US2709135A - Process for the direct production of positive photographic images - Google Patents

Process for the direct production of positive photographic images Download PDF

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Publication number
US2709135A
US2709135A US217910A US21791051A US2709135A US 2709135 A US2709135 A US 2709135A US 217910 A US217910 A US 217910A US 21791051 A US21791051 A US 21791051A US 2709135 A US2709135 A US 2709135A
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US
United States
Prior art keywords
layer
silver halide
silver
water
sensitive
Prior art date
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 - Lifetime
Application number
US217910A
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English (en)
Inventor
Weyde Edith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert NV
Original Assignee
Agfa AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agfa AG filed Critical Agfa AG
Application granted granted Critical
Publication of US2709135A publication Critical patent/US2709135A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
    • G03C8/02—Photosensitive materials characterised by the image-forming section
    • G03C8/04—Photosensitive materials characterised by the image-forming section the substances transferred by diffusion consisting of inorganic or organo-metallic compounds derived from photosensitive noble metals
    • G03C8/06—Silver salt diffusion transfer

Definitions

  • This invention relates to a process for the direct production of positive photographic images.
  • the reception material has to be provided with a coating, for instance, of gelatine or another water-permeable colloid, containing the silver halide solvent and the nuclei for development required for producing the positive image.
  • the positive images are produced on transparent reception layers they may be used as intermediate prints for the diazo type process.
  • the reception material used for this process cannot be produced in any desired thickness, since the colloids containing the silver halide solvents can be applied only to relatively thick supports. Therefore, it was not possible up to the present to obtain prints on very thin materials, for instance, on paper customarily used for air-mail.
  • direct positive images are produced on extra ordinarily thin, water-permeable materials, for instance, sheets of regenerated cellulose or sheets of paper weighing about 15-30 grams per square meter, by placing such sheets in the process referred to above between the light sensitive silver halide layer containing a developing substance and a paper or film support of normal thickness coated with a layer containing the silver halide solvents and, if desired, nuclei for development, and after soaking with an alkaline solution, pressing together all three layers, preferable mechanically.
  • the silver halide solvent dissolves in the developing solution, passes through One embodiment of said process conthe very thin intermediate sheet of paper, regenerated cellulose etc.
  • Nuclei for development are substances which cause catalytically the reduction of the dissolved silver halide by the developing substances after their diitusion into the reception material.
  • colloidal silver colloidal silver sulfide, colloidal silver selenide, colloidal silver telluride, colloidal gold.
  • the nuclei for development or the substances producing them may be incorporated in the intermediate sheet in different manner.
  • the sheets are, for instance, impregnated With solutions containing nuclei for development, such as colloidal silver. They may also be bathed in dilute solutions of silver nitrate as, for instance, in an alcoholic solution containing 0.001% silver nitrate.
  • nuclei for development it is possible to incorporate these nuclei for development in the thin sheets already during their production.
  • some kinds of paper contain substances (originating from the gluing process which may act as nuclei for development so that the addition of special nuclei for development or substances producing such nuclei for development may be dispensed with.
  • the process of the present invention may be varied within wide limits.
  • the thin sheet on which the positive images are to be produced and/ or the silver halide emulsion may contain substances influencing the tone of the image, for instance, mercapto compounds. Such substances are described, for instance, in German Patent 473,000.
  • Example A light sensitive material is obtained by coating photographic paper 1 of normal thickness (85 g./m. with a silver-chloride-bromide emulsion layer 2 containing per liter 20 g. of hydroquinone, 20 g. of potassium metabisulfite and 0.05 g. of 1-phenyll-rnercaptotetrazole (coating thickness corresponding to 1-15 g. of silver/ m.**).
  • a silver-chloride-bromide emulsion layer 2 containing per liter 20 g. of hydroquinone, 20 g. of potassium metabisulfite and 0.05 g. of 1-phenyll-rnercaptotetrazole (coating thickness corresponding to 1-15 g. of silver/ m.**).
  • the reception layer 4 there is coated an 8% gelatine solution containing 30 g. of NazSzOs per liter, on a paper support 5.
  • a weakly sized thin typeas writing paper (Weighing 30 g
  • a process for the direct production of photographic positive silver images by using a light sensitive silver halide emulsion layer coated on a paper support, a separate nonlight-sensitive water-permeable colloid layer containing a silver halide solvent coated on a support and a separate thin sheet or" a water-permeable material, having a weight of 15-30 grams per square meter which comprises exposing said silver halide layer to an object, developing said exposed silver halide layer by immersing it in an alkaline solution in the presence of a photographic developing substance and bringing one side of the thin sheet of a water-permeable material in close contact with the exposed silver halide layer and the other side with the nonlight-sensitive layer containing a silver halide solvent, so that the exposed part of the emulsion layer is developed to a negative image of the object, whereas part of the non-exposed silver halide layer is dissolved by the silver halide solvent after the latter has difiused from the nonlight-sensitive layer through the thin sheet of water-per

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US217910A 1950-03-29 1951-03-28 Process for the direct production of positive photographic images Expired - Lifetime US2709135A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF1158A DE825349C (de) 1950-03-29 1950-03-29 Verfahren zur direkten Herstellung von Positiven

Publications (1)

Publication Number Publication Date
US2709135A true US2709135A (en) 1955-05-24

Family

ID=7082742

Family Applications (1)

Application Number Title Priority Date Filing Date
US217910A Expired - Lifetime US2709135A (en) 1950-03-29 1951-03-28 Process for the direct production of positive photographic images

Country Status (6)

Country Link
US (1) US2709135A (is")
BE (1) BE502129A (is")
CH (1) CH291535A (is")
DE (1) DE825349C (is")
FR (1) FR1080425A (is")
GB (1) GB701051A (is")

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250619A (en) * 1962-06-25 1966-05-10 Eastman Kodak Co Stain-free paper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2500421A (en) * 1944-11-03 1950-03-14 Polaroid Corp Photographic silver halide transfer process
US2543181A (en) * 1947-01-15 1951-02-27 Polaroid Corp Photographic product comprising a rupturable container carrying a photographic processing liquid
US2584030A (en) * 1947-02-07 1952-01-29 Polaroid Corp Light sensitive silver halide photographic product for image transfer and process utilizing the same
US2635048A (en) * 1948-07-06 1953-04-14 Polaroid Corp Photographic transfer product and process
US2647056A (en) * 1948-02-12 1953-07-28 Polaroid Corp One step photographic transfer process

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2500421A (en) * 1944-11-03 1950-03-14 Polaroid Corp Photographic silver halide transfer process
US2543181A (en) * 1947-01-15 1951-02-27 Polaroid Corp Photographic product comprising a rupturable container carrying a photographic processing liquid
US2584030A (en) * 1947-02-07 1952-01-29 Polaroid Corp Light sensitive silver halide photographic product for image transfer and process utilizing the same
US2647056A (en) * 1948-02-12 1953-07-28 Polaroid Corp One step photographic transfer process
US2635048A (en) * 1948-07-06 1953-04-14 Polaroid Corp Photographic transfer product and process

Also Published As

Publication number Publication date
BE502129A (is")
CH291535A (de) 1953-06-30
GB701051A (en) 1953-12-16
FR1080425A (fr) 1954-12-09
DE825349C (de) 1951-12-17

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