COMPOSITE MEMBRANE HAVING OLEOPHOBIC PROPERTIES

摘要

An air permeable composite article (12) that in one embodiment includes a porous base membrane (16) that includes a plurality of nodes (22) and fibrils (24) defining a plurality of interconnecting pores (26) extending through the porous base membrane with each node and fibril having a surface. The composite article also includes a precipitated coating material (28) deposited on the surfaces of the pluralit y 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 contaminatin g agent resistance of at least a number six measured in accordance with AATCC 118 te st method.