http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-03076494-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c898d7f93b9bdb87a263a376a7ec860 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_51860910f2c3a715e58b3c6ae81c4b52 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_652e1d833c299c62409f52b34e9e0739 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ec5e49dc346ce8171ee61365e42c47b2 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G65-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G65-30 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G65-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G65-30 |
| filingDate | 2003-03-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_58a51147f342e126c1c6473c60bc0348 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_00ffddd0112b0726517fe0dc2291f253 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d6bca5a20eab569950a8d54d98b625bb http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c4d706aaf1583a1217cc11ef72665b79 |
| publicationDate | 2003-09-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | WO-03076494-A1 |
| titleOfInvention | Method for the production of polytetrahydrofuran with a reduced cyclical oligomeric ether content |
| abstract | The invention relates to a method for producing polytetrahydrofuran (PTHF) or tetrahydrofuran (THF) copolymers having an average molecular weight of 650 to 6000 and a cyclical oligomeric ether content of less than 1 percent by weight by means of a treatment with a solvent. The inventive method is characterized by the following steps: a) PTHF or THF copolymers is/are extracted in one or several steps with an aliphatic, linear or branched, cycloaliphatic or olefinic hydrocarbon containing 1 to 15 hydrocarbon atoms, mixtures of said hydrocarbons, or mixtures containing at least 50 percent by weight of said hydrocarbons at temperatures ranging from 20 to 120° C; b) the PTHF phase or THF copolymer phase is separated from the hydrocarbon phase; c) the PTHF phase or THF copolymer phase is largely liberated of hydrocarbon; d) the hydrocarbons are separated from the hydrocarbon phase obtained in step b) by means of distillation; and e) the mixture of cyclical oligomeric ethers and linear PTHF oligomers or oligomeric THF copolymers resulting from step d) is cat-cracked back to THF, and THF is optionally returned to polymerization. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7427626-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8609805-B2 |
| priorityDate | 2002-03-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 36.