http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-791296-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H01B3-42 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H01B3-42 |
| filingDate | 1955-08-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1958-02-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-791296-A |
| titleOfInvention | Electrical insulating foils and method of producing same |
| abstract | The invention comprises foil for electrical insulation consisting of a self-supporting thin layer of the reaction product of an organic polyisocyanate and a branched organic polyhydroxy compound only. It also comprises the manufacture of such foils by applying the components necessary for the formation of the reaction product to a metallic tape and reacting the components thereon, whereupon the polyurethane films formed on the tape are detached by wholly or partially dissolving away those parts of the support in contact with the films. Aluminium foil or copper are suitable as the supporting metals, and hydrofluoric acid is preferred for removing the support. Preferred polyhydroxy compounds are branched polyesters. In examples an aluminium foil is passed through a dipping solution and then through a vertical drying channel where it is heated at 150 DEG to 300 DEG C. to effect polycondensation. The tape is then passed through a 1 per cent solution of hydrofluoric acid and the polyurethane foils are stripped off. The dipping solutions are prepared by mixing (1) a solution of a polyester from adipic and phthalic acids and hexanetriol in methylene chloride, ethylene chloride and ethyl acetate with a solution of an adduct from toluylene diisocyanate in methylene chloride, toluene, ethyl acetate and chlorobenzene; (2) a solution of an adipic acid/trimethylol propane polyester in ethyl acetate, benzene and monomethyl glycol ether acetate and a solution of toluylene diisocyanate and hexanetriol in ethyl acetate, toluene, xylene and monomethyl glycol ether acetate; (3) a polyester from phthalic and adipic acids, 1,3-butylene glycol and trimethylol propane dissolved in ethyl acetate and monomethyl glycol ether acetate, and toluene diisocyanate and hexanetriol in the same solvents; (4) a similar polyester solution to (3) and a solution of the reaction product of trimethylolpropane and toluylene diisocyanate containing phenol dissolved in ethyl acetate, toluene and cyclohexanone. |
| priorityDate | 1955-08-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 54.