http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-939447-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9799ffcda2dbb45041a5ab0fd08dd5fe |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-795 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-795 |
| filingDate | 1960-07-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1963-10-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-939447-A |
| titleOfInvention | Improvements in polycarbonates |
| abstract | A block copolycarbonate consists essentially of blocks comprising recurring units of formula <FORM:0939447/IV(a)/1> and blocks consisting of recurring units of formula <FORM:0939447/IV(a)/2> Preferably, the number of units in any block is 3-50 and the units of the former formula are present in about 30-70 mole per cent of the block copolymer. The copolycarbonates may be made by first making two homopolymers by reacting phosgene with 2,2-bis-(4-hydroxyphenyl) propane or bis-(4-hydroxyphenyl) diphenylmethane in the presence of methylene chloride and aqueous caustic soda, then reacting the two homopolymers in the presence of tri-n-butylamine, next acidifying the reaction mixture with acetic acid to stop the copolymerization, and finally washing the resulting viscous dope and precipitating the copolymer from solution by pouring into methanol. The copolymers may be made into films, e.g. by casting from methylene chloride solution, which are useful in the manufacture of photographic film bases, packing materials, adhesive tape bases, kinescope recording tapes and condenser dielectrics. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0089801-A1 |
| priorityDate | 1959-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 29.