Process for producing a porous film
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United States of America Patent
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-
May 1, 1990
Issued Date -
N/A
app pub date -
Aug 8, 1988
filing date -
Dec 23, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for producing a porous film having practically sufficient mechanical strengths, good flexibility, uniform fine pores and high moisture vapor permeability, and further an extremely thin porous film, which process comprises blending 30 to 80 parts by weight of an inorganic fine powder having a specific surface area of 15 m.sup.2 /g or less and an average particle size of 0.4 to 4 .mu.m with 20 to 70 parts by weight of a polyolefin resin, followed by melt-molding the resulting blend into a film and then stretching the film to 2 to 7 times the original length at least in the uniaxial direction.
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