POLYOLEFIN MICROPOROUS FILM

摘要

A polyolefin microporous film being a laminate of three or more layers including two surface layers and at least one interlayer, characterized in that the limiting viscosity [?] of the interlayer is 3.0 dl/g or higher, and that the limiting viscosity [?] of the surface layers is smaller than the limiting viscosity [?] of the interlayer, and that the absolute value of the difference between the pore closing temperature of the surface layers and the pore closing temperature of the interlayer is less than 10°C.