Porous polymeric films
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United States of America Patent
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May 31, 1983
Grant Date -
N/A
app pub date -
Mar 31, 1981
filing date -
Mar 31, 1981
priority date (Note) -
Expired
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Abstract
This invention relates to porous films having pores with polygonal cross sections and average pore diameters of about 3 to about 100 microns and the method for preparing these films. More particularly this invention relates to a porous film having pores with polygonal cross sections and average pore diameters of about 3 to about 100 microns formed from a resinous polymer of propylene and the process for forming the film which comprises the steps of (a) forming a film containing beta-spherulites and (b) selectively extracting the beta-spherulites.
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