Patent ID: 7652115

Claim:
A composition comprising a mixture of: (a) a 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 represent —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 C 1 -C 4 alkoxy group, a halide, an acyloxy group, or a polyoxyalkylene group; and x is 0 or 1; and (b) an organic solvent.