http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-932384-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G75-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G75-02 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G75-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G75-10 |
| filingDate | 1960-06-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1963-07-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-932384-A |
| titleOfInvention | Crystalline poly (methylene sulfide) and process for its preparation |
| abstract | A thermoplastic, crystalline, fibre-forming poly(methylene sulphide) having a melting point of at least 220 DEG C. is prepared by condensing methane dithiol or mercaptomethyl sulphide (HSCH2SCH2SH) in the presence of a basic catalyst at a temperature of 25 DEG to 250 DEG C. while removing the hydrogen sulphide which is liberated. The product may be further treated with a mineral acid, e.g. hydrochloric acid, at a temperature of 90 DEG -100 DEG C., washed, dried and reheated above 100 DEG C. in the presence of an alkaline catalyst until no more H2S is evolved, to produce a polymer of higher melting point. Suitable catalysts are ammonia, di- and tri-ethylamine, methylamine, n-hexylamine, tri-n-hexylamine, pyridine, piperidine, pentamethylene diethylene triamine, tributylamine, hydrazine, dimethyl formamide, dimethyl acetamide, triphenyl-phosphine, -arsine and -stilbene, and sodium hydroxide, carbonate, bicarbonate and sulphite. The reaction may be effected in a medium such as tetramethylene sulphone, dimethyl acetamide, nitromethane, dimethyl formamide or mineral oil. The products are compared with a poly(methylene sulphide) prepared from H2S and hexamethylene tetramine. Uses: Fibres, films, tubes, rods &c. |
| priorityDate | 1959-07-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 66.