| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous secondary battery with a good heat-resisting property, a good shutdown function, a high thermal shrinkage ratio and a high durability for good performance and good formability. SOLUTION: The separator for nonaqueous secondary battery includes a polyolefine fine porous film, and a heat resistant porous layer that is formed of a heat resistant resin and laminated on one surface or both surfaces of the porous film, wherein the heat resistant porous layer contains an inorganic filler which has at least one maximum value of particle size distribution in each of the particle size ranges of 0.01 to 0.05μm and 0.1 to 1.0μm, and contains 40 to 95 wt.% of the inorganic filler by weight fraction. COPYRIGHT: (C)2010,JPO&INPIT
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