| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a laminated film for a separator having a shutdown characteristic important to insure safety while keeping high electric resistance contributing to battery performance, and to provide a method for manufacturing the laminated film. Ž<P>SOLUTION: The laminated porous film for the separator is formed by laminating at least two layers of porous layers, one layer of the porous layers includes a substrate layer containing polypropylene resin as the main component, and other one layer includes a shutdown layer containing polyethylene resin as the main component, the laminated porous film has β activity, an electric resistance of 10 Ω or less at 25°C, and an electric resistance of 100 Ω or more after heated at 135°C for 5 seconds. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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