Oriented porous films

Details Oriented porous films Oriented porous films

C - Chemistry, Metallurgy

08

J

18/23

C08J 9/26 (2006.01) A01G 13/02 (2006.01) B29C 55/00 (2006.01) C08F 110/06 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2028147

2028147 9011321 PCTABS00002 This invention relates to oriented porous films having cells with polygonal cross sections and average pore diameters of about 5 to about 30 microns and inter-connecting pores between the cells which have a diameter of about 0.2 to about 20 microns which are formed from a polypropylene-based resin and a process for forming the film which comprises the steps of forming a film containing beta-spherulites, selectively extracting a portion of the beta-spherulites to form a porous film and stretching the porous film in at least one direction to form the oriented polymeric porous film.

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