| abstract |
When measured by DSC, the polyolefin microporous membrane having a crystallinity of 65 to 85%, a proportion of lamellar crystals to crystals of 30 to 85%, a crystal length of 5 to 50 nm, and a amorphous length of 3 to 30 nm. When measured by X-ray diffraction and X-ray diffraction, the polyolefin microporous membrane whose crystal size is 12.5 nm-13.5 nm and a crystallinity is 64 to 68%. |