US3630734A - Photographic diffusion transfer product and process - Google Patents

Photographic diffusion transfer product and process Download PDF

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Publication number
US3630734A
US3630734A US806738A US3630734DA US3630734A US 3630734 A US3630734 A US 3630734A US 806738 A US806738 A US 806738A US 3630734D A US3630734D A US 3630734DA US 3630734 A US3630734 A US 3630734A
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US
United States
Prior art keywords
silver halide
per square
square meter
grams per
receiving layer
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
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US806738A
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English (en)
Inventor
David Alan Cottingham
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.)
Eastman Kodak Co
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Eastman Kodak Co
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Filing date
Publication date
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Publication of US3630734A publication Critical patent/US3630734A/en
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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

  • a receiving layer for use in the silver salt diffusion transfer process comprises a silver precipitant, Z-methyl hydroquinone, p-N-methylaminophenol, an alkali metal bro mide and a silver halide solvent.
  • a plurality of copies are obtained from a single negative by the silver salt diffusion transfer process by repeatedly contacting an exposed silver halide emulsion layer containing hydroquinone with this receiving layer in the presence of an aqueous alkaline processing solution containing a silver halide solvent.
  • the present invention relates to a method of obtaining a plurality of copies by the silver salt diffusion process.
  • a receiving layer comprises Z-methyl hydroquinone, p-N-methylamine phenol, an alkali metal bromide such as potassium bromide, a silver precipitant, and a silver halide solvent.
  • a plurality of copies of a single negative are made by repeatedly contacting the exposed silver halide emulsion layer in the presence of an aqueous alkaline activator solution with this receiving layer.
  • the silver halide emulsion contains hydroquinone and the aqueous alkaline activator solution contains a silver halide solvent.
  • the silver halide emulsion layer is of the conventional type used in the silver salt diffusion transfer systems except that it includes hydroquinone.
  • Suitable emulsions include silver chlorobromide emulsions, silver bromide emulsions containing silver chloride and silver chloride emulsions any of which can also contain small amounts of silver iodide.
  • emulsions are used which mainly contain silver chloride. If, however, exposure time as short as possible is 'wanted, it is advantageous to use sensitive silver bromide emulsions which contain a small amount of silver chloride.
  • the binder for the emulsion is conveniently gelatin, but may include other known binders, either alone or in admixture with gelatin.
  • the amount of silver in the emulsion can vary widely and is generally present in an amount equivalent to from about 0.5 to about 5 grams AgNO per square meter.
  • the amount of hydroquinone in the emulsion layer can vary widely, but it is generally between about 0.1 to about 0.5 grams per square meter, e.g., 0.2 grams per square meter.
  • the positive, or receiving, layer includes a silver precipitant such as development nuclei for promoting development of diffused silver salt to metallic silver, or a substance or substances capable of forming such nuclei in situ, e.g., by reaction with a compound or compounds present in a processing liquid.
  • Suitable development nuclei include the sulfides of heavy metals, e.g., of antimony, bismuth, cadmium, cobalt, lead, nickel, silver and zinc. Selenides, polysulfides, polyselenides, mercaptans, stannous halides, heavy metals or their salts, and fogged silver halides are also suitable for this purpose.
  • the complex salts of lead sulfide and zinc sulfide are effective either in themselves or mixed with thioacetamide, dithiobiuret and dithiooxamide.
  • the development nuclei are provided in any conventional binder such as gelatin.
  • the receiving layer which is provided on any convenient suitable support also contains 2-methyl hydroquinone, p-N- methylaminophenol developing agent and a small amount of silver halide solvent and an alkali metal bromide such as potassium bromide.
  • the amount of 2-methyl hydroquinone in the receiving layer can vary widely but is preferably not less than 0.2 grams and can be within the range of about 0.2 to about 2.0 grams per square meter.
  • the amount of p-N- methylaminophenol in the receiving layer can also vary widely, but is preferably not less than 0.5 grams and can be within the range of about 0.5 to about 2.0 grams per square meter.
  • the concentration of p-N-methylaminophenol is from about 0.5 to about 1.0 gram per square meter and the concentration of Z-methylhydroquinone is from about 1.0 to about 0.2 grams per square meter of the receiving material.
  • These two developing agents can be used in substantially inverse proportions to each other, e.g., if the concentration of the p-N-methylaminophenol is doubled, that of the methyl hydroquinone can be halved.
  • the alkali metal bromide e.g., potassium bromide, is present in the receiving layer in a small amount, less than about 0.5 grams per square meter and preferably from about 0.03 to about 0.3 grams per square meter.
  • the amount of silver halide solvent, preferably sodium thiosulfate, present in the receiving layer is also less than about 0.5 grams per square meter and preferably from about 0.03 to about 0.3 grams per square meter.
  • concentrations of the bromide and thiosulfate in the receiving layer are preferably substantially equal, e.g., about 0.1 gram per square meter.
  • the alkaline processing solution can include carboxymethylcellulose or other conventional thickening agent if desired and in the usual amount to achieve a desired consistency.
  • the pH of the solution is preferably at least about 9.5.
  • the amount of silver halide solvent, conveniently sodium thiosulfate, can vary widely and conventional levels, known per se in the art, can be used. In general, the concentration of sodium thiosulfate will be between about 2 and about 5 grams per liter.
  • the activator solution is preferably substantially free of developing agents.
  • Suitable bases for use in the processing liquid are inorganic bases such as sodium hydroxide, potassium hydroxide, lithium hydroxide, ammonium hydroxide, sodium carbonate and sodium phosphate, or organic bases such as organic amines such as diethanolamine.
  • anhydrous salt of from, e.g., 50 to 200 gram per liter.
  • a compound which imparts a high degree of alkalinity e.g., sodium hydroxide
  • a lesser amount e.g., from 5 to 20 grams, will suffice.
  • the processing liquid can further contain other usual ingredients such as sodium sulfite, e.g., in an amount of from 10 to 40 grams per liter, a calcium sequestering compound and a black toning agent, e.g., l-phenyl-S-mercapto-tetrazole.
  • sodium sulfite e.g., in an amount of from 10 to 40 grams per liter
  • calcium sequestering compound e.g., l-phenyl-S-mercapto-tetrazole.
  • black toning agent e.g., l-phenyl-S-mercapto-tetrazole.
  • EXAMPLE 1 A gelatino silver halide emulsion is coated on a support to provide an equivalent to 1.2 grams AgNO per square meter.
  • the emulsion contains hydroquinone in an amount sufficient to provide 0.2 grams per square meter.
  • the exposed original is pressed into contact with a receiving layer in the presence of an aqueous activator solution containing 5 grams per liter sodium thiosulfate and bufiered to a pH of 10.5 with trisodium phosphate.
  • the receiving layer is provided by coating, on a paper sheet, a gelatin layer containing nickel sulfide, 0.2 grams per square meter methyl hydroquinone, 0.5 grams per square meter of p-N-methylaminophenol, 0.1 grams per square meter of potassium bromide, and 0.] grams per square meter of sodium thiosulfate. In this manner, six good copies of the original image are obtained from the single negative.
  • a receiving layer for use in the silver salt diffusion transfer process comprising a silver precipitant, 2-methyl hydroquinone, p-N-methylaminophenol, an alkali metal bromide and a silver halide solvent.
  • a photographic element comprising a support having thereon said layer of claim 1.
  • a layer of claim 1 wherein said receiving layer comprises from about 0.03 to about 0.3 grams per square meter of alkali metal bromide.
  • a layer of claim 1 wherein said receiving layer comprises an amount of silver halide solvent within the range of about 0.03 to 0.3 grams per square meter.
  • a layer of claim 1 wherein said silver halide solvent is sodium thiosulfate.
  • a layer of claim 1 wherein said receiving layer contains an amount within the range of about 0.2 to about 4.0 grams per square meter of 2-methyl hydroquinone and about 0.5 to about 4.0 grams per square meter of p-N-methylaminophenol.
  • a layer of claim 3 wherein said receiving layer contains substantially the same concentration of silver halide solvent and alkali metal bromide in grams per square meter.
  • a method of obtaining a plurality of copies from an exposed silver halide emulsion by the silver salt difiusion transfer process which comprises contacting an exposed emulsion layer containing silver halide and hydroquinone with a first receiving layer containing development nuclei.
  • 2-methyl hydroquinone, p-N-methylaminophenol, an alkali metal bromide and a silver halide solvent in the presence of an aqueous alkaline activator solution comprising silver halide solvent to form a first copy in said first receiving layer, separating the layers, and recontacting said exposed silver halide emulsion layer with at least one additional receiving layer containing development nuclei, 2-methyl hydroquinone, p-N- methylaminophenol, an alkali metal bromide and a silver halide solvent in the presence of said activator solution to form at least one additional copy in each of said additional receiving layers.
  • said emulsion layer contains from about 0.5 to about 0.l gram per square meter of hydroquinone.
  • a method according to claim 9 wherein said silver halide solvent is sodium thiosulfate.
  • said silver halide solvent of said aqueous activator solution comprises sodium thiosulfate.

Landscapes

  • 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)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US806738A 1969-03-12 1969-03-12 Photographic diffusion transfer product and process Expired - Lifetime US3630734A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US80673869A 1969-03-12 1969-03-12

Publications (1)

Publication Number Publication Date
US3630734A true US3630734A (en) 1971-12-28

Family

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Family Applications (1)

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US806738A Expired - Lifetime US3630734A (en) 1969-03-12 1969-03-12 Photographic diffusion transfer product and process

Country Status (5)

Country Link
US (1) US3630734A (fr)
BE (1) BE747004A (fr)
CA (1) CA929017A (fr)
FR (1) FR2037740A5 (fr)
GB (1) GB1294911A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798779A (en) * 1986-01-30 1989-01-17 Fuji Photo Film Co., Ltd. Process for forming an image by silver salt diffusion transfer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834676A (en) * 1955-07-19 1958-05-13 Sperry Rand Corp Photographic diffusion transfer process for producing multiple direct positive copies
US3015562A (en) * 1958-05-07 1962-01-02 Gen Aniline & Film Corp Receiving sheet for use in photographic silver transfer process
US3396018A (en) * 1963-05-17 1968-08-06 Eastman Kodak Co Diffusion transfer system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834676A (en) * 1955-07-19 1958-05-13 Sperry Rand Corp Photographic diffusion transfer process for producing multiple direct positive copies
US3015562A (en) * 1958-05-07 1962-01-02 Gen Aniline & Film Corp Receiving sheet for use in photographic silver transfer process
US3396018A (en) * 1963-05-17 1968-08-06 Eastman Kodak Co Diffusion transfer system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798779A (en) * 1986-01-30 1989-01-17 Fuji Photo Film Co., Ltd. Process for forming an image by silver salt diffusion transfer

Also Published As

Publication number Publication date
GB1294911A (fr) 1972-11-01
CA929017A (en) 1973-06-26
BE747004A (fr) 1970-08-17
FR2037740A5 (fr) 1970-12-31

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