JPS5796331A - Production of silver halide emulsion for direct positive - Google Patents
Production of silver halide emulsion for direct positiveInfo
- Publication number
- JPS5796331A JPS5796331A JP17282680A JP17282680A JPS5796331A JP S5796331 A JPS5796331 A JP S5796331A JP 17282680 A JP17282680 A JP 17282680A JP 17282680 A JP17282680 A JP 17282680A JP S5796331 A JPS5796331 A JP S5796331A
- Authority
- JP
- Japan
- Prior art keywords
- silver halide
- halide emulsion
- emulsion
- water soluble
- direct positive
- 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.)
- Pending
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
- G03C1/485—Direct positive emulsions
- G03C1/48515—Direct positive emulsions prefogged
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Abstract
PURPOSE:To improve age stability by adding specific mercaptotriazoles to a silver halide emulsion after the end of physical maturation in producing a titled emulsion of high sensitivity by adding an electron acceptor, water soluble bromide, etc. to said emulsion. CONSTITUTION:After a fogging process of a silver halide emulsion for direct positive contg. >=50mol% silver chloride, an electron acceptor (e.g.; indole cyanine dye) or a halogen acceptor and the 1, 2, 4-triazoline-3-thion expressed by the formulaI(R1 is H, COR3, SO2R4; R2 is H, an aliphatic group, an aromatic group; R3, R4 are aliphatic groups, aromatic groups) or its deriv. are added thereto. Further, in order to increase sensitivity, required amts. of water soluble bromide and water soluble iodide are added, whereby a titled silver halide emulsion is obtained. The compound of the formulaIis embodied by compounds of the formulaI, formula III, etc.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17282680A JPS5796331A (en) | 1980-12-08 | 1980-12-08 | Production of silver halide emulsion for direct positive |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17282680A JPS5796331A (en) | 1980-12-08 | 1980-12-08 | Production of silver halide emulsion for direct positive |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5796331A true JPS5796331A (en) | 1982-06-15 |
Family
ID=15949073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17282680A Pending JPS5796331A (en) | 1980-12-08 | 1980-12-08 | Production of silver halide emulsion for direct positive |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5796331A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6375738A (en) * | 1986-09-19 | 1988-04-06 | Fuji Photo Film Co Ltd | Direct positive type silver halide photographic sensitive material |
JPH02146035A (en) * | 1988-11-28 | 1990-06-05 | Fuji Photo Film Co Ltd | Black and white silver halide photographic sensitive material |
-
1980
- 1980-12-08 JP JP17282680A patent/JPS5796331A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6375738A (en) * | 1986-09-19 | 1988-04-06 | Fuji Photo Film Co Ltd | Direct positive type silver halide photographic sensitive material |
JPH02146035A (en) * | 1988-11-28 | 1990-06-05 | Fuji Photo Film Co Ltd | Black and white silver halide photographic sensitive material |
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