GB498290A - Improvements in sensitised photographic emulsions - Google Patents
Improvements in sensitised photographic emulsionsInfo
- Publication number
- GB498290A GB498290A GB2505138A GB2505138A GB498290A GB 498290 A GB498290 A GB 498290A GB 2505138 A GB2505138 A GB 2505138A GB 2505138 A GB2505138 A GB 2505138A GB 498290 A GB498290 A GB 498290A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dyes
- cyanine dyes
- combination
- alkyl
- carbocyanines
- 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
- G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
- G03C1/08—Sensitivity-increasing substances
- G03C1/28—Sensitivity-increasing substances together with supersensitising substances
- G03C1/29—Sensitivity-increasing substances together with supersensitising substances the supersensitising mixture being solely composed of dyes ; Combination of dyes, even if the supersensitising effect is not explicitly disclosed
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)
- Developing Agents For Electrophotography (AREA)
Abstract
498,290. Sensitizing dyestuffs for photographic emulsions. KODAK, Ltd. (Eastman Kodak Co.) March 25, 1937, No. 25051/38. Divided. out of 498,031. Drawings to Specification. [Class 98 (ii)] A gelatino-silver halide emulsion contains a pseudocyanine and a carbocyanine containing oxygen, sulphur or selenium, the combination yielding a supersensitizing effect. Examples of pseudocyanines to be used include the 2 : 2<1>- cyanine dyes, the thia-2<1>-cyanine dyes, the selena-2<1>-cyanine dyes, the benzthia-2<1>-cyanine dyes, the oxazolo-2<1>-cyanine dyes, the thiazolo- 2<1>-cyanine dyes containing substituted alkyl or phenyl groups, the alkyl being preferably of one to four carbon atoms. The nuclei may contain simple substituents alkyl, chloro, alkoxy or amino groups. The examples of the carbocyanines include the 8-alkylthiacarbocyanines, the 8-alkylselenacarbocyanines, the 8-alkyldibenzthiacarbocyanines, the 8-alkylthiaselenacarbocyanines, the 8-alkylselenabenzthiacarbocyanines, the 8-alkylbenzthiacarbocyanines, the oxathiazolocarbocyanines, the 41- alkyloxathiazolocarbocyanines, the 41-phenyloxathiazolocarbocyanines, the 41 - alkyloxaselenazolocarbocyanines and the 4<1>-phenyloxaselenazolo-carbocyanines. Numerous results of experiments determining the speed figures of dyes and combinations thereof are included in the Specification. The specified test for indicating supersensitization comprises comparing the sensitivity of the individual dyes with that of a mixture of the dyes. The combination may comprise more than two of the dyes. The supersensitizing combination is either applied to the emulsion before coating or applied by bathing the coated emulsion. U.S.A. Specifications 1,969,446 and 2,005,411 are referred to. The Provisional Specification also contains subject-matter which is described in Specifications 408,273, [Group IV], 498,031, 498,289, and 498,291.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2505138A GB498290A (en) | 1937-03-25 | 1937-03-25 | Improvements in sensitised photographic emulsions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2505138A GB498290A (en) | 1937-03-25 | 1937-03-25 | Improvements in sensitised photographic emulsions |
Publications (1)
Publication Number | Publication Date |
---|---|
GB498290A true GB498290A (en) | 1938-12-28 |
Family
ID=10221435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2505138A Expired GB498290A (en) | 1937-03-25 | 1937-03-25 | Improvements in sensitised photographic emulsions |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB498290A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1946307A1 (en) * | 1968-09-12 | 1970-05-14 | Fuji Photo Film Co Ltd | Photographic silver halide emulsion |
-
1937
- 1937-03-25 GB GB2505138A patent/GB498290A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1946307A1 (en) * | 1968-09-12 | 1970-05-14 | Fuji Photo Film Co Ltd | Photographic silver halide emulsion |
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