Microporous polyolefin multi layer film and preparing method thereof
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United States of America Patent
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Aug 23, 2011
Grant Date -
Jul 2, 2009
app pub date -
Dec 23, 2008
filing date -
Dec 26, 2007
priority date (Note) -
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Abstract
The present invention relates to a multi-layered microporous polyolefin film for a battery separator and a method for preparing the same. The microporous multi-layered film of the present invention has a characteristics to have both the low shutdown temperature conferred by the polyethylene and the high melt fracture temperature conferred by the polypropylene and heat-resistant filler. In addition, it has the high strength and stability conferred by the micropores prepared under wet process and the high permeability and high strength conferred by the macropores prepared under dry process. Therefore, this multi-layered film can be used effectively to manufacture a secondary battery with high capacity and high power.
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