Patent ID: 9337461
Filing Date: 2016-05-10
CPC Classification: B32B,H01G,H01M,Y02E

Claim Text:
1. A battery separator composite porous membrane comprising a porous membrane B comprising a heat-resistant resin that is free of water-soluble polymers and laminated on a surface of a polypropylene resin of an outermost layer of a porous membrane A comprising at least one layer, wherein the heat-resistant resin being free from water-soluble polymers, wherein at least one of the outermost layers comprises the polypropylene resin, the composite porous membrane satisfying Equations (A) to (D): wherein X is an air resistance (sec/100 cc Air) of the porous membrane A, and Y is an air resistance (sec/100 cc Air) of the composite porous membrane.