| abstract |
This invention provides air impermeable liquid-water resistant water-vapor-permeable composites that are highly oleophobic and some of which have enhanced water-vapor-permeable properties. In its broadest aspect, the composites comprise: a layer of a microporous polymer that is water-vapor permeable and which is oleophobic, and which is liquid water-resistant. This layer is in contact with an air-impermeable, liquid water resistant, polymer layer that is permeable to water-vapor molecules. The oleophobic microporous polymer layer confers enhanced oleophobicity. In another aspect, a third layer of a microporous, water-vapor-permeable polymer can also be present on the other side of the air-impermeable polymer layer. |