| abstract |
An object of the present invention is to provide a laminated porous film having excellent slipper property and pin extractability when used as a battery separator, which is a porous film having both air permeability and heat resistance. The heat resistant layer containing a filler and a resin binder is laminated | stacked on the at least single side | surface of a polyolefin resin porous film, the static friction coefficient of the surface of this heat resistant layer is 0.45 or less, air permeability is 2000 second / 100 ml or less, and also length Tensile modulus at 3% elongation in the direction is 400? It is 1000 Mpa, The laminated porous film characterized by the above-mentioned. |