http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S56104930-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_129e393582e6bdf4029baf2206522f45 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-78 |
| filingDate | 1980-01-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bb0503a274428e6aab4ae5334cef53c8 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a34171145a06c5a1fa035c9e7233bf0d |
| publicationDate | 1981-08-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-S56104930-A |
| titleOfInvention | Preparation of polyester |
| abstract | PURPOSE: To prevent the vacuum circuit of a condensation polymerization system from being clogged and to prevent the glycol distilled from escaping out of the system, by the batchwise condensation polymerization of a glycol ester of a discorboxylic acid in a reaction system, reduced in pressure at a specified rate. n CONSTITUTION: In the preparation of a polyester by the batchwise condensation polymerization of a glycol ester of a discarboxylic acid, the reaction system is reduced in pressure from 760W100mmHg in 10W25min, and from 100W10mmHg in 5W15min. Said method, being applicable either to ester exchange or to direct polymerization, is more effective for the direct polymerization, in which a vacuum circuit is markedly clogged in the polymerization system. In the condensation polymerization of a glycol ester obtained by esterification or a low polymer thereof, it is preferable to use one, in which a ratio of a terephthalic acid group to a terminal hydroxy group is about 1:0.1W1:2.0. n COPYRIGHT: (C)1981,JPO&Japio |
| priorityDate | 1980-01-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 18.