415,644, 3,573,043 and 3,647,437 to which patents reference may be made.
  • Dye developers are preferred image-providing substances, as indicated above, and constitute an example of initially diffusible dye image-providing substances.
  • Other useful dye image-providing substances include initially diffusible dyes useful as image dyes per se and which couple with the oxidation product of a silver halide developing agent to provide a non-diffusible product, initially diffusible color couplers which couple with the oxidation product of a silver halide developing agent to provide image dyes, initially non-diffusible compounds which react with the oxidation product of a silver halide developing agent, as by coupling or by cross-oxidation, to release a diffusible dye useful as an image dye per se.
  • the final image may be formed as a result of the diffusion transfer of a soluble complex of undeveloped silver halide, in which event the image may be in silver as is well known.
  • a soluble silver complex formed from undeveloped silver halide may be used to effect a cleavage reaction and release a dye or dye intermediate for transfer. Since these image-forming processes are well known and form no part per se of the present invention, it is not necessary to describe them in detail herein.
  • the transfer image may be positive or negative, with respect to the photographed subject matter, as a function of the particular image-forming system employed.
  • the silver halide emulsion may be negative-working or positive-working (e.g., internal latent image) as appropriate for the particular imaging system.

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Claims (38)

1. Lichtempfindliches Element, enthaltend eine Unterlage, die in der angegebenen Reihenfolge eine Schicht aus einer Silberhalogenidemulsion, eine Abstandsschicht und eine Schicht eines bilderzeugenden Materials trägt, wobei die Abstandsschicht ein das Licht reflektierendes Pigment enthält, dadurch gekennzeichnet, daß das Pigment in inerten polymeren Teilchen dispergiert ist, die in Alkali im wesentlichen unquellbar sind und die im wesentlichen keine Filme bilden.
2. Lichtempfindliches Element nach Anspruch 1, worin die Unterlage opak ist und die Schicht aus bilderzeugendem Material der Unterlage am nächsten ist.
3. Lichtempfindliches Element nach Anspruch 1, worin die Unterlage durchsichtig ist und die Silberhalogenid-Emulsionsschicht der Unterlage am nächsten ist.
4. Lichtempfindliches Element nach Anspruch 1, worin das bilderzeugende Material ein Bildfarbstoff oder ein Bildfarbstoff-Zwischenprodukt ist.
5. Lichtempfindliches Element nach Anspruch 4, worin das bilderzeugende Material ein Entwicklerfarbstoff ist.
6. Lichtempfindliches Element nach Anspruch 4, worin das bilderzeugende Material gefärbt ist.
7. Lichtempfindliches Element nach Anspruch 1, worin das das Licht reflektierende Pigment Titandioxid ist.
8. Lichtempfindliches Element nach Anspruch 1, worin die inerten polymeren Teilchen aus einer Polymer-Latex stammen.
9. Lichtempfindliches Element nach Anspruch 8, worin das Polymer Polymethylmethacrylat ist.
10. Lichtempfindliches Element nach Anspruch 8, worin das Polymer Polystyrol ist.
11. Lichtempfindliches Element nach Anspruch 8, worin die Latexteilchen einen Durchmesser von etwa 0,1 µm haben.
12. Lichtempfindliches Element nach Anspruch 1, worin die Abstandsschicht einen kleineren Gewichtsanteil eines film-bildenden Polymers enthält.
13. Lichtempfindliches Element nach Anspruch 1, worin das das Licht reflektierende Pigment in der Abstandsschicht in einer Gewichtsmenge vorhanden ist, die größer ist als die der inerten polymeren Teilchen.
14. Mehrfarbiges lichtempfindliches Element, enthaltend einen Träger, der in der angegebenen Reihenfolge eine Schicht eines blaugrünen bildfarbstoffliefernden Materials, eine Schicht einer rotempfindlichen Silberhalogenidemulsion, eine Zwischenschicht, eine Schicht eines purpurnen bildfarbstoffliefernden Materials, eine Schicht einer grünempfindlichen Silberhalogenidemulsion, eine Zwischenschicht, eine Schicht eines gelben bildfarbstoffliefernden Materials und eine Schicht einer blauempfindlichen Silberhalogenidemulsion trägt, wobei mindestens eine der Silberhalogenid-Emulsionsschichten und die ihr zugeordnete Schicht des bildfarbstoffliefernden Materials durch eine Abstandsschicht getrennt sind, welche ein das Licht reflektierendes Element enthält, dadurch gekennzeichnet, daß das Pigment in inerten polymeren Teilchen dispergiert ist, die in Alkali im wesentlichen unquellbar sind und die im wesentlichen keine Filme bilden.
15. Mehrfarbiges.lichtempfindliches Element nach Anspruch 14, worin die Abstandsschicht zwischen der Schicht des blaugrünen bildfarbstoffliefernden Materials und der rotempfindlichen Silberhalogenid-Emulsionsshicht angeordnet ist.
16. Mehrfarbiges lichtempfindliches Element nach Anspruch 14, worin die Abstandsschicht zwischen der Schicht des purpurnen bildfarbstoffliefernden Materials und der grünempfindlichen Silberhalogenid-Emulsionsschicht angeordnet ist.
17. Mehrfarbiges lichtempfindliches Element nach Anspruch 14, worin die Abstandsschicht zwischen dem gelben bildfarbstoffliefernden Material und der blauempfindlichen Silberhalogenid-Emulsionsschicht angeordnet ist.
18. Mehrfarbiges lichtempfindliches Element nach Anspruch 14, worin jedes bildfarbstoffliefernde Material ein Entwicklerfarbstoff ist.
19. Mehrfarbiges lichtempfindliches Element nach Anspruch 14, worin das das Licht reflektierende Pigment Titandioxid ist.
20. Photographisches Verfahren, bei dem ein erstes folienartiges Element, enthaltend eine Unterlage, die eine Silberhalogenidemülsion trägt, der ein bilderzeugendes Material in einer Schicht hinter der Silberhalogenidemulsion zugeordnet ist, belichtet wird; eine Schicht einer viskosen wäßrig-alkalischen Entwicklermasse zwischen dem ersten folienartigen Element und einem zweiten folienartigen Element, das eine durchsichtige Unterlage darstellt, erzeugt wird; wobei eine Bildempfangsschicht in einem der folienartigen Elemente vorhanden ist; wobei das Aufbringen der Entwicklermasse bewirkt, daß die belichtete Silberhalogenidemulsion entwickelt und in der Bildempfangsschicht ein sichtbares Bild erzeugt wird; und wobei die Silberhalogenid-Emulsionsschicht von der Schicht des bilderzeugenden Materials durch eine Abstandsschicht getrennt ist, die ein das Licht reflektierendes Pigment enthält, dadurch gekennzeichnet, daß das Pigment in inerten polymeren Teilchen dispergiert ist, die im wesentlichen in Alkali unquellbar sind und die im wesentlichen keine Filme bilden.
21. Photographisches Verfahren nach Anspruch 20, worin das erste folienartige Element ein mehrfarbiges lichtempfindliches Element darstellt, das eine Unterlage enthält, welche in der angegebenen Reihenfolge eine Schicht eines blaugrünen bildfarbstoffliefernden Materials, eine Schicht einer Rotempfindlichen Silberhalogenidemulsion, eine Zwischenschicht, eine Schicht eines purpurnen bildfarbstoffliefernden Materials, eine Schicht einer grünempfindlichen Silberhalogenidemulsion, eine Zwischenschicht, eine Schicht eines gelben bildfarbstoffliefernden Materials und eine Schicht einer blauempfindlichen Silberhalogenidemulsion trägt, wobei mindestens eine Silberhalogenid-Emulsionsschicht und die ihr zugeordnete Schicht des bildfarbstoffliefernden Materials durch eine Abstandschicht getrennt ist, die ein das Licht reflektierendes Pigment enthält, das in inerten polymeren Teilchen dispergiert ist, die in Alkali im wesentlichen unquellbar sind und die im wesentlichen keine Filme bilden.
22. Photographisches Verfahren nach Anspruch 20, worin das das Licht reflektierende Pigment Titandioxid ist.
23. Photographisches Verfahren nach Anspruch 21, worin die Abstandsschicht zwischen der Schicht des rotempfindlichen Silberhalogenids und der Schicht des blaugrünen bildfarbstoffliefernden Materials angeordnet ist.
24. Photographisches Verfahren nach Anspruch 20, worin das bildliefernde Material ein Entwicklerfarbstoff ist.
25. Photographisches Verfahren nach Anspruch 20, worin das Polymer Polymethylmethacrylat ist.
' 26. Photographisches Verfahren nach Anspruch 20, worin das erste folienartige Element eine bfauempfindliche Silberhalogenidemulsion, eine grünempfindliche Silberhalogenidemulsion und eine rotempfindliche Silberhalogenidemulsion enthält, wobei den Silberhalogenidemulsion jeweils ein gelber Entwicklerfarbstoff, ein purpurner Entwicklerfarbstoff bzw. ein blaugrüner Entwicklerfarbstoff zugeordnet ist.
27. Photographisches Verfahren nach Anspruch 20, worin die Bildempfangsschicht im zweiten folienartigen Element angeordnet ist.
28. Filmeinheit für das Diffusionsübertragungsverfahren, enthaltend ein erstes folienartiges Element und ein zweites folienartiges Element, wobei das erste folienartige Element eine Unterlage enthält, die eine Silberhalogenid-Emulsionsschichtträgt; wobei das zweite folienartige Element mindestens eine Unterlage enthält; eine Bitdempfangsschicht, die sich auf einer Seite der folienartigen Elemente befindet; eine viskose wäßrig-alkalische Entwicklermasse, die freisetzbar in einem aufreißbaren Behälter enthalten ist, der so angeordnet ist, daß er die Masse zur Verteilung zwischen dem ersten und dem zweiten folienartigen Elementfreisetzt, wobei die Unterlagen außen angeordnet sind; wobei das erste folienartige Element eine Abstandsschicht zwischen der Silberhalogenid-Emulsionsschicht und einer Schicht eines bilderzeugenden Materials, das dem Silberhalogenid zugeordnet ist, enthält, und wobei die Abstandsschicht ein das Licht reflektierendes Pigment enthält, dadurch gekennzeichnet, daß das Pigment in inerten polymeren Teilchen dispergiert ist, die in Alkali im wesentlichen unquellbar sind und die im wesentlichen keine Filme bilden.
29. Filmeinheit nach Anspruch 28, worin das zweite folienartige Element durchsichtig ist.
30. Filmeinheit nach Anspruch 29, worin die Bildempfangsschicht in dem zweiten folienartigen Element angeordnet ist.
31. Filmeinheit nach Anspruch 28, worin die Bildempfangsschicht in dem ersten folienartigen Element angeordnet ist.
32. Filmeinheit nach Anspruch 28, worin das das Licht reflektierende Pigment Titandioxid darstellt.
33. Filmeinheit nach Anspruch 28, worin das erste folienartige Element eine blauempfindliche Silberhalogenidemulsion, eine grünempfindliche Silberhalogenidemulsion und eine rotempfindliche Silberhalogenidemulsion enthält, wobei den Silberhalogenidemulsionen jeweils ein gelber Entwicklerfarbstoff, ein purpurner Entwicklerfarbstoff bzw. ein blaugrüner Entwicklerfarbstoff zugeordnet ist.
34. Filmeinheit nach Anspruch 33, worin die Abstandsschicht zwischen der rotempfindlichen Silberhalogenidemulsion und dem blaugrünen Entwicklerfarbstoff angeordnet ist.
35. Filmeinheit nach Anspruch 33, worin die Abstandschicht zwischen dem blauempfindlichen Silberhalogenid und dem gelben Entwicklerfarbstoff angeordnet ist.
36. Filmeinheit nach Anspruch 28, worin das bilderzeugende Material ein zunächst diffundierbarer Bildfarbstoff oder ein Bildfarbstoff-Zwischenprodukt ist.
37. Filmeinheit nach Anspruch 28, worin das bilderzeugende Material ein zunächst nichtdiffundierbarer Bildfarbstoff oder Bildfarbstoff-Zwischenprodukt ist.
38. Filmeinheit nach Anspruch 32, worin das Polymer Polymethylmethacrylat ist.
EP82200641A 1981-05-26 1982-05-25 Lichtempfindliches Element und photografisches Verfahren Expired EP0066341B1 (de)

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US4542087A (en) * 1984-09-04 1985-09-17 Eastman Kodak Company Use of reflecting agent in yellow dye image-providing material layer
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CA1182676A (en) 1985-02-19
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DE3273132D1 (en) 1986-10-16

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