http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2007521354-A
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-307 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 |
| filingDate | 2003-11-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2007-08-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-2007521354-A |
| titleOfInvention | Polyhydropolyborate as polymerization catalyst |
| abstract | PROBLEM TO BE SOLVED: To provide a melt polymerization method for polycarbonate capable of achieving a high polymerization rate while minimizing the amount of fleece product produced. The present invention relates to a synthesis method in which a polycarbonate is produced by contacting one or more diaryl carbonates with one or more dihydroxy aromatic compounds under melt polymerization conditions in the presence of a transesterification catalyst. The transesterification catalyst used in the process of the present invention is a combination of polyhydropolyborate with a tetraalkylammonium or tetraalkylphosphonium compound that acts as a cocatalyst. The transesterification catalyst used in the process of the present invention provides a polycarbonate with a reduced level of Fries rearrangement product compared to conventional catalysts such as a combination of sodium hydroxide and tetramethylammonium hydroxide cocatalyst. [Selection figure] None |
| priorityDate | 2003-11-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 92.