http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2074160-A2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6842ac50cf3ca2352074cb3a75079618 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-307 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 |
| filingDate | 2007-05-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8ac4ab10ea99c7566f632016a9037e8d http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_dd73b2b3f0c7fbe412b4b46b7c6ac555 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_904172a72d82afa414e666d1293c7381 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_71c19805bd413a6833bed2bf0dc87cb8 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_504b9fd1c381932532b2de52c6666801 |
| publicationDate | 2009-07-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-2074160-A2 |
| titleOfInvention | Polycarbonates and method of preparing same |
| abstract | Polycarbonates incorporating terminal carbonate groups derived from ester-substituted activated carbonates, for example terminal methyl salicyl carbonate (TMSC) derived from the use of BMSC as the activated carbonate in a transesterification process, have unfavorable properties with respect to color, hydrolytic stability and thermal stability, particularly when the polycarbonate containing such end groups is molded. The number of activated carbonate end groups formed during the melt transesterification formation of polycarbonate can be reduced, however, without sacrificing the benefits of using an activated diaryl carbonate, and without requiring a separate reaction or additional additives by reacting a dihydroxy compound with an activated diaryl carbonate in the presence of an esterification catalyst to produce a polycarbonate, wherein the molar ratio of activated diaryl carbonate to dihydroxy compound is less than 1 when expressed to at least three decimal places, for example 0.996 or less. |
| priorityDate | 2006-06-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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