http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-471847-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6108c9a7f7a472c2db8923daca0ec8d6 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B03B9-005 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B04C9-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08B3-22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08B15-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08B3-22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08B15-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B04C9-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B03B9-00 |
| filingDate | 1937-02-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1937-09-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-471847-A |
| titleOfInvention | Improvements in or relating to the manufacture and treatment of cellulose derivatives |
| abstract | The process described in the parent Specification is modified by treating the dissolved cellulose ether or secondary cellulose ester with an agent containing or readily liberating an amount of free chlorine not exceeding 1 per cent of the weight of the cellulose derivative. Another modification of the process of the parent Specification consists in treating the cellulose derivative while still in solution in the medium in which it has been produced, after that solution has been thinned by adding a diluent or solvent. In an example, cellulose acetate solution obtained by reacting cellulose with acetic anhydride in presence of sulphuric acid and acetic acid is subjected to a ripening treatment and the solution is then thinned by adding aqueous acetic acid. A concentrated aqueous solution of sodium bicarbonate is beaten into the solution to neutralize the catalyst. Chlorine water in amount equal to 0,1 per cent chlorine based on the weight of cellulose acetate is added. After several minutes, warm water is stirred into the solution until it is at the point of precipitation. A large mass of water is then added and the cellulose acetate separates as fluffy fibres. The product is washed and stabilized. Hypochlorites may be used instead of chlorine. The cellulose acetate preferably while in solution may be treated with an anti-chlor such as a solution of borax. It may be subjected to further bleaching with hypochlorite or peroxide after precipitation. The products may be used for making films, filaments, moulding powders, plastics, lacquers, blocks, tubes, and rods. Ethyl, methyl, or benzyl cellulose, or secondary cellulose formate, acetate, propionate, or butyrate may be treated. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2562883-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2562884-A |
| priorityDate | 1936-02-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 45.