Microporous high density polyethylene film and preparing method thereof
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United States of America Patent
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Issued Date -
Mar 8, 2007
app pub date -
Jun 18, 2005
filing date -
May 16, 2005
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Abandoned
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Abstract
The present invention discloses a microporous high-density polyethylene film for a battery separator, and process for preparing the same. The microporous high-density polyethylene film according to the present invention comprises of high-density polyethylene with weight average molecular weight of 2.times.10.sup.5.about.4.times.10.sup.5, containing not more than 5 wt % of molecules with molecular weight of 1.times.10.sup.4 or less and not more than 5 wt % of molecules with molecular weight of 1.times.10.sup.6 or more, and has the properties of puncture strength of 0.22 N/.mu.m or more, Darcy's permeability constant of 1.8.times.10.sup.-5 Darcy or more, and shrinkage of 4% or less in machine and transverse direction, respectively. Particularly, the microporous high-density polyethylene film has excellent extrusion-compoundability and stretchability with high productivity and enhances performances and stability of the battery using the film.
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