abstract |
(57) Abstract: A porous material which, when used as a battery separator, has excellent wettability to an electrolyte used in a battery, and can provide a battery with high cycle characteristics and safety. Providing a film. The polyolefin resin has a content of 70 to 98% by weight. A porous film comprising 2 to 30% by weight of an ethylene-ethyl acrylate copolymer resin and / or an ethylene-methyl acrylate copolymer resin. |