Microporous polyolefin membrane, its production method, battery separator, and battery
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United States of America Patent
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Sep 27, 2011
Grant Date -
Nov 19, 2009
app pub date -
Apr 9, 2007
filing date -
Apr 7, 2006
priority date (Note) -
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Abstract
or more, or (ii) a mixture of 75% by mass or more of said polyethylene resin and 25% or less by mass of polypropylene, and (b) a membrane-forming solvent, (2) stretching a gel-like sheet obtained by cooling an extrudate, (3) washing it, (4) stretching the resultant microporous membrane to 1.1-1.8 fold in at least one direction, and (5) heat-setting it at a temperature in a range of the stretching temperature of the microporous membrane plus or minus 5 degrees centigrade.
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