Raw material and film prepared therefrom, having improved electrical properties
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United States of America Patent
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Mar 20, 1990
Grant Date -
N/A
app pub date -
Feb 17, 1989
filing date -
Feb 19, 1988
priority date (Note) -
Expired
status (Latency Note)
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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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