Patent ID: 6465050
Filing Date: 2002-10-15
Classification: B01D

Abstract:
A method for modifying the inner and outer surfaces of a porous polyethersulfone medium comprising the steps of:(a) coating a porous polyethersulfone medium having an average pore size in the range of between about 0.1 and 100 micrometers with a solution containing 0.25-3 wt % of polyalkene oxide polymer and 0.1-1 wt % of a monomer having at least two polymerizable vinyl groups which are capable of polymerizing upon exposure to plasma; (b) placing the coated porous medium in plasma processing equipment; and (c) plasma-polymerizing the monomer in-situ to form a modified surface atop the entire porous medium under conditions which avoid any substantial reduction of void volume, wherein the modified porous medium is non-cracking when folded for use as a pleated cartridge filter and has a permanent non-extractable hydrophilic coating.