Patent ID: 7335786

Claim:
A compound of the formula wherein R f is a fluorine-containing group; R 1 is a covalent bond, a polyvalent alkylene or arylene group, or combinations thereof, said alkylene groups optionally containing one or more catenary oxygen or nitrogen atoms; R 2 is of the formula: wherein X is —O—, —S—, or —NR 4 —, where R 4 is H or C 1 -C 4 alkyl; R 5 is H, C 1 -C 4 alkyl, or —CH 2 CH 2 —C(O)—X 2 —R 6 —Si(Y p )(R 7 ) 3−p ; R 6 is a divalent alkylene group, said alkylene groups optionally containing one or more catenary oxygen atoms; Y is a hydrolysable group; R 7 is a monovalent alkyl or aryl group; p is 1, 2 or 3; and x and y are each independently at least 1, and z is 1 or 2.