Nixon & Vanderhye
High-strength porous film and process for producing the same
 The present invention relates to a high-strength porous film or sheet consisting essentially of a high-molecular-weight polyethylene resin having a viscosity-average molecular weight of not less than 300,000, wherein the said film has a thickness of 5 to 50 .mu.m, an air permeability of 200 to 1,000 sec/100 cc, a porosity of 10 to 50% and a pin puncture strength of not less than 600 gf/25 .mu.m, and a process for producing the said film. 
Mitsubishi Chemical Corporation
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Y02E B01D H01M C08J Y10T B29C B29C H01M Y10T C08J C08J C08J C08J Y10T H01M B29C C08J C08J H01M
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Toshio Tatsuya
Fujii Mochizuki