Raw material and film prepared therefrom, having improved electr

Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor

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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.

REFERENCES:
patent: 2995688 (1961-08-01), Rosenberg
patent: 3555377 (1971-01-01), Bullwinkel et al.
patent: 3649892 (1972-03-01), Booe
patent: 4283453 (1981-08-01), Siefried et al.
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.

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