| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polyolefin microporous film in which the rate property of a battery can be improved when used for a battery as a separator while maintaining excellent piercing strength. <P>SOLUTION: The polyolefin microporous membrane includes a polyolefin resin and an inorganic particle, wherein the average primary particle diameter of the inorganic particle is at least 40 nm and less than 200 nm, and the average particle size of the inorganic particle is at least 0.05 μm and at most 2.0 μm. <P>COPYRIGHT: (C)2012,JPO&INPIT |
