MICROPOROUS FILM AND METHOD FOR PRODUCING THE SAME

摘要

Disclosed is a microporous film composed of a thermoplastic resin composition containing 5-90 parts by mass of (b) a polyphenylene ether resin per 100 parts by mass of (a) a polypropylene resin.  The microporous film has a sea-island structure consisting of a sea part mainly composed of the polypropylene resin and island parts mainly composed of the polyphenylene ether resin.  In this microporous film, pores are formed at interfaces between the sea part and the island parts as well as in the sea part.