Patent ID: 7399735

Claim:
Compounds formed of (per)fluoropolyether chains and end groups having a pyridine structure, having the following structural formula: T 1 -CW 1 —O—R f —CW 2 -T 2 (I) wherein T 1 , T 2 , equal to or different from each other, have the following meanings: F, CF 3 , C 2 F 5 , (C 2 F 4 ) Cl: CH 2 —B—Y, CH(CF 3 )O—Y, wherein: B═O, S; wherein R 1 , R 2 , R 3 , R 4 , equal to or different from each other, are H, F, C 1 -C 8 linear or branched perfluoroalkyl, NO 2 , ON, preferably H and/or C 1 -C 8 linear or branched perfluoroalkyl; with the proviso that at least one of the two end groups T 1 , T 2 is CH 2 —B—Y or CH (CF 3 )O—Y as above defined; W 1 , W 2 , equal to or different from each other, are —F, —CF 3 ; Rf is a (per)fluoropolyoxyalkylene chain formed of one or more repeating units, statistically distributed in 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 5 R 6 CF 2 CF 2 O), CF(CF 3 )CF 2 O), (CF 2 CF(CF 3 )O), wherein X=F, CF 3 ; R 5 and R 6 , equal to or different from each other, are selected from H, Cl, perfluoroalkyl from 1 to 4 carbon atoms; the number average molecular weight of R f being from 400 to 10,000, preferably from 800 to 5,000.