http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6248858-B1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c72d118f5664072de841f9c5c34b9d99 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-40 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-64 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-20 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-64 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-40 |
| filingDate | 1998-11-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2001-06-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a324041c23fc396771e8b5aa01d9de74 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_60bf8f3ae0c510d5947023efedc22616 |
| publicationDate | 2001-06-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-6248858-B1 |
| titleOfInvention | Method for conducting solid state polymerization of polycarbonates |
| abstract | Polymerization of polycarbonates is performed by first enhancing the crystallinity of a precursor polycarbonate, such as an oligomer, by contact in pellet form with an alkanol in the liquid or vapor state as non-solvent, and then conducting solid state polymerization in a stream of inert gas such as nitrogen. The solid state polymerization operation includes a stage of heating at a constant temperature in the range of about 215-225° C., optionally combined with a first heating stage at a constant temperature in the range of about 180-190° C. The method is adaptable to continuous operation and produces a polycarbonate having a number average molecular weight, as determined by gel permeation chromatography relative to polystyrene, of at least 15,000. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2008044441-A1 |
| priorityDate | 1998-11-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 80.