POROUS POLYOLEFIN RESIN FILM AND SEPARATOR FOR BATTERY

摘要

As an object of the present invention, to provide a polyolefin resin porous film fulfilling high continuity, excellent dimensional stability and shutdown function which closes the pores sensitively and completely in a temperature range of 120 to 140°C without closing the pores at less than 120°C. The present invention relates to a polyolefin resin porous film having at least one layer each of a layer comprising as the main component a polypropylene resin composition (A) and a layer comprising as the main component a polyethylene resin composition (B) fulfilling the condition (i) the melting point of the polyethylene resin composition (B) is 130°C or higher, and the condition (ii) the melt flow rate (MFR) of the polyethylene resin composition (B) is 2.0 to 15 g/10 minutes.