POLYOLEFIN MICROPOROUS FILM AND ROLL
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United States of America Patent
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Issued Date -
Feb 3, 2011
app pub date -
Mar 26, 2009
filing date -
Mar 31, 2008
priority date (Note) -
Abandoned
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Abstract
An object of the present invention is to provide a polyolefin microporous film that can sufficiently reduce the occurrence of raised edges at a slitting step such as a slitting step at the time of producing the polyolefin microporous film and a slitting step at the time of processing the polyolefin microporous film into a roll. The present invention provides a polyolefin microporous film formed from a polyolefin composition comprising a polyethylene, a first polypropylene having a viscosity average molecular weight of not less than 50,000 and less than 300,000, and a second polypropylene having a viscosity average molecular weight of not less than 300,000.
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