Patent ID: 7638650

Claim:
A compound of formula (I): wherein k is 1 or 2; Y is —CH 2 CH(CF 3 ) 2 or —(CH 2 ) n R f ; X is hydrogen, —(CH 2 ) n R f , or —C(O)[CF(A)] p —B—R f ; B is a divalent radical selected from the group consisting of a covalent bond, —O— and —(CH 2 ) m —; m is an integer of 1 to about 10; p is an integer of 0 or 1, with the proviso that when p is 0, B is a covalent bond or —(CH 2 ) m —; n is an integer of from about 3 to about 10; A is —F or —CF 3 ; each R f is independently C 1 to C 6 perfluorinated linear or branched alkyl, optionally interrupted by one or more oxygens; R o is R o 1 or is a linear or branched alkyl having from about 10 to about 100 carbon atoms, interrupted or substituted by one or more hydrophilic groups selected from the group consisting of —O—, —OH, —NR—, —N(R) 2 , and —C(O)NR—, wherein a) the ratio of hydrophilic groups to carbon atoms is from about 1:2 to about 1:10; b) each carbon atom has at most one hydrophilic group bonded to it, and c) covalent bonding between hydrophilic groups is absent; R is hydrogen or a C 1 to C 4 linear or branched alkyl; and R o 1 is a linear or branched aliphatic group of from about 10 to about 100 carbon atoms, interrupted by about from about 5 to about 50 ether oxygens, wherein a) the ratio of ether oxygen to carbon atoms is from about 1:2 to about 1:3, b) each carbon atom has at most one ether oxygen atom bonded to it, and c) covalent bonding between ether oxygen atoms is absent; provided that 1) when Y is —(CH 2 ) n R f , R o is R o 1 ; 2) when X is hydrogen, Y is —CH 2 CH(CF 3 ) 2 ; and 3) when X is —(CH 2 ) n R f and Y is —(CH 2 ) n R f , R o is R o 1 .