| 摘要 |
The present invention is a microporous membrane comprising polymethylpentene (a), polyethylene (b), and polypropylene (c), the microporous membrane having a meltdown temperature of 180° C. or higher, a TD heat shrinkage at 170° C. of 35% or less, and a thickness change ratio per thickness of 10% or less. An object of the present invention is to provide a microporous membrane having a high meltdown temperature, a low shutdown temperature, and resistance to heat shrinkage at high temperatures, which cannot be obtained by the prior art.
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