Patent ID: 7659231

Claim:
Compounds having formula: wherein A and A 1 , equal or different, are respectively H or an aromatic end group; optionally said aromatic group being substituted with one or more substituents selected from the group consisting of H; linear or branched C 1 -C 8 (per) fluoroalkyl; linear or branched C 1 -C 15 (per) fluorooxyalkyl optionally containing one or more oxygen atoms; NO 2 ; CN; OH; and linear or branched C 1 -C 8 alkyl; linear or branched C 1 -C 8 oxyalkyl, optionally containing one or more oxygen atoms; n is an integer, higher than zero, such that the number average molecular weight of the compound of formula (I) is in the range 1,800-50,000; T is a bivalent group —Y—CH 2 —CFW 1 —O—R f —CFW 2 —CH 2 —Y— wherein: Y=O or S; W 1 and W 2 , equal or different, are F or CF 3 ; R f is a (per) fluoropolyoxyalkylene chain comprising one or more repeating units, statistically distributed along the polymeric backbone, having one or more of the following structures: (CFXO), (C 2 F 4 O), (CF 2 CF 2 CF 2 O), (CF 2 CF 2 CF 2 CF 2 O), (CR 5 R 6 CF 2 CF 2 O), or (C 3 F 6 O); wherein X is F or CF 3 ; R 5 and R 6 , equal to or different from each other, are selected from the group consisting of H, Cl , and perfluoroalkyl from 1 to 4 carbon atoms, said R f having a number average molecular weight between 500 and 10,000; R 1 , R 2 , R 3 , equal to or different from each other, are selected from the group consisting of H; NO 2 ; CN; linear or branched C 1 -C 8 and perfluoroalkyl, optionally containing chlorine and/or heteroatoms.