GB884840A - The production of photographic silver halide emulsions - Google Patents

The production of photographic silver halide emulsions

Info

Publication number
GB884840A
GB884840A GB3515259A GB3515259A GB884840A GB 884840 A GB884840 A GB 884840A GB 3515259 A GB3515259 A GB 3515259A GB 3515259 A GB3515259 A GB 3515259A GB 884840 A GB884840 A GB 884840A
Authority
GB
United Kingdom
Prior art keywords
silver halide
added
dispersion
emulsions
polystyrene
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
GB3515259A
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
Publication of GB884840A publication Critical patent/GB884840A/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
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/015—Apparatus or processes for the preparation of emulsions
    • 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
    • G03C7/388—Processes for the incorporation in the emulsion of substances liberating photographically active agents or colour-coupling substances; Solvents therefor
    • G03C7/3882—Processes for the incorporation in the emulsion of substances liberating photographically active agents or colour-coupling substances; Solvents therefor characterised by the use of a specific polymer or latex

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

884,840. Photographic silver halide emulsions. AGFA A.G. Oct. 16, 1959 [Oct. 16, 1958], No. 35152/59. Class 98(2). Photographic emulsions are prepared by precipitating an aqueous gelatine silver halide dispersion by means of a water-soluble polystyrene sulphonic acid or salt thereof at a pH of 6 or less, separating the coagulum and redispersing it in an aqueous liquid. The polystyrene compound may first be added to the silver halide dispersion, or included in one of the solutions from which the dispersion is formed, and then the pH adjusted to 6 or below. Alternatively, the pH of the dispersion may be adjusted before the polystyrene compound is added. The flocculation is assisted by the presence of heavy metal salts such as the chlorides or bromides of cadmium or copper. The redispersion in water may be effected by adjusting the pH to between 6 and 10 and more gelatine or other colloid can be added to the resulting emulsion. The quantity of polystyrene compound used may be more than is necessary to effect precipitation so that it replaces some of the gelatin as the colloid binder. The usual adjuvants including colour couplers may be added to the emulsions before coating; or the colour coupler may be incorporated before precipitation with the polystyrene compound. Specifications 648,472 and 651,318 are referred to.
GB3515259A 1958-10-16 1959-10-16 The production of photographic silver halide emulsions Expired GB884840A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA30548A DE1085422B (en) 1958-10-16 1958-10-16 Process for the preparation of photographic silver halide emulsions

Publications (1)

Publication Number Publication Date
GB884840A true GB884840A (en) 1961-12-20

Family

ID=6927257

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3515259A Expired GB884840A (en) 1958-10-16 1959-10-16 The production of photographic silver halide emulsions

Country Status (5)

Country Link
BE (1) BE583637A (en)
CH (1) CH386838A (en)
DE (1) DE1085422B (en)
FR (1) FR1240772A (en)
GB (1) GB884840A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3341333A (en) * 1963-10-18 1967-09-12 Gen Aniline & Film Corp Process for preparing photographic emulsions
US5977190A (en) * 1998-01-14 1999-11-02 Eastman Kodak Company Process for deionizing and concentrating emulsions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB967624A (en) * 1960-09-21 1964-08-26 Gavaert Photo Producten N V Improvements in or relating to the preparation of photographic silver halide emulsions
GB1414783A (en) * 1972-08-03 1975-11-19 Agfa Gevaert Preparation of silver halide emulsions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3341333A (en) * 1963-10-18 1967-09-12 Gen Aniline & Film Corp Process for preparing photographic emulsions
US5977190A (en) * 1998-01-14 1999-11-02 Eastman Kodak Company Process for deionizing and concentrating emulsions

Also Published As

Publication number Publication date
BE583637A (en)
DE1085422B (en) 1960-07-14
CH386838A (en) 1965-01-15
FR1240772A (en) 1960-09-09

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