Patent ID: 7584860
Filing Date: 2009-09-08
Classification: B01D

Abstract:
1. A hydrophilic body consisting essentially of: a porous membrane having hydrophobic properties and comprising expanded polytetrafluoroethylene, woven polytetrafluoroethylene, or non woven polytetrafluoroethylene, said expanded polytetrafluoroethylene comprising a plurality of nodes interconnected by a plurality of fibrils, each said node and said fibril having an outer surface, said woven polytetrafluoroethylene and said non-woven polytetrafluoroethylene comprising a plurality of polytetrafluoroethylene fibers, each said polytetrafluoroethylene fiber having an outer surface, said porous membrane having a plurality of pores; and a coating formed from a coating composition deposited on at least a portion of said surfaces of said nodes and fibrils, or said surfaces of said polytetrafluoroethylene fibers of said woven polytetrafluoroethane, or said surfaces of said polytetrafluoroethylene fibers of said non-woven polytetrafluoroethane without blocking said pores of said porous membrane, said coating having hydrophilic properties and comprising at least one of an organofunctional siloxane and a polyether urethane polymer, said hydrophilic body having a water permeability of between about 10 and about 40 milliliters per minute per square centimeter at about 27 inches of mercury vacuum, and said hydrophilic body retains water wettability and can be dried and subsequently flow liquid without pre-wetting.