Patent ID: 6486291
Filing Date: 2002-11-26
Classification: B01D,C08G,D06M,D06N,Y10T

Abstract:
A method of making a coated porous material comprising:applying a curable crosslinkable coating composition comprising fluorocarbon urethane precursors including: (a) a polyisocyanate; (b) a polyhydric alcohol; wherein at least one member of (a) or (b) has a functionality of greater than 2, and (c) a perfluoroalkyl alcohol of the formula Râ€”(CH2)xâ€”OH, in which R is where x is 1-12; n is 3-20, and R1 is H, alkyl of 1 to 4 carbon atoms or â€”(CH2)xâ€”OH in an organic solvent, to a porous material in an amount sufficient to cover the material, and drying the coating sufficient to remove the solvent and to promote curing or cross-linking, to produce a coated material which exhibits air permeability and repellency to liquids having a surface tension of equal to or greater than 20 dynes/cm.