GB974984A - Stabilization of light-sensitive silver halide emulsions - Google Patents

Stabilization of light-sensitive silver halide emulsions

Info

Publication number
GB974984A
GB974984A GB37307/61A GB3730761A GB974984A GB 974984 A GB974984 A GB 974984A GB 37307/61 A GB37307/61 A GB 37307/61A GB 3730761 A GB3730761 A GB 3730761A GB 974984 A GB974984 A GB 974984A
Authority
GB
United Kingdom
Prior art keywords
hydrazine
bipyrazolyl
stabilization
light
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
Application number
GB37307/61A
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 GB974984A publication Critical patent/GB974984A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
    • C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
    • C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D231/12—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Plural Heterocyclic Compounds (AREA)

Abstract

5,51-Dimethyl-3,31-bipyrazolyl is prepared by reacting hydrazine with 2,4,5,7-octane-tetrone. By using methyl hydrazine sulphate instead of hydrazine, 1,11,5,51-tetramethyl-3, 31-bipyrazolyl is obtained. 3,31,5,51-Tetramethyl (or tetraethyl)-4, 41-bipyrazolyl is obtained by reacting hydrazine with 3,4-diacetyl-2, 5-hexanedione or 4,5-dipropionyl-3, 6-octanedione respectively. By using methyl hydrazine sulphate in the first reaction, instead of hydrazine, 1,11,3,31,5,51-hexamethyl-4, 41-bipyrazolyl is obtained. Methylene-4, 41-bis (3, 5-dimethyl pyrazole) is prepared by reacting hydrazine with 3,5-diacetyl-2-6-heptane-dione. By using methylhydrazine sulphate instead of hydrazine, methylene-4, 41-bis (1,3,5-trimethylpyrazole) is obtained. Specifications 581,772, 702,255 and 711,488 are referred to.
GB37307/61A 1960-10-19 1961-10-18 Stabilization of light-sensitive silver halide emulsions Expired GB974984A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US63482A US3106467A (en) 1960-10-19 1960-10-19 Bis-pyrazoles as antifoggants for photographic silver halide emulsions

Publications (1)

Publication Number Publication Date
GB974984A true GB974984A (en) 1964-11-11

Family

ID=22049501

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37307/61A Expired GB974984A (en) 1960-10-19 1961-10-18 Stabilization of light-sensitive silver halide emulsions

Country Status (2)

Country Link
US (1) US3106467A (en)
GB (1) GB974984A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2456274C1 (en) * 2011-01-11 2012-07-20 Государственное образовательное учреждение высшего профессионального образования "Алтайский государственный технический университет им. И.И. Ползунова" (АлтГТУ) Method of producing (3,5-dimethylpyrazol-4-yl)methane

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1763989A (en) * 1930-06-17 Photoctbaphic light-sensitive matebiax and pbocesb pob itakxng pat
US2588538A (en) * 1948-08-06 1952-03-11 Ilford Ltd Stabilizers in photographic emulsions and developers
BE498913A (en) * 1949-10-26
US3040047A (en) * 1960-04-04 1962-06-19 Takeda Pharmaceutical 2-(pyrazol-1-yl)-pyrimidine derivatives

Also Published As

Publication number Publication date
US3106467A (en) 1963-10-08

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