http://rdf.ncbi.nlm.nih.gov/pubchem/patent/TW-200417558-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c72d118f5664072de841f9c5c34b9d99 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-307 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-30 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 |
| filingDate | 2003-09-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2820c4cd4a92231f604594262f7af70c http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_efab709a1ec9831f5cf7829dcd8ec4d8 |
| publicationDate | 2004-09-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | TW-200417558-A |
| titleOfInvention | Method of polycarbonate preparation |
| abstract | The present invention provides a method of preparing polycarbonate, said method comprising (A) oligomerising in the presence of a catalyst at least one dihydroxyaromatic compound at a temperature in a range between about 220-280 DEG C and a pressure in a range between 180 mbar and 20 mbar, said catalyst comprising a tetraarylphosphonium compound and optionally a co-catalyst, to provide an oligomeric polycarbonate having a number average molecular weight, Mn, in a range between about 1000 and about 6000 daltons; and (B) in a second step heating the oligomeric polycarbonate formed in step (A) at a temperature range between about 280 and about 310 DEG C and a pressure in a range between about 15 mbar and about 0.1 mbar, to provide a polycarbonate having a weight average molecular weight, in a range between about 15,000 and about 50,000 daltons, said product polycarbonate comprising less than 1000 parts per million Fries product. |
| priorityDate | 2002-10-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 130.