LAMINATED POROUS MEMBRANE, PROCESS FOR MANUFACTURING SAME AND SEPARATOR FOR BATTERY

摘要

A laminated porous membrane comprising a polyolefin porous membrane, on one surface of which projections that are made of a polyolefin and satisfy 5 µm ‰¤ W ‰¤ 50 µm (W: projection size) and 0.5 µm ‰¤ H (H: projection height) are irregularly scattered at a density of 3/cm 2 to 200/cm 2 , and a modifying porous layer laminated on the surface of the polyolefin porous membrane having the projections, wherein the modifying porous layer comprises a binder with a tensile strength of at least 5 N/mm 2 and inorganic particles. Provided are a laminated porous membrane that has an extremely high peeling strength between the polyolefin porous membrane and the modifying porous layer and is suitable for high-speed processing, and a laminated porous membrane used as a battery separator.