Patent ID: 7829477

Claim:
A method of providing water repellency, oil repellency, soil resistance, soil release, stain resistance and stain release to a substrate comprising contacting said substrate with a composition comprising a copolymer having repeating units of Formula 1 in any sequence: wherein R f is a straight or branched perfluoroalkyl group having from about 2 to about 8 carbon atoms, or a mixture thereof, which is optionally interrupted by at least one oxygen atom, Q is alkylene of 1 to about 15 carbon atoms, hydroxyalkylene of 2 to about 15 carbon atoms, —O(C n H 2n )—, —(CH 2 CF 2 ) m (CH 2 ) n —, —CONR 1 (C n H 2n )—, —(C n H 2n )OCONR 1 (C n H 2n )—, (—CONR 1 CH 2 ) 2 CH—, —SO 2 N(R 1 )(C n H 2n )—, or —(C n H 2n )SO 2 N(R 1 )(C n H 2n )—, each R 1 is independently H or alkyl of 1 to about 4 carbon atoms, each n is independently 1 to about 15, each m is independently 1 to about 4, Z is hydrogen or methyl, x is a positive integer, y is zero or a positive integer, t is a positive integer, and M is H + , alkali metal cation, alkaline earth metal cation, or ammonium.