GB541232A - Improvements in fog inhibitors for photographic silver salt emulsions - Google Patents

Improvements in fog inhibitors for photographic silver salt emulsions

Info

Publication number
GB541232A
GB541232A GB2815/40A GB281540A GB541232A GB 541232 A GB541232 A GB 541232A GB 2815/40 A GB2815/40 A GB 2815/40A GB 281540 A GB281540 A GB 281540A GB 541232 A GB541232 A GB 541232A
Authority
GB
United Kingdom
Prior art keywords
nitroindazole
prepared
silver salt
photographic silver
fog inhibitors
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
Application number
GB2815/40A
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
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of GB541232A publication Critical patent/GB541232A/en
Expired legal-status Critical Current

Links

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
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
    • G03C7/407—Development processes or agents therefor
    • G03C7/413—Developers
    • 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
    • G03C1/34—Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression
    • 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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/29—Development processes or agents therefor
    • G03C5/305—Additives other than developers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

541,232. Indazole derivatives. KODAK, Ltd. (Eastman Kodak Co.). Feb. 14, 1940, No. 2815. [Class 2 (iii)] [Also in Group XX] 5-Nitroindazole is prepared by treating an acetic acid solution of 5-nitro-2-aminotoluene with aqueous sodium nitrite ; 1-methyl-5-nitroindazole is prepared by the re-action of 5-nitroindazole in sodium hydroxide solution with dimethyl sulphate. 5-p-Toluenesulphonamidoindazole, 5-benzoylacetaminoindazole, and 5-p-nitrobenzoylaminoindazole are prepared by reducing 5-nitroindazole and treating with the appropriate acid chloride. 5-Benzoylacetaminoindazole may also be prepared by heating 5-aminoindazole with ethyl benzoylacetate.
GB2815/40A 1939-11-10 1940-02-14 Improvements in fog inhibitors for photographic silver salt emulsions Expired GB541232A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US303878A US2271229A (en) 1939-11-10 1939-11-10 Fog inhibitor for photographic developers

Publications (1)

Publication Number Publication Date
GB541232A true GB541232A (en) 1941-11-19

Family

ID=23174091

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2815/40A Expired GB541232A (en) 1939-11-10 1940-02-14 Improvements in fog inhibitors for photographic silver salt emulsions

Country Status (2)

Country Link
US (1) US2271229A (en)
GB (1) GB541232A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2497917A (en) * 1947-10-17 1950-02-21 Eastman Kodak Co Method of producing direct positive photographs having increased density
BE489729A (en) * 1948-06-29
US2656271A (en) * 1949-10-24 1953-10-20 Keuffel & Esser Co Method of developing aged photosensitive material containing silver halide and a chromate
US2676103A (en) * 1950-03-18 1954-04-20 Fr Corp Process and composition for use in color photography
US2725290A (en) * 1951-11-14 1955-11-29 Eastman Kodak Co Development of multi-layer color films with developers containing mercapto azoles
US4172728A (en) * 1977-12-16 1979-10-30 E. I. Du Pont De Nemours And Company High contrast continuous tone developer and process of use
JPS56153342A (en) * 1980-04-30 1981-11-27 Fuji Photo Film Co Ltd Development inhibitor releasing type compound for photography
US4323642A (en) * 1981-03-09 1982-04-06 Eastman Kodak Company Stable photographic developers containing an indazole antifoggant and a lignosulfonate
US5272045A (en) * 1992-11-13 1993-12-21 Sun Chemical Corporation Water soluble antifoggant for powder developer solutions
US5811226A (en) * 1996-03-14 1998-09-22 Eastman Kodak Company Method of processing a silver halide photographic element which reduces fog

Also Published As

Publication number Publication date
US2271229A (en) 1942-01-27

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