GB691715A - Improvements in or relating to photographic emulsions - Google Patents

Improvements in or relating to photographic emulsions

Info

Publication number
GB691715A
GB691715A GB19181/51A GB1918151A GB691715A GB 691715 A GB691715 A GB 691715A GB 19181/51 A GB19181/51 A GB 19181/51A GB 1918151 A GB1918151 A GB 1918151A GB 691715 A GB691715 A GB 691715A
Authority
GB
United Kingdom
Prior art keywords
emulsion
salt
tetracarboxymethylethylenediamine
silver
digestion
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
GB19181/51A
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 GB691715A publication Critical patent/GB691715A/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)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Laminated Bodies (AREA)

Abstract

691,715. Photographic emulsions. DU PONT DE NEMOURS & CO., E. I. Aug. 14, 1951 [Sept. 6, 1950], No. 19181/51. Class 98 (ii). A photographic colloid silver halide emulsion has an enhanced light-sensitivity due to the presence of 0.097 to 0.91 per cent by weight based on the weight of silver of tetracarboxymethylethylenediamine or of an alkali metal, ammonium, or substituted ammonium salt thereof, e.g. a salt derived from diethylamine, trimethylamine, cyclohexylamine, tetraethyl- or tetramethyl - ammonium hydroxide, guanidine, diphenylguanidine, or biguanidine. The compound may be added during the initial precipitation of the silver halide, at the beginning, during, or end of ripening, or at some other point prior to the end of final digestion. The emulsion may also contain sensitizing cyanine or styryl dyes. In example 1, the sodium salt of tetracarboxymethylethylenediamine is added at the start of the digestion of a washed gelatino silver iodobromide emulsion. An orthochromatic sensitizing dye, chrome alum, potassium bromide, and saponin may be added, and the emulsion coated on a cellulose acetate support. Example 3 is similar, and in example 2, the emulsion is a silver chlorobromide emulsion, and the dye a panchromatic sensitizer, and the potassium bromide is replaced by potassium chloride. In the examples, comparisons are drawn between the speed, gamma, and fog values with and without the sodium salt of tetracarboxymethylethylenediamine, and in example 3 it is shown that addition of such salt after digestion is ineffective. The emulsion may contain a sulphur sensitizer, e.g. allylthiourea, a thiocyanate, sodium thiosulphate, or sodium hyposulphite. The emulsion binder may be gelatine, agar-agar, a polyglycuronic acid, zein, collodion, a substantially hydrolysed cellulose acetate, a cellulose glycollate or lactate, an alkali metal salt of a cellulose phthalate, polyvinyl alcohol, partially hydrolysed polyvinyl acetate (including vinyl acetatestyrene and vinyl acetate-maleic acid interpolymers), or a water-soluble polyvinyl acetal. Specifications 376,746, 513,471, 519,895, 527,283 and 537,961 are referred to.
GB19181/51A 1950-09-06 1951-08-14 Improvements in or relating to photographic emulsions Expired GB691715A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US183463A US2666700A (en) 1950-09-06 1950-09-06 Process of preparing a light sensitive silver halide emulsion

Publications (1)

Publication Number Publication Date
GB691715A true GB691715A (en) 1953-05-20

Family

ID=22672894

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19181/51A Expired GB691715A (en) 1950-09-06 1951-08-14 Improvements in or relating to photographic emulsions

Country Status (2)

Country Link
US (1) US2666700A (en)
GB (1) GB691715A (en)

Cited By (5)

* 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
US5491055A (en) * 1994-12-23 1996-02-13 Eastman Kodak Company Silver halide photographic emulsions prepared and sensitized in the presence of sulfodihydroxy aryl compounds
US5629144A (en) * 1994-12-23 1997-05-13 Eastman Kodak Company Epitaxially sensitized tabular grain emulsions containing speed/fog mercaptotetrazole enhancing addenda
US5631126A (en) * 1994-12-23 1997-05-20 Eastman Kodak Company Epitaxially sensitized tabular grain emulsions containing speed/fog sulfodihydroxy aryl enhancing addenda

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2843487A (en) * 1955-02-02 1958-07-15 Eastman Kodak Co Aqueous gelatin coating compositions and their application
US3253919A (en) * 1962-06-12 1966-05-31 Eastman Kodak Co Sensitizers for photographic silver halide emulsions
US3458316A (en) * 1966-05-26 1969-07-29 Gaf Corp Light sensitive silver halide emulsions
BE794188A (en) * 1972-01-26 1973-07-18 Agfa Gevaert Nv IMPROVED PHOTOGRAPHIC SILVER HALOGENIDE EMULSIONS
JPS6054661B2 (en) * 1981-05-28 1985-11-30 富士写真フイルム株式会社 photographic material
JPS6289953A (en) * 1985-10-16 1987-04-24 Fuji Photo Film Co Ltd Silver halide emulsion

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2239284A (en) * 1934-12-28 1941-04-22 Hall Lab Inc Treatment of photographic films and plates
DE705772C (en) * 1936-06-25 1941-05-14 I G Farbenindustrie Akt Ges Photographic treatment baths
BE421930A (en) * 1936-06-25
US2256390A (en) * 1936-08-19 1941-09-16 Eastman Kodak Co Method of preventing precipitation of alkaline-earth metal salts in gelatin
BE430669A (en) * 1937-10-29

Cited By (5)

* 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
US5491055A (en) * 1994-12-23 1996-02-13 Eastman Kodak Company Silver halide photographic emulsions prepared and sensitized in the presence of sulfodihydroxy aryl compounds
US5629144A (en) * 1994-12-23 1997-05-13 Eastman Kodak Company Epitaxially sensitized tabular grain emulsions containing speed/fog mercaptotetrazole enhancing addenda
US5631126A (en) * 1994-12-23 1997-05-20 Eastman Kodak Company Epitaxially sensitized tabular grain emulsions containing speed/fog sulfodihydroxy aryl enhancing addenda

Also Published As

Publication number Publication date
US2666700A (en) 1954-01-19

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