Patent · US Expired

Raw material and film prepared therefrom, having improved electrical properties

US4910639A · kind A · utility

7Cited by

7References

19Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Gunter Schloegl · Kelkheim, DE
Lothar Bothe · Mainz, DE
Guenther Crass · Taunusstein, DE
Thomas Wilhelm · Taunusstein, DE
Karl-Eduard Helf · Wiesbaden, DE

Key dates

Filing date	Feb 17, 1989
Grant date	Mar 20, 1990
Priority date	—
Expiry date	Feb 17, 2009

Classification

Technology area (CPC H)Electricity
CPC primaryH01B3/441
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.