http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1069340-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08L75-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L75-00 |
| filingDate | 1966-01-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_588a7b6262a1c35e4dc85c9767f9b51a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_304b8fcd1148ec0f0e53dfceda55007b |
| publicationDate | 1967-05-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1069340-A |
| titleOfInvention | Improvements in and relating to the preparation of polyurethanes |
| abstract | A polyurethane is prepared by reacting together, in stoichiometric amounts, a piperazine component viz. piperazine, 2-methyl piperazine, 2,5-dimethyl piperazine and/or 2,3,5,6-tetramethyl piperazine, with the bis-chloroformates of both a polyalkylene ether glycol and an aliphatic diol of M.W. below 200 in molar proportions from substantially 2:1 to 1:3, respectively, wherein either the polyalkylene ether glycol bischloroformate component or the diol bischloroformate component is first reacted with up to 1 molar excess of the piperazine component, and then the resulting product is reacted in a second step with the other bischloroformate component and any remaining piperazine component. The diol may be 1,4-butane diol, neopentyl glycol or 1,4-dimethylol cyclohexane. The process may be effected in the presence of a solvent and the second step may be effected in the presence of an excess of an acid acceptor, e.g. Na2CO3. |
| priorityDate | 1965-01-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 32.