| 摘要 |
PROBLEM TO BE SOLVED: To provide a separator for a nonaqueous secondary battery having shutdown characteristics, heat resistance, and strength. SOLUTION: In the separator for the nonaqueous secondary battery having a polyolefin micro-porous film and a heat-resistant porous layer formed by including a heat-resistant resin and laminated on one surface or both surfaces of the polyolefin micro-porous film, polyolefin included in the polyolefin micro-porous film includes high density polyethylene with weight-average molecular weight of 50,000-1,000,000, and the high density polyethylene is manufactured by using a chromium oxide catalyst. COPYRIGHT: (C)2011,JPO&INPIT
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