Patent ID: 6197426
Filing Date: 2001-03-06
Classification: C08F,D06M,Y10T

Abstract:
A method of treating a substrate comprising applying to the substrate a fluorochemical composition comprising fluorochemical copolymer derived from at least one fluorochemical monomer A, at least one monomer B, at least one monomer C and at least one monomer D wherein:(a) the fluorochemical monomer A contains a fluoroaliphatic group and is an ester of an .alpha., .beta.-ethylenically unsaturated carboxylic acid,(b) the monomer B is an ester of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid,(c) the monomer C is an ethylenically unsaturated dicarboxylic acid anhydride,(d) the monomer D is an ester of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid,(e) the fluorochemical monomer A and the monomers B and C contain only one polymerizable group and monomer D contains, as a second polymerizable group, an ethylenically unsaturated group that has a higher affinity to copolymerize with the monomer C than fluorochemical monomer A or monomers B or D.