MICROPOROUS LAMINATED MEMBRANE AND METHOD FOR PRODUCING THE SAME
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United States of America Patent
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Oct 29, 2015
app pub date -
Mar 17, 2015
filing date -
Apr 24, 2014
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Abstract
Disclosed is a microporous laminated membrane including a nonwoven-fabric substrate and a microporous membrane. The microporous membrane is disposed on at least one side of the nonwoven-fabric substrate. The microporous membrane includes a multiplicity of interconnecting micropores. The micropores have an average pore diameter of from 0.01 to 10 μm. The microporous membrane has an arithmetic mean surface roughness Sa of 0.5 μm or less. The microporous laminated membrane has an air permeability of from 0.5 to 30 seconds. The microporous laminated membrane has a tensile strength of 4.0 N/15 mm or more. The microporous laminated membrane does not undergo interfacial peeling between the substrate and the microporous membrane as a result of a tape peel test.
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