http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0051499-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_385752f237551ca1b257f160a0f2434b |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G65-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G18-4854 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G65-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-48 |
| filingDate | 1981-11-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_647bc1f831244a3f0c7b9ddedc5dd9e2 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f8f59a7b83cac617e7c36a06607f668e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e6d2d7a5e99995e6e80b2d1ef6ec912a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c287fd03b36385f092c3f879722f0d0a |
| publicationDate | 1982-05-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-0051499-A1 |
| titleOfInvention | A process for the preparation of polyether glycols |
| abstract | A polyether glycol useful as a starting material for the preparation of various polymers (e.g. polyurethanes, elastomeric polyesters and elastomeric polyamides) is prepared by:… (A) polymerizing tetrahydrofuran or a mixture of tetrahydrofuran with one or more other copolymerizable cyclic ethers in the presence of a ring-opening polymerization catalyst whose principal component is fuming sulphuric acid and/or fluorosulphuric acid;… (B) heating the reaction product with water or with an aqueous alkaline solution under strongly acidic conditions to hydrolyze the product; and… (C) washing the hydrolysis product, which is the desired polyether glycol.… The polymerization in step (A) is carried out in at least two stages:… (1) in a first stage contacting the monomer or monomers with the polymerization catalyst at a temperature of from -30 DEG C to +10 DEG C; and… (2) in a subsequent stage, when conversion of the monomer to polymer has reached at least 5%, elevating the reaction temperature to a value which is from 0 DEG C to 40 DEG C and is at least 10 DEG C higher than the temperature in the first stage, and continuing the polymerization at this elevated temperature. The two stage polymerization technique enables a highly functional polyether glycol having a relatively low molecular weight (e.g. from 500 to 5,000) to be produced easily and effectively. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-103755948-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-9522573-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8138283-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2697257-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8030439-B2 |
| priorityDate | 1980-11-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 101.