http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1381258-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_59c229f254be245fe0297f3f1613fb32 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-249979 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J2375-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S428-904 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J9-28 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D06N3-0052 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D06N3-14 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D06N3-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J9-28 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B29C67-20 |
| filingDate | 1970-12-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1975-01-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1381258-A |
| titleOfInvention | Water vapour permeable materials |
| abstract | 1381258 Microporous coated sheet PORVAIR Ltd 10 Dec 1971 [11 Dec 1970] 59121/70 Heading B2E [Also in Division. C3] Microporous sheet material comprising at least two superposed integrally united microporous layers are prepared from compositions comprising a thermoplastic polyurethane and a solvent therefor by spreading a substrate layer on a support and top coat layer on the substrate layer and then coagulating the two layers simultaneously to an integral self-supporting microporous sheet by treatment with a non-solvent for the polyurethane miscible with the solvent, the composition for the substrate layer comprising at least 20% w/w of polyurethane 'based on solvent and polymer, microscopic removable filter particles, and non- solvent for the polyurethane. The amount of non-solvent and filler particles being such that the composition is thixotropic. The polyurethane initially is suitably in solution in a polar organic solvent such as N,N-dimethylformamide. The non-solvent is preferably water. Preferred fillers which may be soluble in the non-solvent, are water-soluble inorganic salts, e.g. the alkali metal, alkaline earth metal and ammonium chlorides, sulphates and nitrates, sodium chloride being preferred. The ratio by weight of filler to polymer is preferably 1.0:1 to 1.4:1. Coagulation is preferably carried out at elevated temperature using water as the coagulant. The microporous sheet materials may be used in the preparation of shoe uppers. |
| priorityDate | 1970-12-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 25.