| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery separator capable of satisfying heat resistance required for a secondary battery separator, causing no melted shrinkage even when exposed to high temperatures, yet causing no problem on productivity and quality.SOLUTION: A secondary battery separator includes: a first porous layer including unmodified polyolefin; a second porous layer provided on the first porous layer and including polyolefin containing a polar group; and a heat resistant layer provided on the second porous layer and including particles. |
