http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6277946-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/G11B7-253 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-253 |
| filingDate | 2000-05-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2001-08-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3f28eaa8e9ed76c7ed3dfe33791ee50e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c357520feded9001413048cdf4da4c23 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3779a9410938d253e465d86e31c74a82 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_23201a15fd01a18e6d0009233c16baac http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3e992df6f1220bb7fabb3ef7ae6c832c |
| publicationDate | 2001-08-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-6277946-B1 |
| titleOfInvention | Method for preparation of polycarbonates |
| abstract | A method is provided for the preparation of polycarbonates by the reaction of a diaryl carbonate, such as DPC and a dihydric phenol, such as BPA. The method utilizes the steps of successively processing the diaryl carbonate and the dihydric phenol in a melt in a first reaction stage, a second reaction stage and at least a first polymerization stage, and shifts the processing conditions such that the desired low viscosity/high end-cap product is obtained. This is achieved by having the ratio of diaryl carbonate to dihydric phenol in the melt prior to the first reaction stage greater than 1.08; and by controlling the temperature and residence time in the first polymerization stage are selected to provide a polycarbonate product having a melt flow rate at 250° C. of greater than 10 g/10 min and an end-cap level of at least 90%. The method of the invention can be used in a linear manufacturing process, in which there is one product produced. The method of the invention can also be incorporated into a multi-line manufacturing process for the simultaneous production of more than one product. Thus, a stream of product produced from the first polymerization stage may be split into two or more lines which are further processed to produce, for example, a low viscosity, high end-cap product and a medium viscosity, moderate end-cap product. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7999056-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7279544-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7112645-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2021347939-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2005209434-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2005131197-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010273973-A1 |
| priorityDate | 2000-02-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 41.