B - Operations – Transporting – 29 – C
Patent
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.
539409
Nagou Satoshi
Nakamura Shunichi
Smart & Biggar
Tokuyama Soda Kabushiki Kaisha
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