| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a porous film which exerts excellent battery life or reliability when used as a separator for an electricity storage device. <P>SOLUTION: In the porous film, the value of D<SB POS="POST">max</SB>/D<SB POS="POST">ave</SB>is 1.05 or less, wherein D<SB POS="POST">max</SB>is a maximum pore diameter based on bubble point method and D<SB POS="POST">ave</SB>is an average pore diameter based on a half dry method. <P>COPYRIGHT: (C)2013,JPO&INPIT |
