Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1989-02-17
1990-03-20
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
428220, H01G 101, B32B 516
Patent
active
049106392
ABSTRACT:
A biaxially-oriented film, suitable for use as an electrically insulating film, is disclosed. The film is composed of a highly-pure electrical film raw material based on polyolefins, in particular propylene polymers, and contains carbonate particles as a neutralizing agent. The carbonate particles preferably have an absolute particle size of less than 10 micrometers, a mean particle diameter of less than 0.1 micrometer, a specific surface area of more than 30 m.sup.2 /g and a degree of whiteness of more than 90%. The film is used as a dielectric in a capacitor and shows improved electrical properties.
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patent: 3649892 (1972-03-01), Booe
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patent: 4692837 (1987-09-01), Crass et al.
patent: 4791144 (1988-12-01), Nagou et al.
patent: 4814221 (1989-03-01), Utsumi
T. J. Hanman, "World Index of Polyolefine Stabilizers", Kogan Page Ltd., London 1982, pp. 12, 202-219, 240-243.
Bothe Lothar
Crass Guenther
Helf Karl E.
Schloegl Gunter
Wilhelm Thomas
Griffin Donald A.
Hoechst Aktiengesellschaft
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