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The compound of claim 1 wherein X is -C(O) p-B-R f, Y is -(CH 2) nR f, and R o is R o 1. The compound of claim 1 wherein X is -(CH 2) nR f, Y is -(CH 2) nR f, and R o is R o 1.
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The compound of claim 4 wherein R f is C 3F 7- B is -O- p is 1 and A is -CF 3. The compound of claim 1 wherein R o is R o 1. The compound of claim 1 wherein X is -C(O) p-B-R f and Y is -CH 2CH(CF 3) 2. The compound of claim 1 wherein X is -(CH 2) nR f and Y is -CH 2CH(CF 3) 2. The compound of claim 1 wherein X is H and Y is -CH 2CH(CF 3) 2. A compound of formula (I): wherein k is 1 or 2 Y is -CH 2CH(CF 3) 2 or -(CH 2) nR f X is hydrogen, -(CH 2) nR f, or -C(O) 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) nR f, R o is R o 1 2) when X is hydrogen, Y is -CH 2CH(CF 3) 2 and 3) when X is -(CH 2) nR f and Y is -(CH 2) nR f, R o is R o 1.