Method of forming a porous polyolefin film
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United States of America Patent
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May 1, 1990
Issued Date -
N/A
app pub date -
Nov 2, 1988
filing date -
Jan 21, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A gas-permeable porous film which is prepared by stretching a film made from a mixture containing a polyolefin resin and an inorganic filler at least uniaxially and possesses a rugged pattern on its surface. One process for producing the film comprises forming the aforesaid mixture into a film, providing on the surface of the film a rugged pattern, stretching the resulting film at least uniaxially, and forming on the stretched film thus-formed a rugged pattern by means of a heated emboss roll and simultaneously allowing the stretched film to contract.
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