LAMINATED POROUS FILM, METHOD FOR MANUFACTURING SAME AND SEPARATOR FOR SECONDARY BATTERY COMPRISING SAME

摘要

A laminated porous film having a structure in which at least two layers are laminated comprises a first resin layer including polypropylene resin and a beta-nucleating agent and a second resin layer including polyethylene resin and a wax having the melting point of at least 90º and crystallinity of at least 80%, and has excellent shutdown, breakdown, and air permeability. Thus, the present invention can be effectively used in a separator for a secondary battery and the like.