GB630659A - Improvements in or relating to the manufacture of photographic developing agents - Google Patents
Improvements in or relating to the manufacture of photographic developing agentsInfo
- Publication number
- GB630659A GB630659A GB2643247A GB2643247A GB630659A GB 630659 A GB630659 A GB 630659A GB 2643247 A GB2643247 A GB 2643247A GB 2643247 A GB2643247 A GB 2643247A GB 630659 A GB630659 A GB 630659A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sulphur dioxide
- water
- amino
- ethyl acetate
- diethylaniline
- 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
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A sulphur dioxide compound of p-aminodiethylaniline, as described in Specification 626,958, [Group XX], for use in colour photographic development is made by reacting p-amino-diethylamiline with sulphur dioxide in presence of approximately one molecular proportion of water. Conveniently the reaction is effected in an organic solvent medium such as diethyl ether or ethyl acetate, in which the water can be dissolved. Example 1 describes the passing of sulphur dioxide gas into ethyl acetate with external cooling to form a solution thereof, addition of this solution to one of p-amino-diethylaniline in ethyl acetate containing the required quantity of water, and filtration and washing of the precipitated product. In example 2 sulphur dioxide gas is bubbled through p-amino-diethylaniline cotaining water, with ice cooling, to produce a thick paste, which is extracted with diethyl ether to remove any remaining free base and then washed and dried. The Provisional Specification states that the process may be applied to the production of sulphur dioxide compounds of other aromatic amines, in particular those described in Specification 629,558, [Group XX].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2643247A GB630659A (en) | 1947-09-30 | 1947-09-30 | Improvements in or relating to the manufacture of photographic developing agents |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2643247A GB630659A (en) | 1947-09-30 | 1947-09-30 | Improvements in or relating to the manufacture of photographic developing agents |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB630659A true GB630659A (en) | 1949-10-18 |
Family
ID=10243524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2643247A Expired GB630659A (en) | 1947-09-30 | 1947-09-30 | Improvements in or relating to the manufacture of photographic developing agents |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB630659A (en) |
-
1947
- 1947-09-30 GB GB2643247A patent/GB630659A/en not_active Expired
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