Composite membrane having oleophobic properties
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United States of America Patent
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Aug 5, 2008
Grant Date -
Jan 19, 2006
app pub date -
Aug 15, 2005
filing date -
Sep 20, 2002
priority date (Note) -
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Abstract
An air permeable composite article that in one embodiment includes a porous base membrane that includes a plurality of nodes and fibrils defining a plurality of interconnecting pores extending through the porous base membrane with each node and fibril having a surface. The composite article also includes a precipitated coating material deposited on the surfaces of the plurality of nodes and fibrils. The coating material includes a copolymer formed from a fluorinated acrylate or methacrylate, an n-alkyl acrylate or methacrylate, and an isocyanate crosslinker. The precipitated coating material provides oil and contaminating agent resistance of at least a number six measured in accordance with AATCC 118 test method.
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