| abstract |
Provided are a polyolefin microporous membrane produced by forming a gel-like molding using a polyolefin resin containing polypropylene, and stretching the molding in at least one direction, followed by washing, the polyolefin microporous membrane having an injection of electrolyte of 20 seconds or less and a uniform polypropylene distribution in at least one plane perpendicular to the thickness direction, and a method of producing the same. n Also provided is a polyolefin microporous membrane excellent in oxidation resistance, mechanical properties, and permeability. |