Patent ID: 8409747
Filing Date: 2013-04-02
Classification: B32B,H01M,Y02E

Abstract:
1. A nonaqueous secondary battery separator which is a composite porous membrane obtained by integrally coating both sides of a polyolefin microporous membrane having a gas permeability (JIS P8117) of between 15 seconds/100 cc·μm and 50 seconds/100 cc·μm per unit thickness and a film thickness of between 5 μm and 25 μm, with a porous layer composed of polymetaphenylene isophthalamide, characterized in that the film thickness of the composite porous membrane is between 6 μm and 35 μm, the gas permeability (JIS P8117) is between 1.01 and 2.00 times that of the polyolefin microporous membrane and the polymetaphenylene isophthalamide total coating amount of both sides is between 1.0 g/m 2 and 4.0 g/m 2 .