| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a porous film which prevents deterioration of air permeation resistance by preparing a particle-containing layer on a polyolefin porous film, and is suitable for a separator for power storage device which achieves excellent battery performance and safety at a high level. <P>SOLUTION: In the porous film, the particle-containing layer containing inorganic particles is formed on at least one side of the polyolefin porous film, in which an air permeation resistance change rate (Gd) defined as follows is 10% or less, and air permeation resistance (Ga) is 50-500 sec/100 ml: Gd=ä(Ga-Gb)/Gb}×100, wherein Gd is an air permeation resistance change rate (%), Ga is air permeation resistance of the porous film (sec/100 ml), and Gb is air permeation resistance of the polyolefin porous film (sec/100 ml). <P>COPYRIGHT: (C)2011,JPO&INPIT |
