| 摘要 |
A separator having at least: a base material layer made of a microporous membrane of a polyolefin resin; and a functional resin layer which is made of a resin different from the polyolefin resin and has a porous interconnected structure in which many holes are mutually interconnected. A diameter of a narrowest portion of through-holes of said functional resin layer is larger than a diameter of a narrowest portion of through-holes of said base material layer.
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