| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an excellent porous film capable of improving various properties of devices when used in an electricity storage device such as a battery, a laminated porous film, and a separator. <P>SOLUTION: The porous film comprises a polyolefin based resin and one or more fatty acid components selected from the group consisting of saturated fatty acids, unsaturated fatty acids, and metal salts of these fatty acids, the content of a 12-24C fatty acid component being 0.001-2 mass%. The laminated porous film is obtained by laminating a porous heat-resistant layer comprising a heat-resistant resin and/or a filler on the porous film. The separator comprises the porous film or the laminated porous film. An electricity storage device or a nonaqueous electrolyte secondary battery has the separator. <P>COPYRIGHT: (C)2009,JPO&INPIT |
