Patent · US Expired

High-performance dielectric film with improved thermal stability

US5085916A · kind A · utility

4Cited by

2References

20Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Thomas Wilhelm · Taunusstein, DE
Gunter Schloegl · Kelkheim, DE
Lothar Bothe · Mainz, DE
Guenther Crass · Taunusstein, DE

Key dates

Filing date	Sep 15, 1989
Grant date	Feb 4, 1992
Priority date	—
Expiry date	Sep 15, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31938
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The extruded, biaxially oriented dielectric film is composed of high-purity electrical film raw material. It is suitable as electrical insulating film in particular as a dielectric in an electrical capacitor, and exhibits improved dielectric properties for this prupose. The film comprises propylene polymers and stabilizers for the propylene polymers. The raw material of the film has an idealized thermo-oxidation temperature in the range from 260.degree. to 300.degree. C., preferably 260.degree. to 280.degree. C. The dielectric film has an idealized thermo-oxidation temperature of 250.degree. to 300.degree. C., in particular 250.degree. to 280.degree. C. The content of organic neutralizing agents, in particular calcium stearate, in the raw material is less than/equal to 100 ppm.

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