Asymmetric porous polytetrafluoroethylene membrane and process for preparing the same
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United States of America Patent
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Feb 8, 2005
Grant Date -
May 15, 2003
app pub date -
Oct 28, 2002
filing date -
Oct 31, 2001
priority date (Note) -
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Abstract
The present invention relates to an asymmetric porous polytetrafluoroethylene membrane comprising a dense skin layer and a continuously foamed porous layer, (1) the dense skin layer having a surface roughness Ra of 20 to 165 nm; (2) the dense skin layer having a contact angle for water of 120 to 135.degree.; (3) the porous layer having a maximum pore diameter of 0.03 to 1.0 .mu.m; and (4) the membrane having a total porosity of 20 to 70%. The asymmetric porous PTFE membrane has an ability to separate each liquid component from a liquid-liquid homogeneous mixture in addition to known properties such as water permeability resistance, gas permeability, sealing property and electric property, wherein change of these properties over time is small.
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