Asymmetric porous polytetrafluoroethylene membrane for clothing
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United States of America Patent
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Dec 18, 2007
Grant Date -
Oct 7, 2004
app pub date -
Mar 25, 2004
filing date -
Apr 2, 2003
priority date (Note) -
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Abstract
The present invention provides an asymmetric porous PTFE membrane for clothing having little change over time and conventionally known properties of a porous PTFE molded article such as water permeability resistance, air permeability, sealing properties and electric properties, in which durability and water vapor permeability are improved by strengthening adhesion strength with fabric. Specifically, the present invention relates to an asymmetric porous PTFE membrane for clothing comprising a dense skin layer and a continuously foamed porous layer, wherein(1) the contact angle of water to the surface of the skin layer is 120 to 140.degree.; and(2) the diffuse reflectance of light of the skin layer is 91 to 94%.
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