Patent ID: 7157117
Filing Date: 2007-01-02
Classification: B01D,B05D,C23C,D04H,D06M,Y10T

Abstract:
1. A process for functionalizing a porous substrate with permeable pore walls to impart a particular functionality to the substrate while retaining its permeability, comprising the following steps: (a) pretreating said substrate in a plasma field; (b) flash evaporating a monomer having said functionality in a vacuum chamber to produce a vapor; (c) condensing the vapor on the porous substrate within about one second of the pretreating step to produce a film of said monomer coating the pore walls of the porous substrate; and (d) curing the film to produce a functionalized polymeric layer the pore walls of the porous substrate; wherein said condensing step is carried out under vapor-density and residence-time conditions that limit said polymeric layer to a maximum thickness of about 3.0 μm.