GB664230A - Improvements in sensitive photographic emulsions - Google Patents

Improvements in sensitive photographic emulsions

Info

Publication number
GB664230A
GB664230A GB29568/49A GB2956849A GB664230A GB 664230 A GB664230 A GB 664230A GB 29568/49 A GB29568/49 A GB 29568/49A GB 2956849 A GB2956849 A GB 2956849A GB 664230 A GB664230 A GB 664230A
Authority
GB
United Kingdom
Prior art keywords
emulsion
bis
speed
sulphide
aminoethyl
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
GB29568/49A
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 GB664230A publication Critical patent/GB664230A/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
    • G03C1/09—Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising

Abstract

664,230. Photographic emulsions. KODAK, Ltd. Nov. 18, 1949 [Nov. 18, 1948], No. 29568/49. Class 98 (ii). The speed of a light-sensitive silver halide emulsion is increased by the incorporation of bis - (p - aminoethyl) - sulphide, a non-desensitizing water-soluble salt thereof, or bis- (y - diethylaminopropyl) - disulphide. The emulsion may also contain a sulphur sensitizer incorporated before, simultaneously with, or after the speed-increasing compound, and may also contain an optical sensitizer. The compound 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 example 1, the effect on the fog, gamma,and speed of a gelatine emulsion peptized with a gelatine derivative as described in Specification 649,545 of additions of allyl thiourea, of bis-(#-aminoethyl)-sulphide dihydrochloride, and of both allyl thiourea and bis - (# - aminoethyl) - sulphide dihydrochloride is shown in a table. In example 2, a similar comparison is made of the effect of additions of allyl thiourea, bis-(y-diethylaminopropyl)- disulphide on gelatine and polyvinyl alcohol silver bromiodide emulsions. The speed increase is effective at a fairly low pH, such as 6.0, and the increase obtained with a sulphursensitized emulsion is considerably greater than would be expected from the speed increases obtained by the use of the individual sensitizers. The emulsion binder may also be a copolymer of polyvinyl alcohol or a partially hydrolysed cellulose ester (e.g. cellulose acetate). Specification 235,211, [Claas 98 (ii)], also is referred to.
GB29568/49A 1948-11-18 1949-11-18 Improvements in sensitive photographic emulsions Expired GB664230A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US60817A US2521926A (en) 1948-11-18 1948-11-18 Chemical sensitization of photographic emulsions

Publications (1)

Publication Number Publication Date
GB664230A true GB664230A (en) 1952-01-02

Family

ID=22031932

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29568/49A Expired GB664230A (en) 1948-11-18 1949-11-18 Improvements in sensitive photographic emulsions

Country Status (4)

Country Link
US (1) US2521926A (en)
BE (1) BE492188A (en)
FR (1) FR1004983A (en)
GB (1) GB664230A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728668A (en) * 1952-12-05 1955-12-27 Du Pont Photographic emulsions containing a 1,2-dithiolane

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE523959A (en) * 1952-11-08
JPS5330331A (en) * 1976-09-02 1978-03-22 Konishiroku Photo Ind Co Ltd Treatment of silver halide photographic photosensitive material
JPS5827486B2 (en) * 1977-06-03 1983-06-09 富士写真フイルム株式会社 silver halide photographic emulsion
JPS58125612A (en) * 1982-01-14 1983-07-26 Konishiroku Photo Ind Co Ltd Preparation of silver halide emulsion
JPS59188641A (en) 1983-04-11 1984-10-26 Fuji Photo Film Co Ltd Silver halide photographic emulsion
EP0216973B1 (en) * 1985-09-24 1989-11-23 EASTMAN KODAK COMPANY (a New Jersey corporation) Photographic elements and compositions containing cyclic thioethers
JPH07113746B2 (en) * 1988-07-12 1995-12-06 富士写真フイルム株式会社 Silver halide photographic light-sensitive material
US5582957A (en) * 1995-03-28 1996-12-10 Eastman Kodak Company Resuspension optimization for photographic nanosuspensions
US5792601A (en) 1995-10-31 1998-08-11 Eastman Kodak Company Composite silver halide grains and processes for their preparation

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
US2728668A (en) * 1952-12-05 1955-12-27 Du Pont Photographic emulsions containing a 1,2-dithiolane

Also Published As

Publication number Publication date
FR1004983A (en) 1952-04-04
US2521926A (en) 1950-09-12
BE492188A (en)

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