Patent ID: 6228477
Filing Date: 2001-05-08
Classification: B01D,D06M,Y10T

Abstract:
A composite membrane comprising:a membrane having a structure of nodes connected by fibrils in which surfaces of said nodes and fibrils define a plurality of interconnecting pores extending through said membrane and between major sides of said membrane;said membrane being moisture vapor transmissive, air permeable, wind and liquid penetration resistant and made from a material tending to absorb oils and contaminating agents; anda conformal coating disposed on surfaces of said nodes and fibrils, said conformal coating comprising an acrylic-based polymer with fluorocarbon side chains applied from a polymer dispersion diluted with a water miscible wetting agent;said coating coalesced on surfaces of said nodes and fibrils to provide oil and contaminating agent resistance to said composite membrane without completely blocking the pores in said membrane.