GB496116A - Improvements in sensitising silver halide emulsions - Google Patents
Improvements in sensitising silver halide emulsionsInfo
- Publication number
- GB496116A GB496116A GB1151837A GB1151837A GB496116A GB 496116 A GB496116 A GB 496116A GB 1151837 A GB1151837 A GB 1151837A GB 1151837 A GB1151837 A GB 1151837A GB 496116 A GB496116 A GB 496116A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phenyl
- nucleus
- benzoxazole
- ethiodide
- silver halide
- 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
- G03C1/10—Organic substances
- G03C1/12—Methine and polymethine dyes
- G03C1/14—Methine and polymethine dyes with an odd number of CH groups
- G03C1/18—Methine and polymethine dyes with an odd number of CH groups with three CH groups
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)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
Abstract
Silver halide emulsions are sensitized by symmetrical carbocyanine dyes which contain two benzoxazole nuclei substituted by phenyl in 6 and 61 positions, united by a polymethine chain, the central carbon atom of which carries an alkyl group or by unsymmetrical carbocyanine dyes having an alkyl substituent attached to the central carbon atom of the polymethine chain and containing a benzoxazole nucleus substituted by phenyl in 6 position, the second nucleus being unsubstituted or having a substituent, especially an alkyloxy group, in 51 or 61 position. The second nucleus may be a benzthiazole, benzselenazole or 1 : 3 : 3-trimethylindoline nucleus. Suitable dyes are those formed by condensing 6-phenyl-2-methylbenzoxazole ethiodide with ethyl orthopropionate in pyridine and by condensing 6 - phenyl - 2 - methylbenzoxazole ethiodide and 6-methoxy-2-methylbenzthiazole ethiodide. 6-Phenyl-benzoxazole is prepared by nitrating para-oxydiphenyl, reducing the nitro group to an amino group and effecting ring closure by treatment with an organic acid anhydride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1151837A GB496116A (en) | 1937-04-22 | 1937-04-22 | Improvements in sensitising silver halide emulsions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1151837A GB496116A (en) | 1937-04-22 | 1937-04-22 | Improvements in sensitising silver halide emulsions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB496116A true GB496116A (en) | 1938-11-22 |
Family
ID=9987711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1151837A Expired GB496116A (en) | 1937-04-22 | 1937-04-22 | Improvements in sensitising silver halide emulsions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB496116A (en) |
-
1937
- 1937-04-22 GB GB1151837A patent/GB496116A/en not_active Expired
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