MICROPOROUS MEMBRANE AND PRODUCTION METHOD THEREFOR
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United States of America Patent
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Jan 7, 2016
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Jan 9, 2015
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Provided is a microporous membrane made of a polypropylene-based resin and having high porosity, being useful as a battery separator. The microporous membrane is composed of a polypropylene-based polymer in which a melt mass flow rate (MFR) measured at 230° C. and a load of 21.18 N in accordance with JIS K6758 is 1.0 g/10 min or less, and has porosity of 50% or more. Provided is also a method for producing the same.
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