Patent ID: 7665615
Filing Date: 2010-02-23
Classification: B01D

Abstract:
1. A composite article comprising: a base material; a porous membrane laminated with the base material, said porous membrane having hydrophobic properties and comprising at least one of expanded polytetrafluoroethylene, woven polytetrafluoroethylene, and non woven polytetrafluoroethylene; and a coating layer formed on at least a portion of said porous membrane, said coating layer having hydrophilic properties and comprising at least one of an organofunctional siloxane and a polyether urethane polymer, wherein said composite article retains water wetability and can be dried and subsequently flow liquid without pre-wetting, and comprises a water permeability of between about 5 and about 60 milliliters per minute per square centimeter at about 27 inches of mercury vacuum.