http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1040055-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/C08G18-10 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-10 |
| filingDate | 1963-06-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1966-08-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1040055-A |
| titleOfInvention | Production of linear segmented polyurethane and polyurea elastomers |
| abstract | Linear segmented polyurethane and polyurea elastomers are prepared by reacting a difunctional -NCO terminated prepolymer (obtained by reaction of a polymer of M.W. 600-8000 having end groups containing active hydrogen with an organic diisocyanate) with a difunctional chain extender and a monofunctional chain terminator, the mol. percentage of chain terminator being from 6.8 x (z)-2.224 to 17 x (z)-2.224, and the mol. percentage of the chain extender being 100 + 8.5 x (z)-2.224 minus the mol. percentage of chain terminator, (z) being the intrinsic viscosity of the polymer produced and having a value between 0.6 and 1.2 and all the mol. percentages being based on the mols. of difunctional isocyanate in the reaction mixture. The chain extender may be hydrazine or a diamine. The chain terminator may be a secondary monoamine, e.g. diethylamine, butylmethylamine, diisobutylamine, di-n-butyl amine, allylethylamine, dicyclobutylamine, piperidine or ethyleneimine. In Example (1) a prepolymer prepared by reaction of 2 mols. of diphenylmethane 4,41-diisocyanate with 1 mol. of polytetramethyene-ether glycol was dissolved in N,N-dimethylacetamide and reacted with a mixture of hydrazine (in water) and diethylamine (in dimethylacetamide). The diethylamine used was 10 mol. per cent and the hydrazine 96 mol. per cent based on the -NCO terminated polyether, and the resulting polymer had an intrinsic viscosity of 1.2. |
| priorityDate | 1962-06-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 42.