GB1287425A - Method of making sensitive photographic materials - Google Patents

Method of making sensitive photographic materials

Info

Publication number
GB1287425A
GB1287425A GB53255/69A GB5325569A GB1287425A GB 1287425 A GB1287425 A GB 1287425A GB 53255/69 A GB53255/69 A GB 53255/69A GB 5325569 A GB5325569 A GB 5325569A GB 1287425 A GB1287425 A GB 1287425A
Authority
GB
United Kingdom
Prior art keywords
blend
halide
emulsion
pag
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
GB53255/69A
Inventor
Malcolm Lawrence Judd
Fred Walter Spangler
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 GB1287425A publication Critical patent/GB1287425A/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
    • G03C1/485—Direct positive emulsions
    • G03C1/48515—Direct positive emulsions prefogged
    • 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
    • G03C1/46—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein having more than one photosensitive layer

Landscapes

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

Abstract

1287425 Photographic silver halide materials EASTMAN KODAK CO 30 Oct 1969 [4 Nov 1968] 53255/69 Heading G2C A sensitive photographic material is produced by coating a support with a blend of photographic silver halide emulsions of different average grain sizes which has a pAg below 8À6, and an adjacent layer containing sufficient of a water-soluble halide to raise the pAg of the layer of the blend to above 9À0. Each emulsion of the blend may be silver bromide or bromoiodide. One silver halide emulsion of the blend may have an average grain size at least 50% greater than another. The silver halide emulsions may be monodisperse or direct-positive, and each emulsion may contain an electron acceptor and/or a BSI compound (see U. K. patent Specification 1186718). The water-soluble halide layer may contain a hydrophilic colloid. The water-soluble halide may be an ammonium, alkali metal, cadmium or strontium halide. By this method an emulsion blend may be prepared and kept at a relatively low pAg, when little or no Ostwald ripening occurs and then modified by addition of halide to raise the pAg to a relatively high value and so improve the photographic properties, without causing any substantial change in grain size distribution.
GB53255/69A 1968-11-04 1969-10-30 Method of making sensitive photographic materials Expired GB1287425A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77332868A 1968-11-04 1968-11-04

Publications (1)

Publication Number Publication Date
GB1287425A true GB1287425A (en) 1972-08-31

Family

ID=25097894

Family Applications (1)

Application Number Title Priority Date Filing Date
GB53255/69A Expired GB1287425A (en) 1968-11-04 1969-10-30 Method of making sensitive photographic materials

Country Status (4)

Country Link
US (1) US3600167A (en)
BE (1) BE741199A (en)
FR (1) FR2022506A1 (en)
GB (1) GB1287425A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023972A (en) * 1973-06-18 1977-05-17 Agfa-Gevaert N.V. Method of preparing a blend of fogged, direct-positive silver halide emulsions of different average grain sizes

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2114030A5 (en) * 1970-11-13 1972-06-30 Kodak Pathe
JPS57178235A (en) * 1981-04-28 1982-11-02 Konishiroku Photo Ind Co Ltd Photographic sensitive silver halide material
JPS5814829A (en) * 1981-07-20 1983-01-27 Konishiroku Photo Ind Co Ltd Silver halide photosensitive material
DE3403825A1 (en) * 1983-02-04 1984-08-16 Mitsubishi Paper Mills, Ltd., Tokyo Photographic light-sensitive silver halide materials
JPH05289213A (en) * 1992-04-08 1993-11-05 Fuji Photo Film Co Ltd Preparation of prefogged direct positive type sliver halide emulsion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023972A (en) * 1973-06-18 1977-05-17 Agfa-Gevaert N.V. Method of preparing a blend of fogged, direct-positive silver halide emulsions of different average grain sizes

Also Published As

Publication number Publication date
BE741199A (en) 1970-04-16
US3600167A (en) 1971-08-17
FR2022506A1 (en) 1970-07-31

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee