GB523661A - Improvements in or relating to the production of photographic silver halide emulsions - Google Patents
Improvements in or relating to the production of photographic silver halide emulsionsInfo
- Publication number
- GB523661A GB523661A GB35593/38A GB3559338A GB523661A GB 523661 A GB523661 A GB 523661A GB 35593/38 A GB35593/38 A GB 35593/38A GB 3559338 A GB3559338 A GB 3559338A GB 523661 A GB523661 A GB 523661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silver halide
- charge
- emulsion
- carrier
- excess
- 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
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
- G03C1/04—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with macromolecular additives; with layer-forming 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)
- Paper (AREA)
Abstract
523,661. Photographic silver halide emulsion. CZEIJA, O., and LIERG, F. Dec. 6, 1938, Nos. 35593 and 35594. Convention dates, Dec. 6, 1937 and June 20, 1938. [Class 98 (ii)] In the production of silver halide emulsions, the carrier colloid has added thereto or produced therein colloidal silver halide having a particle charge opposite to the charge of the carrier colloid without completely neutralizing the charge of the carrier colloid. The carrier colloid may be a cellulose derivative or a polymerization or condensation product such as polyvinyl alcohol or polyacrylic acid, or a mixture of one or more of such substances. If the carrier colloid has a negative particle charge, the components for forming the silver halide are so added that there is an excess of the silver compound over the halogen compound at each instant during the formation of the silver halide and the silver compound remains in excess at the completion of the operation. The excess controls the resulting gradation. Conversely, if the carrier colloid has a positive particle charge, the halogen compound is maintained in excess. Part of the silver compound may be replaced by a compound or compounds of another metal or metals, for example thallium, which impart a positive charge to the silver halide. Examples of carrier colloids are partially etherified cellulose or partially saponified cellulose esters. A negative charge may be increased by treatment with alkalis and a positive charge increased by treatment with acids. Suitable solvents in the case of cellulose acetate are methyl and other alcohols, acetone, diacetone alcohol, chlorinated hydrocarbons and mixtures of acetone and water. Positive charges may be reduced by addition of acid dyes or colloidal metals, and negative charges by the addition of basic dyes or colloidal oxides or hydroxides. The support may be glass, metal, paper, celluloid or cellulose acetate. No support need be employed. One or more emulsion layers and filter or other intermediate layers may be provided. A small amount of high-boiling solvent, for example, diacetone alcohol, may be added to promote adhesion of the emulsion to the supporting layer. The emulsion may be used for sound recording and may be colour sensitized. In an example, cellulose acetate is partially saponified with alkali and the emulsion either prepared directly from the saponification solution or after washing and re-solution.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT212869X | 1937-12-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB523661A true GB523661A (en) | 1940-07-19 |
Family
ID=3669717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB35593/38A Expired GB523661A (en) | 1937-12-06 | 1938-12-06 | Improvements in or relating to the production of photographic silver halide emulsions |
Country Status (4)
Country | Link |
---|---|
CH (1) | CH212869A (en) |
FR (1) | FR847048A (en) |
GB (1) | GB523661A (en) |
NL (1) | NL56880C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2869421A (en) * | 1957-07-30 | 1959-01-20 | Pokolic Ivan | Still picture attachment for moving picture projectors |
-
0
- NL NL56880D patent/NL56880C/xx active
-
1938
- 1938-11-28 CH CH212869D patent/CH212869A/en unknown
- 1938-12-05 FR FR847048D patent/FR847048A/en not_active Expired
- 1938-12-06 GB GB35593/38A patent/GB523661A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL56880C (en) | |
FR847048A (en) | 1939-10-02 |
CH212869A (en) | 1940-12-31 |
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