http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1061758-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_94aafba413093babffa661ec0ca0c362 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-785 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-58 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-58 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-78 |
| filingDate | 1963-10-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1967-03-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1061758-A |
| titleOfInvention | Production of polyesters |
| abstract | Polyesters are made by reacting one or more dicarboxylic anhydrides with one or more of ethylene oxide, 1:2-propylene oxide or 1:2-butylene oxide in the substantial absence of water and in the presence of (a) in initiator which is a mono- or poly-carboxylic acid or a polyhydric alcohol and (b) a catalyst which is an oxide, acetate, butyrate, stearate, oleate, naphthenate, chloride, phosphate or nitrate of zinc, tin, manganese, lead, nickel, cobalt or cadmium. Specified dicarboxylic anhydrides are maleic, itaconic, succinic, glutaric, phthalic, dihydrophthalic, tetrahydrophthalic, tetrachlorophthalic and endomethylenetetrahydrophthalic anhydrides. Specified initiators are (i) isophthalic and terephthalic acids and acids formed by hydration of the above anhydrides and (ii) glycerol, trimethylol ethane, pentaerythritol and glycols formed by hydration of the above epoxides. The reaction may be effected continuously in a vertical, horizontal or inclined tube provided with a shaft having arms carrying spiralled scraper blades which keep the walls of the tube free of resin and impel the reactants through the tube. At the end of the reaction, the polyester may be heated to about 200 DEG C., and this will isomerize any maleic units to fumaric units. Those resins derived from ethylenically unsaturated dicarboxylic anhydrides may be copolymerized with unsaturated monomers. In Example 1, a polyester was made by reacting maleic anhydride, phthalic anhydride, propylene oxide and ethylene glycol and may be copolymerized with styrene or vinyl toluene. In Example 2, a similar polyester was mixed with styrene, and possibly an inhibitor (e.g. hydroquinone and/or trimethylbenzyl ammonium chloride) and the mixture cured after the addition of benzoyl peroxide. Reference has been directed by the Comptroller to Specifications 998,248 and 1,000,534. |
| priorityDate | 1962-10-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 70.