| abstract |
A porous substrate having an average pore diameter of 20 nm or more and 100 nm or less and a porous layer provided on one surface or both surfaces of the porous substrate and containing a polyvinylidene fluoride resin and a filler, Wherein the polyvinylidene fluoride resin contained in the porous layer has a weight average molecular weight of not less than 1,000,000 and a peeling strength between the porous substrate and the porous layer is not less than 45% 0.20 N / 12 mm or more, separator for non-aqueous secondary battery. |