微多孔膜、これらの膜の作製方法、およびバッテリーセパレータフィルムとしてのこれらの膜の使用

摘要

Embodiments of the invention relate to microporous membranes that include first and second layers. The first layer includes ≦̸20.0 wt. % polymethylpentene and the second layer includes a compatibilizer. The invention also relates to methods for making such membranes and the use of such membranes as battery separator film.