http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1560871-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/C08G64-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-307 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 |
| filingDate | 2003-10-24^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2006-10-11^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a1f742d0edef96f6e29c91d100b7e977 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d4953ab214d5ee972385e4f1d8b7ed65 |
| publicationDate | 2006-10-11^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-1560871-B1 |
| titleOfInvention | Method for making copolycarbonates |
| abstract | A melt polymerization method is presented which permits the efficient preparation of copolycarbonates in which one or more of the constituent dihydroxy. aromatic compounds employed is relatively volatile, having a boiling point of less than about 340° C. Relatively volatile dihydroxy aromatic compounds are illustrated by dihydroxybenzenes such as hydroquinone, methyl hydroquinone and resorcinol. Known methods for the preparation of members of this class of copolycarbonates, such as the melt reaction of bisphenol A and resorcinol diphenyl carbonate in the presence of sodium hydroxide and tetraalkylammonium salt catalyst systems, suffer losses in efficiency due to the resorcinol being entrained out of the polymerization mixture with by-product phenol. Catalyst systems including quaternary phosphonium salts are shown to have improved performance with respect to the amount of volatile dihydroxy aromatic compound actually incorporated into the product copolycarbonate. |
| priorityDate | 2002-11-01^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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