http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-570027-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7d2f250824b2f8a7e51ed7100af74f8e http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f309a082ed0ace5f181db5c16e73e949 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C5-18 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C5-18 |
| filingDate | 1944-01-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1945-06-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-570027-A |
| titleOfInvention | Improved process for the development and production of diazo-type prints |
| abstract | 570,027. Diazotype processes. HALL, HARDING, Ltd., and LEUCH, W. P. Jan. 3, 1944, No. 61. [Class 98 (ii)] Papers sensitized with diazo compounds are developed by the application of a very thin layer of developer which is incapable of fully developing the print when used in the ordinary manner at room temperature and then immediately heating the print to promote the development and dry the print. The developer may be applied by rollers and the heating effected by contact with a hot roller or by blowing hot air or steam on to the print surface. In acid development as in Specification 425,235, much smaller amounts of coupling accelerators may be used, and the range of substances is increased, e.g. salts of weak bases with weak acids such as zinc acetate or magnesium lactate may be used. Acidic developers not containing coupling accelerators may be used if the lightsensitive layer contains as acidifying substance an aluminium salt and if the developer contains about ยข to 1 per cent of sodium fluoride in addition to the coupling component and wetting agents. Light-sensitive layers containing diazo compounds normally only capable of coupling under alkaline conditions can be developed with neutral or acid developers containing coupling accelerators. The developers may be made up with a mixture of secondary and primary alkali phosphate, giving an approximately neutral reaction. The developers may also be faintly alkaline. The layer of developer applied to the print may be much thinner providing that the concentration of azo-coupling component is such that the amount deposited on the print remains the same. Coupling components with very much lower coupling energy than phloroglucinol or resorcinol may be used. A paper sensitized with a composition comprising water, the zinc chloride double salt of 4-phenylacetylamino- 2:5- diethoxybenzene - 1 - diazonium chloride and aluminium sulphate may be developed with (a) water, phloroglucinol, tartaric acid, sodium benzoate, sodium formate and sodium chloride, or (b) water, phloroglucinol, tartaric acid, zinc acetate and sodium chloride, or (c) water phloroglucinol, tartaric acid, sodium fluoride and sodium chloride. Part of the phloroglucinol may be replaced with resorcinol. With diazo compounds containing in the nucleus containing the diazo group also a basic group instead of an acylamino group the developers should contain more coupling accelerator. A paper sensitized with a composition comprising water, diphenylamino-4- diazonium sulphate, tartaric acid and thiocarbamide may be developed with water, phloroglucinol, tartaric acid, sodium acetate and sodium benzoate. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3144334-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2653091-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2789904-A |
| priorityDate | 1944-01-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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Total number of triples: 47.