http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-965024-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b30f06d64e376387ac626c9116b7683d |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-30 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-06 |
| filingDate | 1962-07-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1964-07-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-965024-A |
| titleOfInvention | Polycarbonates |
| abstract | The Specification refers to predominantly tetrameric cyclic carbonates of dihydroxy-diaryl-alkanes, -cycloalkanes, -ethers, -sulphides, -sulphoxides and -sulphones. The cyclic tetrameric carbonate of bisphenol-A is made by reacting bisphenol-A with the bischloroformate of bisphenol-A in the presence of methylene chloride and pyridine. Other tetramers may be made in a similar manner.ALSO:A high molecular weight linear polycarbonate is made by heating at above 200 DEG C. and in the presence of water and/or an organic hydroxy compound, a predominantly tetrameric cyclic carbonate of a dihydroxydiaryl-alkane, -cycloalkane, -ether, -sulphide, -sulphoxide or -sulphone. The hydroxy compound may be phenol, a cresol, a xylenol, an ethylphenol, p-tertiarybutylphenol, butanol, hexanol or stearyl alcohol. Polymerization may also be effected in the presence of (a) a chain-breaker which is an organic hydroxy compound or ester (e.g. carbonate) thereof; (b) a branching agent which is a trifunctional organic hydroxy compound (e.g. phloroglucinol) or ester thereof; (c) a catalyst (e.g. lead oxide, zinc oxide, antimony trioxide, sodium methylate, a sodium salt of an aromatic dihydroxy compound, sodium stearate, magnesium stearate, zinc acetate, beryllium acetate or boron phosphate); or (d) a dyestuff, filler, pigment, plasticizer or stabilizer. The polymers are useful in the manufacture of coatings, fibres, films and other shaped objects. |
| priorityDate | 1961-08-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 57.