Patent ID: 7284668
Filing Date: 2007-10-23
Classification: B01D

Abstract:
1. A method for the preparation of a clean, caustic resistant porous membrane, said membrane comprising a porous membrane substrate and a heat stable biomolecule resistant surface coating, said method comprising the steps of: a. providing a porous membrane substrate; b. optionally washing said porous membrane substrate with a wetting liquid to wet the surfaces thereof; c. optionally washing said wet porous membrane substrate with a second wetting liquid to replace said first wetting liquid, leaving said porous membrane substrate wetted with said second liquid; d. contacting the surface of said porous membrane substrate with a reactant solution containing: e. removing the membrane substrate from the solution; f. polymerizing said monomers to form said heat stable biomolecule resistant surface; g. washing said membrane to form the first coating on the porous substrate; h. contacting the membrane from step (g) with an aqueous solution of at least one monofunctional monomers having hydrophilic functional groups, a polyfunctional cross-linking agent and a photo initiator; i. removing the porous membrane in step (h) from the aqueous solution; j. exposing the membrane from step (i) to ultraviolet light; k. washing the membrane to form the second coating on the porous membrane; and l. drying the membrane.