GB663019A - Improvements in sensitive photographic emulsions - Google Patents

Improvements in sensitive photographic emulsions

Info

Publication number
GB663019A
GB663019A GB29566/49A GB2956649A GB663019A GB 663019 A GB663019 A GB 663019A GB 29566/49 A GB29566/49 A GB 29566/49A GB 2956649 A GB2956649 A GB 2956649A GB 663019 A GB663019 A GB 663019A
Authority
GB
United Kingdom
Prior art keywords
emulsion
polyamine
speed
salt
sulphur
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
GB29566/49A
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.)
Kodak Ltd
Original Assignee
Kodak 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 Kodak Ltd filed Critical Kodak Ltd
Publication of GB663019A publication Critical patent/GB663019A/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

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

Abstract

663,019. Photographic emulsions. KODAK, Ltd. Nov. 18, 1949 [Nov. 18, 1948], No. 29566/49. Class 98 (ii). The speed of a light-sensitive silver halide emulsion is increased by the incorporation of the polyamine spermine, or a non-desensitizing water-soluble salt thereof. The emulsion may also contain a sulphur sensitizer, incorporated before, simultaneously with, or after the polyamine or salt thereof, and may also contain an optical sensitizer. The polyamine or salt may be added during digestion of the emulsion, so that further digestion occurs after the addition. At least one emulsion layer of a colour photographic multilayer material may be so prepared. In examples, comparisons are made between the fog, gamma, and speed values obtained with emulsions with and without spermine, allyl thiourea being used as sulphur sensitizer in the first example and the emulsion being peptized with a gelatine derivative as described in Specification 649,545 in the second example. The developer used in the second example contains p-methylaminophenol sulphate, hydroquinone, sodium sulphite, sodium bisulphite, sodium carbonate, potassium bromide, and citric acid. The speed increase is effective at a fairly low pH, such as 6.0, and the increase obtained with a sulphur sensitized emulsion is considerably greater than would be expected from the speed increases obtained by the use of the individual sensitizers. The emulsion binder may be gelatine, polyvinyl alcohol, a copolymer thereof, or a partially hydrolyzed cellulose ester (e.g. cellulose acetate). Specification 235,211, [Class 98 (ii)], is referred to.
GB29566/49A 1948-11-18 1949-11-18 Improvements in sensitive photographic emulsions Expired GB663019A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US60815A US2521925A (en) 1948-11-18 1948-11-18 Chemical sensitization of photographic emulsions

Publications (1)

Publication Number Publication Date
GB663019A true GB663019A (en) 1951-12-12

Family

ID=22031923

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29566/49A Expired GB663019A (en) 1948-11-18 1949-11-18 Improvements in sensitive photographic emulsions

Country Status (2)

Country Link
US (1) US2521925A (en)
GB (1) GB663019A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972720C (en) * 1952-11-08 1959-09-10 Eastman Kodak Co Sensitized photographic material

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2740713A (en) * 1952-04-26 1956-04-03 Warren Joel Sensitization of photographic emulsions
JPS62175753A (en) * 1986-01-29 1987-08-01 Fuji Photo Film Co Ltd Color image forming method
JPH08190199A (en) 1994-10-18 1996-07-23 Minnesota Mining & Mfg Co <3M> Photosensitive element
US5468588A (en) 1994-10-18 1995-11-21 Minnesota Mining And Manufacturing Company Process for manufacturing diffusion transfer printing plates
US5582957A (en) * 1995-03-28 1996-12-10 Eastman Kodak Company Resuspension optimization for photographic nanosuspensions
US5763152A (en) * 1995-03-31 1998-06-09 Fuji Photo Film Co., Ltd. Silver halide photographic light-sensitive material
US6040129A (en) * 1999-04-09 2000-03-21 Eastman Kodak Company Photographic emulsion having an improved speed, photographic element containing said emulsion, and method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB496049A (en) * 1937-04-19 1938-11-21 Ig Farbenindustrie Ag Improved manufacture of light-sensitive photographic preparations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972720C (en) * 1952-11-08 1959-09-10 Eastman Kodak Co Sensitized photographic material

Also Published As

Publication number Publication date
US2521925A (en) 1950-09-12

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