Microporous film and process for production thereof

Details Microporous film and process for production thereof Microporous film and process for production thereof

B - Operations, Transporting

29

C

18/33

B29C 67/20 (2006.01) B29C 55/02 (2006.01) C08F 10/00 (2006.01) C08J 5/18 (2006.01) C08J 9/26 (2006.01)

Patent

CA 1311886

Abstract of the Disclosure Disclosed is a microporous polypropylene film comprising a propylene homopolymer, a copolymer of propylene with other copolymerizable monomer or a blend thereof, which has an intrinsic viscosity (n) of 1.9 to 3.0 d?/g, especially 2.0 to 3.0 d?/g, as measured at 135°C in tetralin, said microporous film having a network structure comprising intercommunicating pores having a maximum pore size smaller than 1 µ and an average pore size of 0.005 to 0.6 µ and having a porosity of 30 to 90%, an air permeability of 5 to 500 sec/100 cc and a thickness of 5 to 200 µ, said microporous film being molecularly oriented by stretching.

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