GB1387033A - Photographic direct-positive process and silver halide emulsion therefor - Google Patents

Photographic direct-positive process and silver halide emulsion therefor

Info

Publication number
GB1387033A
GB1387033A GB1097872A GB1097872A GB1387033A GB 1387033 A GB1387033 A GB 1387033A GB 1097872 A GB1097872 A GB 1097872A GB 1097872 A GB1097872 A GB 1097872A GB 1387033 A GB1387033 A GB 1387033A
Authority
GB
United Kingdom
Prior art keywords
grains
silver halide
emulsion
fogged
developer
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
GB1097872A
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 GB1387033A publication Critical patent/GB1387033A/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

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

1387033 Photographic silver halide emulsion EASTMAN KODAK CO 9 March 1972 [10 March 1971] 10978/72 Heading G2C An unfogged photographic silver halide emulsion of which the halide comprises more than 50 mole % of chloride and of which the grains contain internal physical sites (i.e. sites inside grains produced by. methods which do not result in the occlusion of dopants within the grains) for the deposition of photolytic silver, and is such that a coating thereof containing 200 mg of silver per square foot gives, when tested by processes B, C and D specified in the disclosure, a maximum density which is less than 0.3 in Process B, a maximum density greater than 1.0 in Process C and a relative speed in Process D which is less than the relative speed obtained in Process C. The emulsion may be surface chemically sensitized, contain a fogging agent e.g. a hydrazine or an N-substituted cycloammonium salt such as 2- methyl-3-[3-(p-sulphophenylhydrazono)propyl] benzothiazolium bromide, or contain a polymeric latex (copoly methyacrylate-sulphopropyl acrylate- 2-acetoacetoxyethyl methacrylate in Ex 6). The emulsion may be imagewise exposed, the unexposed grains may be selectively surface-fogged and treated with a surface-developer to develop the surface-fogged grains to produce a direct-positive image. The unexposed grains may be fogged by exposing overall to light during surface-development, by exposing overall to light before or during surface-development after treatment with a surface image stabilizer (i.e. a substance which enables the flash exposed but non-imagewise exposed silver halide grains to become developable in a surface developer) bath, by using an aerial fogging surface developer, or by treatment with a fogging agent. The surface image stabilizer may be a dialkanolamine, cadmium chloride, a developing agent, a tetraazaindene, sodium sulphite or bromide salt.
GB1097872A 1971-03-10 1972-03-09 Photographic direct-positive process and silver halide emulsion therefor Expired GB1387033A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12300671A 1971-03-10 1971-03-10

Publications (1)

Publication Number Publication Date
GB1387033A true GB1387033A (en) 1975-03-12

Family

ID=22406182

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1097872A Expired GB1387033A (en) 1971-03-10 1972-03-09 Photographic direct-positive process and silver halide emulsion therefor

Country Status (7)

Country Link
US (1) US3761266A (en)
AU (1) AU463709B2 (en)
BE (1) BE780539A (en)
BR (1) BR7201361D0 (en)
CA (1) CA970197A (en)
FR (1) FR2128756B1 (en)
GB (1) GB1387033A (en)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890154A (en) * 1969-12-24 1975-06-17 Fuji Photo Film Co Ltd Light-sensitive silver halide photographic materials
JPS5232569B2 (en) * 1972-08-31 1977-08-23
DE2306447C2 (en) * 1973-02-09 1986-10-02 Agfa-Gevaert Ag, 5090 Leverkusen Photographic recording material
DE2308239C2 (en) * 1973-02-20 1984-09-13 Agfa-Gevaert Ag, 5090 Leverkusen Direct positive photographic recording material
DE2332802C2 (en) * 1973-06-28 1984-09-20 Agfa-Gevaert Ag, 5090 Leverkusen Direct positive photographic recording material
DE2416814A1 (en) * 1974-04-06 1975-10-16 Agfa Gevaert Ag DIRECT POSITIVE PHOTOGRAPHIC MATERIAL
JPS51135528A (en) * 1975-05-19 1976-11-24 Fuji Photo Film Co Ltd Spectrally sensitized silver halide photographic emulsions
DE2534011A1 (en) * 1975-07-30 1977-02-17 Agfa Gevaert Ag PROCESS FOR PRODUCING SILVER HALOGENIDE EMULSIONS
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
DE2746965A1 (en) * 1977-10-19 1979-04-26 Agfa Gevaert Ag PROCESS FOR PRODUCING DIRECT POSITIVE PHOTOGRAPHIC IMAGES
US4268621A (en) * 1978-07-29 1981-05-19 Konishiroku Photo Industry Co., Ltd. Direct positive photographic material
JPS5565945A (en) * 1978-11-14 1980-05-17 Konishiroku Photo Ind Co Ltd Direct positive silver halide photographic material
JPS6055820B2 (en) * 1979-03-26 1985-12-06 コニカ株式会社 Direct positive silver halide photographic material
JPS5870223A (en) * 1981-10-22 1983-04-26 Konishiroku Photo Ind Co Ltd Formation of direct positive image
JPS58108533A (en) * 1981-12-02 1983-06-28 Konishiroku Photo Ind Co Ltd Silver halide color photosensitive material
JPS58120248A (en) * 1982-01-12 1983-07-18 Konishiroku Photo Ind Co Ltd Formation of direct positive image
DE3586719T2 (en) * 1984-12-30 1993-03-25 Konishiroku Photo Ind METHOD FOR FORMING A POSITIVE IMAGE.
AU588878B2 (en) * 1985-05-31 1989-09-28 Konishiroku Photo Industry Co., Ltd. Method for forming direct positive color image
JPS63239439A (en) * 1986-11-25 1988-10-05 Konica Corp Direct positive silver halide photographic sensitive material
JPH0690437B2 (en) 1987-12-02 1994-11-14 富士写真フイルム株式会社 Direct positive photographic material
US5190853A (en) * 1988-11-22 1993-03-02 Fuji Photo Film Co., Ltd. Silver halide color photosensitive material
JP2873852B2 (en) 1990-03-03 1999-03-24 コニカ株式会社 Silver halide photographic material
DE69012990T2 (en) * 1990-07-27 1995-03-09 Agfa Gevaert Nv Photosensitive silver halide material for the production of direct positive images.
JP3041736B2 (en) * 1991-11-01 2000-05-15 コニカ株式会社 Silver halide photographic material
JPH05165139A (en) * 1991-12-17 1993-06-29 Konica Corp Dye image forming method
EP0650087B1 (en) * 1993-08-31 2000-01-26 Konica Corporation Silver halide photographic light sensitive material
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 (4)

* 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
FR1484742A (en) * 1965-04-30 1967-06-16 Agfa Gevaert Nv Method for producing direct positive photographic images
US3574625A (en) * 1967-04-07 1971-04-13 Eastman Kodak Co Photographic systems with polyvalent metal ions contiguous to the silver halide grains

Also Published As

Publication number Publication date
BE780539A (en) 1972-07-03
AU3976472A (en) 1973-09-13
FR2128756B1 (en) 1976-01-16
AU463709B2 (en) 1975-07-18
BR7201361D0 (en) 1973-06-05
DE2211771B2 (en) 1977-01-27
DE2211771A1 (en) 1972-09-28
FR2128756A1 (en) 1972-10-20
US3761266A (en) 1973-09-25
CA970197A (en) 1975-07-01

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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