| abstract |
A polyolefin microporous membrane obtained by forming a gelled molded product using a polyolefin resin containing polypropylene, drawing and washing it in at least one direction, and having an electrolyte solution liquidity of 20 seconds or less and being in at least one surface perpendicular to the thickness direction. Polypropylene microporous membrane and its manufacturing method characterized by uniform propylene distribution. Provided is a polyolefin microporous membrane having excellent oxidation resistance, mechanical properties, and permeability. |