Crystalline polymer microporous membrane, method for producing same, and filter for filtration
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United States of America Patent
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Apr 10, 2012
Grant Date -
Mar 3, 2011
app pub date -
Nov 11, 2010
filing date -
May 19, 2006
priority date (Note) -
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Abstract
To provide a membrane capable of efficiently collecting fine particles for a long period of time, disclosed is a polytetrafluoroethylene microporous membrane wherein the mean pore size in the surface of the membrane is larger than the mean pore size in the back thereof and the mean pore size continuously changes from the surface toward the back.
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