Patent ID: 7842626

Claim:
A composition of formula (I) wherein A is selected from the group consisting of: hydrogen, C 1 -C 5 straight and branched chain alkyl, phenyl, benzyl, and —C(O)—Y—R; Y is independently —O— or —NH—; n is an integer of 0 to 10; R is a monovalent group having 1 to 40 carbon atoms; B is selected from the group consisting of: —O—, —NH—, and a covalent bond; R f is a monovalent group is selected from the group consisting of formulas (IIa), (IIb), (IIc) and (IId): wherein m is an integer of 0 to 4; u and t are, independently, integers of 1 to 10; q and r are, independently, integers of 1 to 3; R f 1 is a C 1 -C 6 linear or branched perfluoroalkyl group, optionally interrupted by one to five ether oxygen atoms, or a C 6 perfluorinated aryl group; R f 2 is a C 1 -C 6 linear or branched perfluoroalkyl group; and R f 3 is a C 1 to C 7 linear or branched perfluoroalkyl group, optionally interrupted by one to three ether oxygen atoms.