Process for producing a porous film

Details Process for producing a porous film Process for producing a porous film

C - Chemistry, Metallurgy

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C08J 9/26 (2006.01) B29C 55/04 (2006.01) C08J 5/18 (2006.01) C08K 3/00 (2006.01) C08K 3/26 (2006.01) C08L 23/06 (2006.01)

Patent

CA 1305300

13 ABSTRACT OF THE DISCLOSURE A process for producing a porous film having practical 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 m2/g or less and an average particle size of 0.4 to 4 µm 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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