GB1221137A - Photographic silver halide emulsions - Google Patents

Photographic silver halide emulsions

Info

Publication number
GB1221137A
GB1221137A GB4002668A GB4002668A GB1221137A GB 1221137 A GB1221137 A GB 1221137A GB 4002668 A GB4002668 A GB 4002668A GB 4002668 A GB4002668 A GB 4002668A GB 1221137 A GB1221137 A GB 1221137A
Authority
GB
United Kingdom
Prior art keywords
silver halide
emulsion
chelating agent
photographic
acetic acid
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
GB4002668A
Inventor
Robin Duff Kerr
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.)
Ilford Imaging UK Ltd
Original Assignee
Ilford Ltd
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 Ilford Ltd filed Critical Ilford Ltd
Priority to GB4002668A priority Critical patent/GB1221137A/en
Publication of GB1221137A publication Critical patent/GB1221137A/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
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08—Sensitivity-increasing substances
    • G03C1/10—Organic substances
    • 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
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

1,221,137. Photographic silver halide emulsions. ILFORD Ltd. Aug. 20, 1969 [Aug.21, 1968], No.40026/68. Heading G2C. A process for the production of a photographic colloid silver halide emulsion comprises forming the silver halide grains in the presence of a metal chelating agent which is diethylene triamine- N, N , N<SP>1</SP>, N<SP>11</SP>, N<SP>11</SP>-penta-acetic acid, triethylene tetramine-N; N , N1 , N<SP>11</SP>, N<SP>111</SP>, N<SP>111</SP>-hexa-acetic acid or 1, 2-diaminocydohexane-N, N, N<SP>1</SP>, N<SP>1</SP>- tetra-acetic acid. Preferably at least 3g. of the said chelating agent per gram mol of silver is present during the formation of the silver halide grains. The silver halide emulsions of the present invention have enhanced light-sensitivity. However if the chelating agent is added at a later stage in the emulsion making process no sensitivity enhancement of the resulting silver halide emulsion is obtained. Specification 1, 221, 138 discloses a process for the production of a photographic emulsion having a reduced tendency to develop desensitized spots due to inclusions in the emulsion, whichcomprises adding to the emulsion, after the chemical sensitization of the emulsion, but before it is coated on a support to form a photographic material, a metal chelating agent as defined above.
GB4002668A 1968-08-21 1968-08-21 Photographic silver halide emulsions Expired GB1221137A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4002668A GB1221137A (en) 1968-08-21 1968-08-21 Photographic silver halide emulsions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4002668A GB1221137A (en) 1968-08-21 1968-08-21 Photographic silver halide emulsions

Publications (1)

Publication Number Publication Date
GB1221137A true GB1221137A (en) 1971-02-03

Family

ID=10412795

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4002668A Expired GB1221137A (en) 1968-08-21 1968-08-21 Photographic silver halide emulsions

Country Status (1)

Country Link
GB (1) GB1221137A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4873184A (en) * 1988-02-05 1989-10-10 Minnesota Mining And Manufacturing Company Supersensitization of silver halide photothermographic emulsions
US5013622A (en) * 1986-12-12 1991-05-07 Minnesota Mining And Manufacturing Company Supersensitization of silver halide emulsions
EP0943956A1 (en) * 1998-03-18 1999-09-22 Imation Corp. Radiographic material having antispot protection and improved speed to Dmin ratio

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5013622A (en) * 1986-12-12 1991-05-07 Minnesota Mining And Manufacturing Company Supersensitization of silver halide emulsions
US4873184A (en) * 1988-02-05 1989-10-10 Minnesota Mining And Manufacturing Company Supersensitization of silver halide photothermographic emulsions
JPH024241A (en) * 1988-02-05 1990-01-09 Minnesota Mining & Mfg Co <3M> Silver halide thermal development type photographic emulsion
EP0943956A1 (en) * 1998-03-18 1999-09-22 Imation Corp. Radiographic material having antispot protection and improved speed to Dmin ratio

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