EP0027460B1 - Diffusionsübertragungsfilmeinheit und Farbverfahren - Google Patents

Diffusionsübertragungsfilmeinheit und Farbverfahren Download PDF

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Publication number
EP0027460B1
EP0027460B1 EP80900936A EP80900936A EP0027460B1 EP 0027460 B1 EP0027460 B1 EP 0027460B1 EP 80900936 A EP80900936 A EP 80900936A EP 80900936 A EP80900936 A EP 80900936A EP 0027460 B1 EP0027460 B1 EP 0027460B1
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Prior art keywords
silver halide
diffusion transfer
halide emulsion
diazole
image
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EP80900936A
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English (en)
French (fr)
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EP0027460A1 (de
EP0027460A4 (de
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Ronald F. Lambert
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Polaroid Corp
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Polaroid Corp
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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
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes

Definitions

  • This invention relates to diffusion transfer photography
  • a photosensitive . element containing a dye developer and a silver halide emulsion is photo-exposed and a processing composition applied thereto, for example, by immersion, coating, spraying, flowing, etc., in the dark.
  • the exposed photosensitive element is superposed prior to, during, or after the processing composition is applied, on a second sheet-like element which may be utilized an 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 an image-receiving layer carried by said second sheet-like element.
  • the processing composition 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 of the latent image. This immobilisation is apparently, at least in part, due to a .change in the solubility characteristics of the dye developer upon oxidation and especially as regards its solubility in alkaline solutions. It may also be due in part to a tanning effect on the emulsion by oxidized developing agent, and in part to a localized exhaustion of alkali as a result of development.
  • the dye developer In 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 the superposed image-receiving layer, said transfer substantially excluding oxidizing 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 element 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 mast the developed silver halide emulsion or emulsions, is applied between the image-receiving layer and said silver halide emulsion or emulsions.
  • a substance e.g. a white pigment
  • 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 hydroquinonyl 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 US-A-2,983,606 and in US-A-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 of stratum of gelatin or polyvinyl alcohol.
  • suitable interlayers for example, by a layer of 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 js 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 js completed.
  • US-A-3,647,437 issued March 7, 1972 to Edwin H. Land, is concerned with improvements in products and processes disclosed in said US-A-3,41 5,644, 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.
  • the dye developers are preferably selected for their ability to provide colors that are useful in carrying out subtractive color photography, that is, the previously mentioned cyan, magenta and yellow.
  • the dye developers employed may be incorporated in the respective silver halide emulsion or, in the preferred embodiment, in a separate layer behind the respective silver halide emulsion, and such a layer of dye developer may be applied by use of a coating solution containing the respective dye developer distributed, in a concentration calculated to give the desired coverage of dye developer per unit area, in a film-forming natural, or synthetic, polymer, for example, gelatin, polyvinyl alcohol, and the like, adapted to be permeated by the processing composition.
  • US-A-33 53 956 and US-A-33 77 166 disclose diffusion transfer color processes and film units therefor, of the type using dye developers. These known film units contain imidazole or substituted imidazoles as development improvers. The imidazole derivatives used as development improvers all contain an imino nitrogen atom. Their main function is to produce a glossy transfer image and to improve blue contrast, respectively. However, nothing is said or indicated about the improvement of the transfer rates of unoxidized dye developers without adverse effects on minimum density.
  • US-A-38 08 003 relates to the use of certain substituted imidazoles to increase the speed of development of an exposed gelatino-silver halide photographic light-sensitive material.
  • the general formula includes four substituents R i to R 4 which are selected from the group consisting of a hydrogen atom, an alkyl group, a hydroxy alkyl group and an alkenyl group, and wherein at least one of R, to R 4 is selected from the group consisting of an alkyl group, a hydroxy alkyl group and an alkenyl group. Only if R i is a substituent other than hydrogen, one would arrive at one of the species contemplated by the present invention.
  • the invention relates to a diffusion transfer film unit comprising a photosensitive element comprising a support carrying at least one photosensitive silver halide emulsion layer, each said silver halide emulsion layer having associated therewith a dye developer; an aqueous alkaline processing composition; an image-receiving layer in superposed or superposable relationship with said silver halide emulsion layer(s); characterized in that said film unit includes a 5- or 6-membered aromatic unsaturated heterocyclic diazole or diazine, respectively, free of imino nitrogen atoms, said diazole or diazine being a liquid at room temperature.
  • heterocyclic diazoles and diazines may be said to be "aromatic" in that the 5- membered heterocyclic diazoles contain two double bonds and the 6-membered heterocyclic diazines contain three double bonds.
  • the nitrogen atoms may be adjacent or separated by one or two carbon atoms. Substituents on the ring carbons or nitrogens may include 1 to 2 carbon atoms. Examples of 5-and 6-membered unsaturated heterocyclic diazoles found useful in accordance with this invention include:
  • 1-methyl-imidazole should behave so differently from, e.g., imidazole or 2-methylimidazole is not fully understood it is believed that the absence of an imino nitrogen able to form an anion in alkaline solution is in some manner responsible for the different behavior.
  • 1-benzyl-imidazole on the other hand is a solid at room temperature.
  • a multicolor photosensitive element using, as the cyan, magenta and yellow dye developers was prepared by coating a gelatin-subcoated 0,1 mm opaque polyethylene terphthalate film base with the following layers:
  • a transparent 0.1 mm polyethylene terephthalate film base was coated, in succession, with the following layers to form an image-receiving component:
  • the photosensitive component was photoexposed and then taped to one end of the image-receiving component with a rupturable container retaining an aqueous alkaline processing solution fixedly mounted on the leading edge of each of the components, by pressure-sensitive tapes to make a film unit, so that, upon application of compressive pressure to the container to rupture the container's marginal seal, its contents would be distributed between the image-receiving layer and the gelatin overcoat of the photosensitive component.
  • the aqueous alkaline processing composition comprised: A layer approximately 0.076 mm thick of the processing composition was distributed by passing the film unit between a pair of pressure-applying rolls and into a lighted area. The resulting laminate was maintained intact to provide a multicolor integral negative-positive reflection print.
  • N-methyl imidazole Good results with N-methyl imidazole also were obtained with the same film unit using higher concentrations, e.g., 1.75% and 2.5%.
  • the substitution of 1,2-dimethyl imidazole for 1-methyl imidazole in the above experiment also gave increased transfer rates of unoxidized dye developer without adverse effect upon minimum density.
  • a photosensitive element was prepared similar to the one described in Example 1, using the same cyan and yellow dye developers and the following magenta dye developer: The coverages of the cyan, magenta and yellow dye developers, respectively, were on the order of 635, 645 and 920 mg./m 2 .
  • the 2-phenyl benzimidazole was replaced by N-dodecylamino-purine.
  • a plurality of such photosensitive elements were given identical exposures and then processed in the manner described in Example 1 using the same type of image-receiving element with the following processing composition applied in a layer approximately 0.076 mm thick, the processing composition comprising:
  • the relative rates of transfer of the image dyes was also measured using the same components and measured the density as a function of time using an automatic recording densitometer.
  • the following table indicates the difference in density at the given times between the control and the test compound at 1 and 2% weight per cent, decreased density at a given time being indicated by a minus sign.
  • the neutralizing and timing layers were positioned between the image-receiving layer and its transparent support.
  • the diazole is dissolved in the processing composition.
  • concentration of the diazole most appropriate for a given film unit may be determined by routine experimentation. In general, if the diazole is in the processing composition, the concentration may be in the range of about 0.5 to 3% by weight; higher concentrations may be used but have not been found to offer any advantages. The preferred concentration is about 0.5 to 1%.
  • diazoles also may be used in dye developer color transfer processes wherein the image-receiving element is separated from the developed photosensitive element.
  • the diazole e.g., 1-methyl imidazole
  • the diazole may exhibit a tendency to photolyze and stain the image.
  • N-n-dodecylamino purine is incorporated in one or more of the dye developer layers. This combination together with some of the diazoles, e.g., 1-methyl imidazole, has been found to give an increase in red speed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Claims (11)

1. Diffusionsübertragungs-Filmeinheit, enthaltend ein lichtempfindliches Element mit einer Unterlage, die mindestens eine lichtempfindliche Silberhalogenid-Emulsionsschicht trägt, wobei jeder Silverhalogenid-Emulsionsschicht ein Entwicklerfarbstoff zugeordnet ist; eine wäßrig-alkalische Entwicklermasse; eine Bildempfangsschicht, die über der (den) Silberhalogenid-Emulsionsschicht(en) liegt oder darüber gelegt werden kann; dadurch gekennzeichnet, daß die Filmeinheit ein 5- oder 6- gliedriges aromatisches ungesättigtes heterocyclisches Diazol, bezw. Diazin enthält, das frei von Imino-Stickstoffatomen ist, wobei das Diazol oder Diazin bei Raumtemperatur eine Flüssigkeit ist.
2. Diffusionsübertragungs-Filmeinheit nach Anspruch 1, worin das lichtempfindliche Element eine rotempfindliche Silberhalogenid-Emulsion, eine grünempfindliche Silberhalogenid-Emulsion und eine blauempfindliche Silberhalogenidemulsion enthält, wobei diesen Silberhalogenid-Emulsionen jeweils ein balugrüner Entwicklerfarbstoff, ein purpurner Entwicklerfarbstoff und ein gelber Entwicklerfarbstoff zugeordnet ist.
3. Diffusionsübertragungs-Filmeinheit nach Anspruch 1 oder 2, worin die Bildempfangsschicht auf einer zweiten, durchsichtigen Unterlage aufgebracht ist.
4. Diffusionsübertragungs-Filmeinheit nach einem der Ansprüche 1 bis 3, worin das Diazol oder Diazin ursprünglich in der Entwicklermasse vorhanden ist.
5. Diffusionsübertragungs-Filmeinheit nach einem der vorhergehenden Ansprüche, worin das Diazol oder Diazin 1-Methylimidazol, 1,2-Dimethyiimidazoi, 2-Methylpyrazin, 3-Methylpyridazin oder 4-Methylpyrimidin ist.
6. Diffusionsübertragungs-Filmeinheit nach einem der vorhergehenden Ansprüche, worin die Konzentration des Diazols oder Diazins etwa 0,5 bis 3 Gew.-%, vorsugsweise etwa 0,5 bis 1 % beträgt.
7. Diffusionsübertragungs-Filmeinheit nach einem der vorhergehenden Ansprüche, worin der Entwicklerfarbstoff ist:
Figure imgb0024
ou
Figure imgb0025
8. Farbdiffusionsübertragungsverfahren, bei dem eine lichtempfindliche Silberhalogenid-Emulsion belichtet und eine Entwicklermasse auf die belichtete Silberhalogenid-Emulsion aufgebracht wird, um die Entwicklung des belichteten Silberhalogenids zu bewirken, und wobei eine bildmäßige Verteilung von nicht oxidiertem Entwicklerfarbstoff in den unentwickelten Bereichen der Silberhalogenid-Emulsion als Funktion der Entwicklung gebildet wird, wobei das Verfahren die Stufe der Diffusionsübertragung mindestens eines Teils der bildmäßigen Verteilung des nicht oxidierten Entwicklerfarbstoffs auf eine Bildempfangsschicht, die über der Silberhalogenid-Emulsion liegt, umfaßt, wodurch ein positives Farbdiffusions-Übertragungsbild erhalten wird, dadurch gekennzeichnet, daß das Verfahren in Gegenwart eines 5- oder 6- gliedrigen aromatischen ungesättigten heterocyclischen Daizols bzw. Diazins, das frei von Imino-Stickstoffatomen ist, durchgeführt wird, wobei das Diazol oder Diazin bei Raumtemperatur eine Flüissigkeit ist.
9. Diffusionsübertragungsverfahren nach Anspruch 8, worin das Diazol oder Diazin ursprüngliche in der Entwicklermasse vorhanden ist.
10. Diffusionsübertragungsverfahren nach Anspruch 8 oder 9, worin das Diazol oder Diazin 1-Methylimidazol, 1,2-Dimethylimidazol, 2-Methylpyrazin, 3-Methylpyridazin oder 4-Methylpyrimidin ist.
11. Farbdiffusionsübertragsungsverfahren nach einem der Ansprüche 8 bis 10, worin das Diffusionsübertragungsbild ein mehrfarbiges Bild ist.
EP80900936A 1979-04-24 1980-11-04 Diffusionsübertragungsfilmeinheit und Farbverfahren Expired EP0027460B1 (de)

Applications Claiming Priority (2)

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US3295479A 1979-04-24 1979-04-24
US32954 1979-04-24

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EP0027460A1 EP0027460A1 (de) 1981-04-29
EP0027460A4 EP0027460A4 (de) 1981-08-27
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EP (1) EP0027460B1 (de)
JP (1) JPS6227378B2 (de)
CA (1) CA1137346A (de)
DE (1) DE3068777D1 (de)
WO (1) WO1980002331A1 (de)

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Publication number Priority date Publication date Assignee Title
US4503139A (en) * 1983-05-09 1985-03-05 Polaroid Corporation Photographic products and processes and novel compounds

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353956A (en) * 1963-02-18 1967-11-21 Polaroid Corp Photographic diffusion transfer processes utilizing an imidazole and an image-receiving element containing a polymeric acid layer
US3377166A (en) * 1966-04-19 1968-04-09 Eastman Kodak Co Photographic image transfer process utilizing imidazole
US3808003A (en) * 1969-01-24 1974-04-30 Fuji Photo Film Co Ltd Photographic material development method
US3649265A (en) * 1970-05-06 1972-03-14 Eastman Kodak Co Diffusion transfer system comprising dye developers, a pyrazolone and an onium compound
BE793233A (fr) * 1971-12-23 1973-06-22 Polaroid Corp Nouveaux produits, procede et compositions utilises en photographie
US3899331A (en) * 1973-11-14 1975-08-12 Polaroid Corp Multicolor dye developer diffusion transfer processes with pyrazolo-{8 3,4d{9 {0 pyrimidines
JPS5089034A (de) * 1973-12-07 1975-07-17
JPS5251940A (en) * 1975-10-24 1977-04-26 Fuji Photo Film Co Ltd Processing of silver halide photographic light sensitive material
US4049450A (en) * 1976-03-30 1977-09-20 Polaroid Corporation 4-Hydroxypyrazole developing agents

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IUPAC , Nomenclature of organic chemistry, 1979 edition, page 53 *

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JPS56500430A (de) 1981-04-02
JPS6227378B2 (de) 1987-06-15
EP0027460A1 (de) 1981-04-29
EP0027460A4 (de) 1981-08-27
CA1137346A (en) 1982-12-14
DE3068777D1 (en) 1984-09-06
WO1980002331A1 (en) 1980-10-30

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