http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1427771-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/C08G64-307 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-06 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-06 |
| filingDate | 2002-06-17^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2007-08-01^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_af725a7715213002ec061e2ea06545b7 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_60bf8f3ae0c510d5947023efedc22616 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_48f0f57eaf17beb6a4fc4e5b3ac3844d http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_efab709a1ec9831f5cf7829dcd8ec4d8 |
| publicationDate | 2007-08-01^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-1427771-B1 |
| titleOfInvention | Method of polycarbonate preparation by solid state polymerization |
| abstract | Solid state polymerization of partially crystalline polycarbonate oligomers bearing ester-substituted terminal groups occurs at useful reaction rates despite their high level of endcapping. Partially crystalline polycarbonate oligomers having ester substituted terminal groups may be obtained in a single step by reaction of an ester substituted diaryl carbonate such as bis-methyl salicyl carbonate with a dihydroxy aromatic compound such as bisphenol A in the presence of a transesterification catalyst such as sodium hydroxide. Alternatively, amorphous oligomeric polycarbonates incorporating ester substituted endgroups may be obtained through careful control of the melt reaction conditions. The amorphous oligomeric polycarbonates are crystallized upon exposure to solvent vapor and subsequently undergo solid state polymerization at synthetically useful reaction rates. |
| priorityDate | 2001-07-24^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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