abstract |
A polyolefin microporous membrane and its manufacturing method, characterized in that the polyolefin microporous membrane is formed by using a polyolefin resin containing polypropylene to form a gel-like molded product, which is stretched in at least one direction and cleaned by As a result, the electrolyte solution injectability is 20 seconds or less, and the polypropylene is uniformly distributed in at least one plane perpendicular to the thickness direction. To provide a polyolefin microporous membrane excellent in oxidation resistance, mechanical properties, and permeability. |