http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-1141079-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a526baeaf0a6e90f4a91d4dbfd619756 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-80 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-78 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-18 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-18 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-80 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-78 |
| filingDate | 1980-02-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1983-02-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_30fbaefdf4b7599e7c82616be2af4e1f |
| publicationDate | 1983-02-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-1141079-A |
| titleOfInvention | Method for production of high molecular weight polyester with low catalyst level and low carboxyl content |
| abstract | METHOD FOR PRODUCTION OF HIGH MOLECULAR WEIGHT POLYESTER WITH LOW CATALYST LEVEL AND LOW CARBOXYL CONTENT ABSTRACT OF THE DISCLOSURE A high molecular weight polyester is dis-closed, having a low carboxyl content, and utilizing a low catalyst level, produced by a two-stage process; a melt process until the intrinsic viscosity of the prepolymer reaches about between 0.15 and 0.45 dl/g, and a solid state polymerization in a fluidized bed until the intrinsic viscosity of the polycondensed polymer reaches at least 0.60 dl/g. The melt process employs addition of excess initial glycol, delayed addition of excess glycol, and delayed addition of catalyst, in any combination, to achieve a low car-boxyl content polyester prepolymer capable of use in the fluidized bed solid state polymerization. This prepolymer with a minimal carboxyl content achieves a maximum solid state polymerization rate in a fluid-ized bed. This prepolymer also permits the use of a very low catalyst level to achieve high product pur-ity and still maintains economically satisfactory polymerization rate.Stability and color clarity of the polycondensed product is obtained by this method. |
| priorityDate | 1979-04-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 71.