GB1282084A - Process for the preparation of direct positive photographic silver halide emulsions - Google Patents

Process for the preparation of direct positive photographic silver halide emulsions

Info

Publication number
GB1282084A
GB1282084A GB48430/70A GB4843070A GB1282084A GB 1282084 A GB1282084 A GB 1282084A GB 48430/70 A GB48430/70 A GB 48430/70A GB 4843070 A GB4843070 A GB 4843070A GB 1282084 A GB1282084 A GB 1282084A
Authority
GB
United Kingdom
Prior art keywords
silver halide
emulsion
direct
emulsions
per mole
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
GB48430/70A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB1282084A publication Critical patent/GB1282084A/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
    • G03C1/48523—Direct positive emulsions prefogged characterised by the desensitiser
    • G03C1/4853—Direct positive emulsions prefogged characterised by the desensitiser polymethine dyes
    • 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

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)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Abstract

1282084 Preparation of direct-positive silver halide emulsions E I DU PONT DE NEMOURS & CO 12 Oct 1970 [13 Oct 1969] 48430/70 Heading G2C A direct-positive photographic silver halide emulsion is prepared by (a) adding 3À33-15 millimoles of a water-soluble inorganic iodide per mole of silver halide to a redispersion in an aqueous medium of a precipitated, ripened and washed water-permeable colloid silver chlorobromide or silver bromide emulsion, and (b) adjusting the pH to 5-9 and digesting the emulsion at 43 ‹ to 66‹C. for 15 to 60 minutes, there being added during digestion of the emulsion per mole of silver halide 0À00033g to 12À0g of an amine borane as a fogging agent and after digestion is complete 10-100 mg of an optical sensitizing dye per mole of silver halide. The colloid is preferably gelatine. The amine borane may have the formula: - R 1 R 2 R 3 N: BH 3 wherein R 1 is 1-20C alkyl and R 2 and R 3 are each H or 1-20C alkyl. The sensitizing dye may be 4 (1, 3, 3-trimethylindolidinyl)-#-ethylidene-(3-methyl-1 p-sulphophenyl)-5-pyrazolone, 2-(3-ethyl-thiazolylidenyl)- #-ethylidene-3-carboxymethyl- 5-rhodanine, 4- (p-dimethylamino benzylidenyl)-3-methyl-1-psulphophenyl-5-pyrazolone, 1, 3, 3-trimethyl- 3'-ethiodide-oxacarbocyanine or 3, 3'-(2- carboxyethyl)-5, 6, 5', 6'-tetramethyl benzoxazole carbocyanine. These direct-positive emulsions have increased speed over known emulsions. Reference is made to Specifications 1, 097, 999 and 1, 076, 296.
GB48430/70A 1969-10-13 1970-10-12 Process for the preparation of direct positive photographic silver halide emulsions Expired GB1282084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86597669A 1969-10-13 1969-10-13

Publications (1)

Publication Number Publication Date
GB1282084A true GB1282084A (en) 1972-07-19

Family

ID=25346643

Family Applications (1)

Application Number Title Priority Date Filing Date
GB48430/70A Expired GB1282084A (en) 1969-10-13 1970-10-12 Process for the preparation of direct positive photographic silver halide emulsions

Country Status (5)

Country Link
US (1) US3647455A (en)
BE (1) BE757384A (en)
DE (1) DE2049797C3 (en)
FR (1) FR2065337A5 (en)
GB (1) GB1282084A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1427525A (en) * 1972-07-13 1976-03-10 Agfa Gevaert Directpositive silver halide emulsions
DE2260117A1 (en) * 1972-12-08 1974-06-12 Agfa Gevaert Ag PHOTOGRAPHIC MATERIAL FOR THE PRODUCTION OF DIRECT POSITIVE IMAGES
US4045228A (en) * 1972-12-08 1977-08-30 Agfa-Gevaert N.V. Direct positive emulsions containing fogged, monodispersed silver halide grains having more than 10 mile % iodide
DE2263246A1 (en) * 1972-12-23 1974-07-04 Agfa Gevaert Ag PHOTOGRAPHIC MATERIAL FOR THE PRODUCTION OF DIRECT POSITIVE PHOTOGRAPHIC IMAGES
US3871887A (en) * 1974-01-02 1975-03-18 Eastman Kodak Co Photothermographic composition, element and process
DE69424981T2 (en) * 1993-10-20 2001-01-11 Agfa Gevaert Nv High-resolution radiographic recording element
US5411855A (en) * 1993-12-16 1995-05-02 Eastman Kodak Company Photographic element exhibiting improved speed and stability

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249440A (en) * 1963-03-15 1966-05-03 Du Pont Radiation-sensitive elements and their preparation
US3367780A (en) * 1963-08-19 1968-02-06 Eastman Kodak Co Direct-print photographic silver halide emulsions
US3361564A (en) * 1964-08-27 1968-01-02 Du Pont Amine borane as fogging agent in direct positive
GB1112941A (en) * 1965-01-02 1968-05-08 Smiths Industries Ltd Improvements in or relating to scanning apparatus
US3445235A (en) * 1965-07-15 1969-05-20 Du Pont Rhodium and iridium salts as anti-kinking agent in direct positive silver halide emulsions
US3510348A (en) * 1966-03-11 1970-05-05 Eastman Kodak Co Direct positive recording film
US3505070A (en) * 1966-03-11 1970-04-07 Eastman Kodak Co Direct positive emulsion containing dimethine dyes containing a 2-aromatically substituted indole nucleus
US3501312A (en) * 1968-07-22 1970-03-17 Eastman Kodak Co Direct positive silver halide emulsions containing trimethine cyanine dyes

Also Published As

Publication number Publication date
FR2065337A5 (en) 1971-07-23
BE757384A (en) 1971-04-13
US3647455A (en) 1972-03-07
DE2049797B2 (en) 1973-04-19
DE2049797C3 (en) 1973-11-08
DE2049797A1 (en) 1971-05-19

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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