Patent ID: 7569715

Claim:
A fluorochemical composition comprising: at least one silane of the formula (I): R fa SO 2 —N(R)(C n H 2n )CHZ(C m H 2m )N(R′)SO 2 R fb I wherein R fa is C p F 2p+1 , wherein p is an integer from 1 to 5; R fb is C q F 2q+1 , wherein q is an integer from 1 to 5, with the proviso that at least one of p or q is 1; R is a C 1 to C 6 alkyl group or an aryl group; m and n are each independently integers from 1 to 20; Z is selected from the group consisting of hydrogen and a group of the formula —(C t H 2t )—X-Q-Si(Y′) w (Y) 3−w , in which t is an integer from 0 to 4; —X— is selected from the group consisting of —O—, —S— and —NH—; -Q- is selected from the group consisting of —C(O)NH—(CH 2 ) v — and —(CH 2 ) v —; v is an integer from 1 to 20; Y is a hydrolyzable group; Y′ is a non-hydrolyzable group; and w is an integer from 0 to 2; and R′ is selected from the group consisting of a C 1 to C 6 alkyl group, an aryl group, and a group of the formula —(CH 2 ) v —Si(Y′) w (Y) 3−w , with the proviso that when Z is hydrogen, R′ is a group of the formula —(CH 2 ) v —Si(Y′) w (Y) 3−w .