Method of making a composite microporous membrane
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United States of America Patent
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Issued Date -
Sep 15, 2005
app pub date -
Mar 9, 2004
filing date -
Mar 9, 2004
priority date (Note) -
Abandoned
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Abstract
A method of making a composite microporous membrane includes the steps of: coating a nonporous precursor film with a polymer composition, and then stretching the coated nonporous precursor. Stretching includes a first stretching conducted at a first temperature and a first stretching rate and a second stretching conducted at a second temperature and a second stretching rate. The first stretching rate and the second stretching rate are different.
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