GB1385039A - Photographic silver halide emulsions - Google Patents

Photographic silver halide emulsions

Info

Publication number
GB1385039A
GB1385039A GB1097772A GB1097772A GB1385039A GB 1385039 A GB1385039 A GB 1385039A GB 1097772 A GB1097772 A GB 1097772A GB 1097772 A GB1097772 A GB 1097772A GB 1385039 A GB1385039 A GB 1385039A
Authority
GB
United Kingdom
Prior art keywords
emulsion
layer
silver halide
treating
grains
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
GB1097772A
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 GB1385039A publication Critical patent/GB1385039A/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
    • G03C1/48538—Direct positive emulsions non-prefogged, i.e. fogged after imagewise exposure

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

1385039 Photographic silver halide emulsion EASTMAN KODAK CO 9 March 1972 [10 March 1971] 10977/72 Heading G2C A photographic silver halide internal-image emulsion comprises grains which (i) are formed of a silver halide which comprises more than 50 mole % silver bromide, (ii) contain occluded metal dopants which provide internal sites for the deposition of photolytic silver, and (iii) are surface-sensitized to an extent such that the emulsion when tested by the procedure specified in the specification comprising development in a surface developer gives a (transmission) density of less than 0.4, the extent of sensitization being at least that which for the specified test procedure gives a density of 0.5 for an undoped silver halide emulsion of the same grain size and halide composition. The metal dopant may be a metal ion, atom or compound. The emulsion may contain a fogging agent such as a hydrazine or an N-substituted cyclammonium quaternary salt, e.g. formyl-4-methylphenylhydrazine or 2-methyl-3-[3-(p-sulphophenylhydrazono) propyl] - benzothiazolium bromide. The internal sites or the surface sensitization may be effected by gold and sulphur sensitizers. The emulsion may be used in a diffusion transfer film unit which is preferably for colour image production (see Ex 8 and 9). Direct-positive images may be obtained by imagewise exposing a layer of the above emulsion and (a) selectively surface fogging the unexposed grains and treating the layer with a surface developer to develop the surface-fogged grains, (b) treating the layer with a surface developer and exposing the layer overall to light during development to selectively fog the initially unexposed grains, (c) treating the layer with a solution of a fogging agent and treating the layer with a surface developer, or (d) where the material contains a fogging agent in the emulsion or a water-permeable layer adjacent thereto, treating the layer with a surface developer. According to this invention it is found that with internal image silver halide emulsions comprising more than 50 mole per cent silver bromide a controlled small amount of surface sensitization gives direct-positive images, of better quality. Reference is made to Specification 1151230.
GB1097772A 1971-03-10 1972-03-09 Photographic silver halide emulsions Expired GB1385039A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12300571A 1971-03-10 1971-03-10

Publications (1)

Publication Number Publication Date
GB1385039A true GB1385039A (en) 1975-02-26

Family

ID=22406176

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1097772A Expired GB1385039A (en) 1971-03-10 1972-03-09 Photographic silver halide emulsions

Country Status (8)

Country Link
US (1) US3761276A (en)
JP (1) JPS5234213B1 (en)
BE (1) BE780538A (en)
BR (1) BR7201360D0 (en)
CA (1) CA976405A (en)
DE (1) DE2211728B2 (en)
FR (1) FR2128755B1 (en)
GB (1) GB1385039A (en)

Families Citing this family (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923513A (en) * 1973-01-18 1975-12-02 Eastman Kodak Co Direct positive processing of silver halide with metal dopants in diffusion transfer films
US3976486A (en) * 1973-07-27 1976-08-24 Polaroid Corporation Diffusion transfer color products and processes with substituted halide silver halide emulsions
US4011081A (en) * 1973-09-19 1977-03-08 Eastman Kodak Company Direct-positive double exposure process utilizing a primitive, unfogged silver halide emulsion containing an electron acceptor
US4035185A (en) * 1975-01-08 1977-07-12 Eastman Kodak Company Blended internal latent image emulsions, elements including such emulsions and processes for their preparation and use
JPS523426A (en) * 1975-06-27 1977-01-11 Fuji Photo Film Co Ltd Photosensitive material of direct positive halogenide silver
US4030925A (en) * 1975-08-06 1977-06-21 Eastman Kodak Company Photographic compositions and elements including internal latent image silver halide grains and acylhydrazinophenylthiourea nucleating agents therefor
US4030920A (en) * 1976-04-12 1977-06-21 Eastman Kodak Company Processing compositions containing glycols for color transfer processes comprising direct positive silver halide developement
US4080207A (en) * 1976-06-29 1978-03-21 Eastman Kodak Company Radiation-sensitive compositions and photographic elements containing N-(acylhydrazinophenyl) thioamide nucleating agents
JPS5319205A (en) * 1976-08-04 1978-02-22 Fuji Photo Film Co Ltd Ps plate for lithographic printing
JPS5814664B2 (en) * 1976-12-30 1983-03-22 富士写真フイルム株式会社 Processing method for silver halide photographic materials
DE2930627A1 (en) * 1978-07-29 1980-02-07 Konishiroku Photo Ind DIRECT POSITIVE RECORDING MATERIAL
JPS5565945A (en) * 1978-11-14 1980-05-17 Konishiroku Photo Ind Co Ltd Direct positive silver halide photographic material
US4335199A (en) * 1980-02-19 1982-06-15 E. I. Du Pont De Nemours And Company High contrast by imagewise iodide infection in a mixed silver halide system
JPS5870223A (en) * 1981-10-22 1983-04-26 Konishiroku Photo Ind Co Ltd Formation of direct positive image
US4444865A (en) * 1981-11-12 1984-04-24 Eastman Kodak Company Blended grain direct-positive emulsions and photographic elements and processes for their use
USRE32097E (en) * 1981-11-12 1986-03-25 Eastman Kodak Company Blended grain direct-positive emulsions and photographic elements and processes for their use
US4444874A (en) * 1982-09-15 1984-04-24 Eastman Kodak Company Photographic elements containing direct-positive emulsions and processes for their use
USRE32149E (en) * 1982-09-15 1986-05-20 Eastman Kodak Company Photographic elements containing direct-positive emulsions and processes for their use
US4504570A (en) * 1982-09-30 1985-03-12 Eastman Kodak Company Direct reversal emulsions and photographic elements useful in image transfer film units
JPS59177535A (en) * 1983-03-28 1984-10-08 Konishiroku Photo Ind Co Ltd Silver halide photographic emulsion and its production
JPS59208540A (en) * 1983-05-12 1984-11-26 Fuji Photo Film Co Ltd Silver halide emulsion generating internal latent image
JPS59216136A (en) * 1983-05-24 1984-12-06 Fuji Photo Film Co Ltd Photosensitive material for direct positive
JPS60254032A (en) * 1983-12-29 1985-12-14 Fuji Photo Film Co Ltd Photosensitive silver halide emulsion
US4552838A (en) * 1984-05-18 1985-11-12 Eastman Kodak Company Processes for the preparation of silver halide emulsions of controlled grain size distribution, emulsions produced thereby, and photographic elements
US4572892A (en) * 1984-05-21 1986-02-25 Eastman Kodak Company Direct positive photographic elements with incorporated maximum density enhancing antifoggants
JPS613137A (en) * 1984-06-15 1986-01-09 Fuji Photo Film Co Ltd Internal latent image type core/shell direct positive silver halide emulsion and its preparation
US4661438A (en) 1985-04-04 1987-04-28 Eastman Kodak Company Quaternized tellurium salt fog inhibiting agents for silver halide photography
JPS61250636A (en) 1985-04-30 1986-11-07 Fuji Photo Film Co Ltd Heat developable photosensitive material
AU588878B2 (en) 1985-05-31 1989-09-28 Konishiroku Photo Industry Co., Ltd. Method for forming direct positive color image
JPS623249A (en) * 1985-06-28 1987-01-09 Konishiroku Photo Ind Co Ltd Direct positive silver halide color photographic sensitive material
JPH083621B2 (en) 1985-07-31 1996-01-17 富士写真フイルム株式会社 Image forming method
US4643966A (en) * 1985-09-03 1987-02-17 Eastman Kodak Company Emulsions and photographic elements containing ruffled silver halide grains
CA1280312C (en) 1985-09-03 1991-02-19 Joe Edward Maskasky Emulsions and photographic elements containing ruffled silver halide grains
EP0224214B1 (en) 1985-11-21 1993-01-27 Fuji Photo Film Co., Ltd. Light-sensitive microcapsule containing polymerizable compound and silver halide, and light-sensitive material employing the same
JPH0619570B2 (en) 1986-02-07 1994-03-16 富士写真フイルム株式会社 Photosensitive material
US4857445A (en) * 1986-02-20 1989-08-15 Fuji Photo Film Co., Ltd. Direct positive photo-sensitive materials
JPH0727183B2 (en) * 1986-09-01 1995-03-29 富士写真フイルム株式会社 Direct positive image forming method
JPS63239439A (en) * 1986-11-25 1988-10-05 Konica Corp Direct positive silver halide photographic sensitive material
JPS6490444A (en) * 1987-09-30 1989-04-06 Fuji Photo Film Co Ltd Direct positive image forming method
JPH0690437B2 (en) 1987-12-02 1994-11-14 富士写真フイルム株式会社 Direct positive photographic material
JPH02156242A (en) * 1988-12-08 1990-06-15 Mitsubishi Paper Mills Ltd Engraving method for planographic printing plate
FR2664400A1 (en) * 1990-07-04 1992-01-10 Kodak Pathe INVERSIBLE PRODUCT FOR COLOR PHOTOGRAPHY.
US5272041A (en) * 1990-10-19 1993-12-21 Agfa-Gevaert, N.V. Negative type lithographic printing plate
JPH05165139A (en) * 1991-12-17 1993-06-29 Konica Corp Dye image forming method
JPH0887097A (en) * 1994-09-16 1996-04-02 Konica Corp Picture forming method
EP0754967A1 (en) 1995-07-14 1997-01-22 Agfa-Gevaert N.V. Photographic direct positive material containing a particular stabilizer

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE550907A (en) *
US2497875A (en) * 1947-10-17 1950-02-21 Eastman Kodak Co Direct positive photographs using aerial fogging developer
US2497917A (en) * 1947-10-17 1950-02-21 Eastman Kodak Co Method of producing direct positive photographs having increased density
US2588982A (en) * 1950-10-26 1952-03-11 Eastman Kodak Co Direct positive photographs using hydrazine in the emulsion
US3206313A (en) * 1961-05-15 1965-09-14 Eastman Kodak Co Chemically sensitized emulsions having low surface sensitivity and high internal sensitivity
US3206312A (en) * 1962-06-12 1965-09-14 Eastman Kodak Co Photographic film having antistatic agent therein
GB1150553A (en) * 1965-04-30 1969-04-30 Agfa Gevaert Nv A Method of Producing Photographic Images
FR1484742A (en) * 1965-04-30 1967-06-16 Agfa Gevaert Nv Method for producing direct positive photographic images
GB1151363A (en) * 1965-04-30 1969-05-07 Agfa Gevaert Nv A Method of Producing Photographic Images
US3317322A (en) * 1965-08-27 1967-05-02 Eastman Kodak Co Photographic emulsions having high internal sensitivity
US3574625A (en) * 1967-04-07 1971-04-13 Eastman Kodak Co Photographic systems with polyvalent metal ions contiguous to the silver halide grains
BE743560A (en) * 1969-01-25 1970-05-28 Fuji Photo Film Co Ltd Direct positive photosensitive silver halide photographic elements

Also Published As

Publication number Publication date
BR7201360D0 (en) 1973-06-05
JPS5234213B1 (en) 1977-09-02
CA976405A (en) 1975-10-21
DE2211728A1 (en) 1972-09-21
FR2128755A1 (en) 1972-10-20
US3761276A (en) 1973-09-25
FR2128755B1 (en) 1976-01-16
DE2211728B2 (en) 1978-12-21
BE780538A (en) 1972-07-03

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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