Patent ID: 7405296

Claim:
A perfluoropolyether compound of formula: wherein R f is a (per) fluoropolyoxyalkylene chain formed of one or more repeating units, statistically placed along the chain, having the following structure: (CFXO), (CF 2 CF 2 O), (CF 2 CF 2 CF 2 O), (CF 2 CF 2 CF 2 CF 2 O), (CR 6 R 7 CF 2 CF 2 O), (CF(CF 3 )CF 2 O), (CF 2 CF(CF 3 )O), wherein X=F, CF 3 ; R 6 and R 7 , equal to or different from each other, are selected from H, Cl, or perfluoroalkyl from 1 to 4 carbon atoms, said Rf having a number average molecular weight in the range 500-10,000; W 1 , W 2 , equal to or different from each other, are —F or —CF 3 ; T 1 is equal to —CHA a —B a (CH 2 CH 2 O) na — wherein A a ═H, CF 3 ; B a ═O, S, NH; na is an integer from 0 to 6, extremes included; T 2 is equal to —F, —CF 3 , —C 2 F 5 , —(C 2 F 4 )Cl, or a group of formula: Q 1 , Q 2 , equal to or different from each other, are a perfluoropolyoxyalkylene chain of formula: -T1-CFW 1 —O—Rf—CFW 2 -T′ 2 , wherein T′ 2 is equal to —F, —CF 3 , —C 2 F 5 , (C 2 F 4 )Cl; T 1 , W 1 and W 2 have the above meaning; or a group of formula: wherein B is equal to O, S, NH; R 1 , R 2 , R 3 , R 4 , R 5 , equal to or different from each other, are selected from H, F, NO 2 , CN, linear or branched C 1 -C 8 perfluoroalkyl, carboxyl, phenyl (Ph), O-Ph, NH-Ph, S-Ph; with the proviso that at least one of Q 1 and Q 2 is equal to: