MULTILAYER POROUS FILM AND SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Provided is a laminated porous film formed by laminating a heat-resistant resin layer on a porous film made from a polyolefin-based resin containing an ethylene-±-olefin copolymer including a structural unit derived from ethylene and a structural unit derived from one or more kinds of monomers selected from ±-olefins having 4 to 10 carbon atoms, wherein a shutdown temperature is 125°C or lower and a thermal film breakage temperature is 155°C or higher.