LAMINATED MICROPOROUS FILM AND METHOD FOR MANUFACTURING THE SAME, AND SEPARATOR FOR BATTERY

摘要

There is provided a laminated microporous film having an excellent balance between air permeability and film rupture temperature obtained by laminating a first microporous layer comprising a first resin composition and a second microporous layer comprising a second resin composition having a lower melting point than the first resin composition, wherein the first microporous layer has a melt viscosityηA of 10,000 Pa·s or higher, and a ratioηA/ηB of the melt viscosityηA to a melt viscosityηB of the second microporous layer is 0.01 to 10.