Film capacitor
US4843517A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1988 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Dec 6, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G4/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The dielectric polymeric film in the inventive film capacitor is formed from a cyanoalkyl-containing organopolysiloxane represented by the average unit formula EQU R.sup.1.sub.a R.sup.2.sub.b SiO.sub.(4-a-b)/2, in which R.sup.1 is a cyanoalkyl group having 3 to 5 carbon atoms, R.sup.2 is a hydrogen atom, monovalent hydrocarbon group or halogenated monovalent hydrocarbon group, the subscript a is a positive number in the range from 0.8 to 1.8 and the subscript b is zero or a positive number not exceeding 1.0 with the proviso that a+b is in the range from 1.1 to 1.98. As compared with films of conventional cyanoethylated polymers and fluorocarbon resins used for the same purpose, such an organopolysiloxane film is very advantageous as a dielectric film of film capacitors in respect of the large dielectric constant, small dielectric loss, small moisture absorption and excellent thermal stability so that the film capacitor of the invention exhibits greatly upgraded performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.