Multilayer separator exhibiting improved strength and stability
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United States of America Patent
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Issued Date -
Oct 11, 2007
app pub date -
Apr 7, 2006
filing date -
Apr 7, 2006
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Abstract
A multi-layer microporous battery separator which comprises: a high molecular weight polypropylene layer having a melt flow index of .ltoreq.1.2 measured at layer; a polyethylene layer; and a high molecular weight polypropylene layer having a melt flow index of .ltoreq.1.2 measured at layer. The resulting microporous battery separator which is formed by a dry stretch process produces the microporous battery separator which has a porosity of .ltoreq.37% while maintaining a gurley from 13-25 seconds and a thickness of .ltoreq.25 microns.
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