Patent ID: 7495118

Claim:
A fluorochemical composition comprising: one or more silanes of the formula: R f SO 2 —N(R)(C n H 2n )CHZ(C m H 2m )N(R′)SO 2 R f (I) wherein R f is each independently C p F 2p+1 , where p is 2 to 5; R is a C 1 to C 4 alkyl or an aryl group; m and n are both integers greater than 0; Z is H or a group of the formula: (C m′ H 2m′ )X-Q-Si(Y) 3 , in which m′ is 0 to 4, X is O, S or NH and Q is —C(O)NH—(CH 2 ) n′ — or —(CH 2 ) n′ —, and R is as defined above; and R′ is R or, when Z is H, a group of the formula —(CH 2 ) n′ —Si(Y) 3 ; n′ is an integer of 1 to 20, and Y is a hydrolysable group.