US1696830A - Light-sensitive silver halide emulsions and process of making the same - Google Patents

Light-sensitive silver halide emulsions and process of making the same Download PDF

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Publication number
US1696830A
US1696830A US191928A US19192827A US1696830A US 1696830 A US1696830 A US 1696830A US 191928 A US191928 A US 191928A US 19192827 A US19192827 A US 19192827A US 1696830 A US1696830 A US 1696830A
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United States
Prior art keywords
silver halide
sensitive silver
halide emulsions
making
light
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Expired - Lifetime
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US191928A
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Wulff Peter
Wendt Bruno
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IG Farbenindustrie AG
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IG Farbenindustrie AG
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    • 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
    • G03C1/34—Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression

Definitions

  • rmnn mm or sramnne, m1) ammo wnnnr, or DESSAU, GERMANY, ASSIGN- ons T071. e. rmnnmnnsrnm nx'rmnensnnnscm'r, or FRANKFORT-ON-THE- MAIN, GER-Hm.
  • the present invention relates to light sensitive silver halide emulsions and to a procass of making the same. Its object is to obtain valuable lightsensitive emulsions from foggy gelatines.
  • the ripening process is very important in the manufacture of sensitive silver halide emulsions.
  • the sensitiveness attained thereby depends to a great extent on the qualities of the colloid employed, for instance of the gelatin.
  • the ripening capacity of a gelatin may be enhanced by adding substances, the nature and quantity of which depends upon the kind of emulsifying process which is used. These substances are sulphur compounds of a certain constitution, ammonia and others. In this way it is possible to make use of badly ripening gelatin for producing emulsions of the highest sensitivity.
  • gelatin cannot be used for making sensitive silver halide emulsions because they produce fog before the emulsion has ripened to the sensitiveness desired. Such gelatins have not been applicable hitherto for the production of photographic silver halide emulsion, or they have had to be specially treated before use.
  • such unsuitable gelatins may be used for making clear emulsions of the highest sensitiveness by adding to the emulsion or to the materials from which it is made, one or more substances which prevent fogging.
  • Appropriate additions for this purpose are certain products of decomposition of proteins which are sometimes incorporated in small quantity in the gelatin, e. g. hist-idine. Investigation has shown that the tendency towards fogging of many sorts of gelatin in the ripening process is due to the complete or partial lack of these substances which prevent fog.
  • the gelatin may be enriched during its manufacture in its content of the efficacious substances or these latter may be produced separately in order to serve as additions to the colloid before the emulsion is made or to the emulsion in any step of its manufacture or when it is poured on to the support of the emulsionlayer.
  • a sensitive silver halide emulsion manufactured according to one of the known processes with a certain sort of gelatin showed considerable fog and little sensitivity.
  • 0.1-0.4 per cent of nitrobenziminazole a clear and highly sensitive emulsion is obtained.

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  • 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)
  • Peptides Or Proteins (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Description

Patented 25, 1928.
' UNITED STATES PATENT OFFICE.
rmnn mm, or sramnne, m1) ammo wnnnr, or DESSAU, GERMANY, ASSIGN- ons T071. e. rmnnmnnsrnm nx'rmnensnnnscm'r, or FRANKFORT-ON-THE- MAIN, GER-Hm.
LIGHT-SENSITIVE SILVER HALIDE EMULSIONS AND PROCESS OF MAKING THE SAME.
No Drawing. Application filed Kay 16, 1927, Serial No. 191,928, and in'Germany May 20, 1926.
The present invention relates to light sensitive silver halide emulsions and to a procass of making the same. Its object is to obtain valuable lightsensitive emulsions from foggy gelatines.
It is known that the ripening process is very important in the manufacture of sensitive silver halide emulsions. The sensitiveness attained thereby depends to a great extent on the qualities of the colloid employed, for instance of the gelatin. The ripening capacity of a gelatin may be enhanced by adding substances, the nature and quantity of which depends upon the kind of emulsifying process which is used. These substances are sulphur compounds of a certain constitution, ammonia and others. In this way it is possible to make use of badly ripening gelatin for producing emulsions of the highest sensitivity.
Many sorts of gelatin, however, cannot be used for making sensitive silver halide emulsions because they produce fog before the emulsion has ripened to the sensitiveness desired. Such gelatins have not been applicable hitherto for the production of photographic silver halide emulsion, or they have had to be specially treated before use.
According to the present invention such unsuitable gelatins may be used for making clear emulsions of the highest sensitiveness by adding to the emulsion or to the materials from which it is made, one or more substances which prevent fogging. Appropriate additions for this purpose are certain products of decomposition of proteins which are sometimes incorporated in small quantity in the gelatin, e. g. hist-idine. Investigation has shown that the tendency towards fogging of many sorts of gelatin in the ripening process is due to the complete or partial lack of these substances which prevent fog. The gelatin may be enriched during its manufacture in its content of the efficacious substances or these latter may be produced separately in order to serve as additions to the colloid before the emulsion is made or to the emulsion in any step of its manufacture or when it is poured on to the support of the emulsionlayer.
Not only the above-mentioned degradation products of proteins, for example iminazolealanine, have been found to be suitable additions to emulsions forthe purpose in question, but generally iminazole and its derivatives have proved to have an excellent fog preventing action. Their suitability for this purpose is probably dueto the fact that the hydrogen-atom of the imino-group can be exchanged for a silver-atom and that adsorption compounds with the silver-salts of the emulsion are formed.
For example, a sensitive silver halide emulsion manufactured according to one of the known processes with a certain sort of gelatin showed considerable fog and little sensitivity. When there is added to the gelatin before or during the making of the emulsion or when the emulsion is poured on the support of the sensitive layer, 0.1-0.4 per cent of nitrobenziminazole a clear and highly sensitive emulsion is obtained.
Having now particularly described and ascertained the nature of our said invent-ion and in what manner the same is to be performed, we declare that what we claim is 1. Process of manufacturing light-sensitive silver halide emulsions characterized by the step of incorporating in the emulsion a compound of the iminazole-series. 2. Process of manufacturing light-sensitive silver halide emulsions characteized by the step of incorporating in the emulsion a compound of the iminazole-series produced by the degradation of proteins.
3. Process of manufacturing light-sensitive silver halide emulsions characterized by the step of enriching the colloid employed in its content of compounds of the. iminazoleseries.
4. Light-sensitive silver halide emulsions in which a compound of the iminazole-series halide emulsions in which colloids are incorporated the content of which of compounds of the in'iinazole-serics is enriched.
In testimony whereof we aflix our signatures.
PETER WULFF. BRUNO WENDT.
US191928A 1926-05-20 1927-05-16 Light-sensitive silver halide emulsions and process of making the same Expired - Lifetime US1696830A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI0028122 1926-05-20

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US1696830A true US1696830A (en) 1928-12-25

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BE (1) BE342528A (en)
GB (1) GB271475A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2699391A (en) * 1950-01-11 1955-01-11 Gen Aniline & Film Corp Synthetic polypeptides of alpha-amino acids as restrainers in photographic emulsions
US3086863A (en) * 1959-01-21 1963-04-23 Du Pont Photographic emulsions containing imidazoles
US4298683A (en) * 1977-12-29 1981-11-03 Agfa-Gevaert Aktiengesellschaft Light-sensitive photographic material
US4469784A (en) * 1981-09-28 1984-09-04 Fuji Photo Film Co., Ltd. Silver halide emulsions
US4643966A (en) * 1985-09-03 1987-02-17 Eastman Kodak Company Emulsions and photographic elements containing ruffled silver halide grains
EP0215612A2 (en) 1985-09-03 1987-03-25 EASTMAN KODAK COMPANY (a New Jersey corporation) Silver halide photographic emulsions with novel grain faces (5)
US4680256A (en) * 1985-09-03 1987-07-14 Eastman Kodak Company Emulsions and photographic elements containing silver halide grains having trisoctahedra crystal faces
US4680254A (en) * 1985-09-03 1987-07-14 Eastman Kodak Company Emulsions and photographic elements containing silver halide grains having hexoctamedral crystal faces
EP0233396A2 (en) * 1985-09-03 1987-08-26 EASTMAN KODAK COMPANY (a New Jersey corporation) Silver halide photographic emulsions with novel grain faces (4)
EP0234090A2 (en) * 1985-09-03 1987-09-02 EASTMAN KODAK COMPANY (a New Jersey corporation) Silver halide photographic emulsions with novel grain faces (1)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147118A (en) * 1961-03-14 1964-09-01 Gen Aniline & Film Corp Fog reduction in photographic silver halide emulsions

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2699391A (en) * 1950-01-11 1955-01-11 Gen Aniline & Film Corp Synthetic polypeptides of alpha-amino acids as restrainers in photographic emulsions
US3086863A (en) * 1959-01-21 1963-04-23 Du Pont Photographic emulsions containing imidazoles
US4298683A (en) * 1977-12-29 1981-11-03 Agfa-Gevaert Aktiengesellschaft Light-sensitive photographic material
US4469784A (en) * 1981-09-28 1984-09-04 Fuji Photo Film Co., Ltd. Silver halide emulsions
US4643966A (en) * 1985-09-03 1987-02-17 Eastman Kodak Company Emulsions and photographic elements containing ruffled silver halide grains
EP0215612A2 (en) 1985-09-03 1987-03-25 EASTMAN KODAK COMPANY (a New Jersey corporation) Silver halide photographic emulsions with novel grain faces (5)
US4680256A (en) * 1985-09-03 1987-07-14 Eastman Kodak Company Emulsions and photographic elements containing silver halide grains having trisoctahedra crystal faces
US4680254A (en) * 1985-09-03 1987-07-14 Eastman Kodak Company Emulsions and photographic elements containing silver halide grains having hexoctamedral crystal faces
EP0233396A2 (en) * 1985-09-03 1987-08-26 EASTMAN KODAK COMPANY (a New Jersey corporation) Silver halide photographic emulsions with novel grain faces (4)
EP0234090A2 (en) * 1985-09-03 1987-09-02 EASTMAN KODAK COMPANY (a New Jersey corporation) Silver halide photographic emulsions with novel grain faces (1)
EP0215612A3 (en) * 1985-09-03 1988-11-30 Eastman Kodak Company Silver halide photographic emulsions with novel grain faces (5)
EP0234090A3 (en) * 1985-09-03 1988-11-30 Eastman Kodak Company Silver halide photographic emulsions with novel grain faces (1)
EP0233396A3 (en) * 1985-09-03 1988-12-28 Eastman Kodak Company Silver halide photographic emulsions with novel grain faces (4)

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Publication number Publication date
GB271475A (en) 1927-11-10
BE342528A (en)

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