POROUS MEMBRANE COMPRISING POLY(4-METHYLPENTENE-1) RESIN AND BATTERY SEPARATOR

摘要

A porous membrane comprising a poly(4-methylpentene-1) resin and having an apparent impedance of not more than 25 OMEGA .cm<2> and a Young's modulus of not less than 40 kg/mm<2>; a laminated porous membrane comprising a laminate of at least two layers of a porous membrane layer (A) comprising a poly(4-methylpentene-1) resin and a porous membrane layer (B) comprising a polyolefin resin different from the resin constituting the layer (A) and having a melting point of 100 to 400 DEG C, wherein the laminate has an apparent impedance of not more than 25 OMEGA .cm<2> and a Young's modulus of not less than 40 kg/mm<2>; a battery separator comprising the above porous membrane; and a process for preparing the same.