http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1294793-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c72d118f5664072de841f9c5c34b9d99 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-307 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-30 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 |
| filingDate | 2001-04-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4e6b00d9b64db5db92eab82c603e387a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7b2d5a87986756a42a696652cc8de809 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_af725a7715213002ec061e2ea06545b7 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_efab709a1ec9831f5cf7829dcd8ec4d8 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8f0791b281e58f9631787cd226182a93 |
| publicationDate | 2003-03-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-1294793-A1 |
| titleOfInvention | Method for preparing high molecular weight polycarbonate |
| abstract | A method of preparing polycarbonate by the melt process comprising the steps of: a) melting a dihydric phenol and a diester of carbonic acid for a time and at a temperature sufficient to form a melt: and thereafter introducing a catalyst composition comprising a tetraorganophosphonium salt or a derivative thereof and 1) an alkali and/or alkali earth metal compound or derivative thereof or 2) a less active alkali and/or alkali earth metal derivative thereof into the melt; and b) oligomerizing the product from step a) to a number average molecular weight of from about 3000 to about 7500; and c) polymerizing the product from step b) to a number average molecular weight of from about 16,000 to about 35,000. |
| priorityDate | 2000-06-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 277.