| abstract |
A polyolefin microporous film obtained by forming a gel-like molded product using polyolefin resin containing polypropylene, stretching it in at least one direction, and washing the polyolefin microporous film, wherein the polyolefin microporous film has an electrolyte liquidity of 20 seconds or less, Wherein the polyolefin microporous membrane has a uniform propylene distribution and a production method thereof. A polyolefin microporous membrane excellent in oxidation resistance, mechanical properties and permeability is provided. |