Multi-layer, microporous polyolefin membrane, its production method, battery separator and battery
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United States of America Patent
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Apr 29, 2014
Grant Date -
Nov 25, 2010
app pub date -
Aug 29, 2008
filing date -
Aug 31, 2007
priority date (Note) -
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Abstract
The invention relates to polyolefin membranes and membrane precursors comprising polyethylene and polypropylene. The polyolefin membrane can be a microporous polyolefin membrane comprising a first microporous layer and at least one second microporous layers where the first and second layers contain polypropylene and polyethylene, and the amount of polyethylene in the first layer is at least about 80 wt. % and the amount of polyethylene in the second layer is at least about 50 wt. %. The amount of polyethylene is higher in the first microporous layer than in the second microporous layer, and the total amount of the polyethylene in the first and second microporous layers is at least about 61 wt. %, based on the weight of the multi-layer, microporous polyolefin membrane.
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