Method of producing polymeric electret element
US4591465A · kind A · utility
10Cited by
9References
17Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Sep 18, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Sep 18, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2339/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In producing an electret element having piezoelectric properties by subjecting a vinylidene cyanide copolymer to a polarization treatment, the copolymer is heat-treated at a temperature below the glass transition temperature thereof prior to or simultaneously with the polarization treatment to thereby increase the longitudinal piezoelectric effect (Kt).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.