Microporous Multilayer Membrane, System And Process For Producing Such Membrane, And The Use Of Such Membrane

摘要

The invention relates to a multilayer microporous membrane comprising polyethylene and polypropylene and having an improved balance of properties including improved thickness variation in at least one planar direction. The invention also relates to a system and method for producing such a membrane, the use of such a membrane as a battery separator film, and batteries containing such a membrane.