US2380280A - Chemical sensitizing of emulsions - Google Patents

Chemical sensitizing of emulsions Download PDF

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Publication number
US2380280A
US2380280A US478303A US47830343A US2380280A US 2380280 A US2380280 A US 2380280A US 478303 A US478303 A US 478303A US 47830343 A US47830343 A US 47830343A US 2380280 A US2380280 A US 2380280A
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US
United States
Prior art keywords
sodium
emulsion
speed
emulsions
silver halide
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
US478303A
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English (en)
Inventor
Walter J Weyerts
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
Original Assignee
Eastman Kodak Co
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
Priority to FR956707D priority Critical patent/FR956707A/fr
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US478303A priority patent/US2380280A/en
Application granted granted Critical
Publication of US2380280A publication Critical patent/US2380280A/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
    • 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
    • G03C1/08—Sensitivity-increasing substances
    • G03C1/10—Organic substances

Definitions

  • Agent used for this purpose have consisted for the most part in compounds of elements of the sulfur group and bio-chemica1 extracts.
  • the present invention relates to a new class oi.
  • photographic emulsions of the silver halide type may be treated with watersoluble salts of unsaturated lower aliphatic acids for the purpose of increasing the speed or sensitivity,
  • Water-soluble salts of unsaturated lower aliphatic acids include monobasic acids such as acrylic acid, methacrylic acid, benzoyl acrylic acid, furoyl acrylic acid and crotonic acid, and dibasic acids such as itaconlc acid, citraconic acid, and maleic acid.
  • monobasic acids such as acrylic acid, methacrylic acid, benzoyl acrylic acid, furoyl acrylic acid and crotonic acid
  • dibasic acids such as itaconlc acid, citraconic acid, and maleic acid.
  • Water-soluble salts of these acids which may be employed are the sodium, potassium and ammonium salts.
  • the degree of increase in sensitivity obtained has been found to vary with the type of emulsion employed and with the nature and quantity of salt added.
  • I'he addition agents of my invention may be employed with non-optically sensitized gelatino-silver halide emulsions or with emulsions sensitized with optical sensitizing dyes in the customary manner. In some instances the increase' in speed of the emulsion was accompanied by a.
  • Suitable compounds for increasing the speed of silver halide emulsions according to my invention are the folowing:
  • Example 1 lar emulsion to which had been added 10 grams per liter of emulsion of sodium acrylate.
  • the emulsion to which the sodium acrylate had been added showed a sensitivity increase of about 60% without an appreciable increase in the gamma or fog level.
  • the emulsions compared as follows:
  • Example 2 Monomethyl-p-aminophenol sulfate grams 2.2 Hydroquinone do 8.8 Sodium sulfite (desiccated) do 96 Sodium carbonate (desiccated) do 48 Potassium bromide dO 5 Water to liter 1
  • Example 2 A high speed optically sensitized emulsion of medium fine grain having a speed of 1320, a gamma of 0.74 and a fog level of 0.05 was compared with similar emulsions in which sodium acrylate and sodium methacrylate had been added in the amount of grams per liter of emulsions. A speed increase was noted as shown in the following table:
  • the emulsions were developed for 12 minutes in the following developing solution:
  • w/i Gamma speed Fog (heck .Q Emulsion with 5 g. sodium methucrylnte/ liter tained depends upon the quantity of the addition agent used. With these agents the speed increase varies from 25% to or more depending upon the'type of emulsion and the nature and quantity of the salt added.
  • my addition agents will generally be used with gelatino-silver halide emulsions, such as emulsions of the bromide or bromo-iodide type, they may also be used with silver halide emulsions in which the carrier is aibumcn, collodion or other cellulose ester or synthetic resin, provided that there is considerable water in the emulsion to act as a solvent for the addition agent.
  • the method of increasing the speed of a silver halide photographic emulsion which comprises adding thereto from 5 to 25 grams per liter of a water-soluble salt of an unsaturated, lower aliphatic acid.
  • the method'of increasing the speed of a silver halide photographic emulsion which comprises adding thereto from 5 to 25 grams per liter of the sodium salt of an unsaturated, lower alipliatic acid.
  • the method of increasing the speed of a silver halide photographic emulsion which comprises adding thereto from 5 to 25 grams per liter of a water-soluble salt of an unsaturated, lower aliphatic acid.

Landscapes

  • 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)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US478303A 1943-03-06 1943-03-06 Chemical sensitizing of emulsions Expired - Lifetime US2380280A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR956707D FR956707A (ko) 1943-03-06
US478303A US2380280A (en) 1943-03-06 1943-03-06 Chemical sensitizing of emulsions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US478303A US2380280A (en) 1943-03-06 1943-03-06 Chemical sensitizing of emulsions

Publications (1)

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US2380280A true US2380280A (en) 1945-07-10

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Family Applications (1)

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US478303A Expired - Lifetime US2380280A (en) 1943-03-06 1943-03-06 Chemical sensitizing of emulsions

Country Status (2)

Country Link
US (1) US2380280A (ko)
FR (1) FR956707A (ko)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019104A (en) * 1957-12-11 1962-01-30 Polaroid Corp Photographic products, processes, and compositions
US3038800A (en) * 1957-12-19 1962-06-12 Eastman Kodak Co Photopolymerization of olefinicallyunsaturated monomers by silver halides
US3060022A (en) * 1959-07-13 1962-10-23 Gen Aniline & Film Corp Image transfer process
US3312553A (en) * 1963-10-30 1967-04-04 Gen Aniline & Film Corp Photographic materials
US3346383A (en) * 1960-11-23 1967-10-10 Eastman Kodak Co Image reproduction processes utilizing photopolymerization of vinyl monomer compositions comprising a metallic sulfide compound
US4853323A (en) * 1985-10-16 1989-08-01 Fuji Photo Film Co., Ltd. Silver halide emulsion

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019104A (en) * 1957-12-11 1962-01-30 Polaroid Corp Photographic products, processes, and compositions
US3038800A (en) * 1957-12-19 1962-06-12 Eastman Kodak Co Photopolymerization of olefinicallyunsaturated monomers by silver halides
US3060022A (en) * 1959-07-13 1962-10-23 Gen Aniline & Film Corp Image transfer process
US3346383A (en) * 1960-11-23 1967-10-10 Eastman Kodak Co Image reproduction processes utilizing photopolymerization of vinyl monomer compositions comprising a metallic sulfide compound
US3312553A (en) * 1963-10-30 1967-04-04 Gen Aniline & Film Corp Photographic materials
US4853323A (en) * 1985-10-16 1989-08-01 Fuji Photo Film Co., Ltd. Silver halide emulsion

Also Published As

Publication number Publication date
FR956707A (ko) 1950-02-06

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