Biaxially oriented polypropylene film and a capacitor made there

Details Biaxially oriented polypropylene film and a capacitor made there Biaxially oriented polypropylene film and a capacitor made there

1996-08-27

1998-03-03

Picard, Leo P.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

361314, 361315, 361318, 252567, 2642902, H01G 426

Patent

active

057242224

ABSTRACT:
The present invention relates to a biaxially oriented polypropylene film and a capacitor made thereof. The biaxially oriented polypropylene film of the invention is a biaxially oriented polypropylene film that is 98-99.5% in isotacticity, above 99% in isotactic pentad fraction, and 1-4% in the sum of the machine- and transverse-direction heat shrinkage at 120.degree. C., or a biaxially oriented polypropylene film that is less than 10 ppm.multidot.% in the product of the film's ash content and internal haze and is above 99% in isotactic pentad fraction. With this constitution, the biaxially oriented polypropylene film of the present invention has good dielectric properties at high temperatures. Furthermore, the capacitor of the invention can be used safely for a long life at operating temperatures higher by up to 20.degree. C. than the maximum operating temperature of 85.degree. C. of the conventional biaxially oriented polypropylene films.

REFERENCES:
patent: 3620825 (1971-11-01), Lohmann
patent: 3715639 (1973-02-01), Gaines et al.
patent: 4405775 (1983-09-01), Hashimoto
patent: 4631632 (1986-12-01), Kano et al.
patent: 4769418 (1988-09-01), Mizuno et al.
patent: 5277970 (1994-01-01), Schuhmann et al.
patent: 5292563 (1994-03-01), Peiffer et al.

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