Process for producing porous films involving a stretching step and the resultant film
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United States of America Patent
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Nov 10, 1987
Grant Date -
N/A
app pub date -
Dec 14, 1984
filing date -
Dec 16, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for producing porous films which comprises blending 100 parts by weight of a polyolefin resin with 50 to 500 parts by weight of barium sulfate preferably having an average particle diameter of 0.1 to 7 .mu.m, melting the resulting resin composition and forming it into a film, and then stretching the film at least uniaxially by a factor of 1.5 to 7.
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Cited Art Landscape
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