http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S56118025-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_385752f237551ca1b257f160a0f2434b |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C31-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G65-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G65-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C29-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F4-52 |
| filingDate | 1980-02-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d53c399e740694afad873caf20119f8b http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_377a5d50d600aab0a79feff3791a4997 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c287fd03b36385f092c3f879722f0d0a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4991c07e7e64bdbcb4ec1269652ada32 |
| publicationDate | 1981-09-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-S56118025-A |
| titleOfInvention | Preparation of polytetramethylene glycol |
| abstract | PURPOSE: To obtain the titled compound each having a molecular weight in a wide range advantageously, by the polymerization of tetrahydrofuran in the presence of a catalyst containing boron trifluoride, etc., and an ethereal complex of hydrogen borofluoride, and then the hydrolysis of the resultant compound. n CONSTITUTION: Tetrahydrofuran is polymerized in the presence of a catalyst in the combination of (A) a compound selected from boron trifluoride and its ethereal complex, and one or more compounds selected from (B) an ethereal complex of hydrogen borofluoride and, if necessary, (C) a carboxylic acid anhydride. The resultant polymer is then hydrolyzed by a well-known method, to give the titled compound, useful as a raw material for polyether urethane elastomers of superior cutting resistance, and each having a relatively low to a relatively high molecular weight in a high catalytic activity, simply, readily and economically. The addition of the component (C) permits further improvement in the catalytic activity and ready adjustment of molecular weight. n COPYRIGHT: (C)1981,JPO&Japio |
| priorityDate | 1980-02-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 27.