Patent ID: 7803894

Claim:
A composition comprising a mixture of: (a) a hydrolyzable perfluoropolyether urethane or urea silane or a mixture thereof comprising the reaction product of: (i) a fluorinated polyether compound of the formula (T′) y -R f -T (I) wherein R f is a monovalent or divalent polyfluoropolyether group; T and T′ each independently represents —CO 2 R 3 , where R 3 is hydroxyalkyl, or —C(O)N(R 1 )(R 2 ), where R 1 is hydroxyalkyl, dihydroxypropyl, or polyalkylenepolyamine and R 2 is hydrogen or R 1 ; and y is 0 or 1; and (ii) a silane compound of the formula T″-Q″-SiY 3-x R x (II) wherein T″ is —NCO; Q″ is —(C n H 2n )—, where n is 2 to 6; R is an alkyl group of 1-4 carbon atoms; Y is a hydrolyzable group; and x is 0, 1 or 2; (b) at least one non-fluorinated compound of the formula: (R′) q Si(Y′) p wherein R′ is a C 1 -C 4 alkyl group; p is 2, 3 or 4; q is 0, 1 or 2, wherein the sum of p+q is 4, and Y′ is a C 1 -C 4 alkoxy group; and (c) optionally, at least one non-fluorinated compound of the formula: R″Si(Y″) 3 wherein R″ is a C 6 -C 20 alkyl group and Y″ is a C 1 -C 4 alkoxy group, or a compound of the formula: L-Q″-Si(Y″) 3 , wherein L is a reactive functional group selected from an amino, an epoxy, a mercaptan, a methacrylate and an anhydride group; Q″ is —(C n H 2n )—, where n is 2 to 6; Y″ is a C 1 -C 4 alkoxy group.