| abstract |
Compounds formed of (per)fluoropolyether chains and end groupsnhaving a pyridine structure, with structural formula:n T 1 -CW 1 -O-R f -CW 2 -T 2 nwherein nT 1 , T 2 , equal to or different from each other, have the followingnmeanings:n F, CF 3 , C 2 F 5 , (C 2 F 4 )Cl; CH 2 -B-Y, CH(CF 3 )O-Y, wherein:n B = O, S;n n wherein R 1 , R 2 , R 3 , R 4 , equal to or different from eeachnother, are H, F, C 1 -C 8 linear or branched perfluoroalkyl, NO 2 , CN; nwith the proviso that at least one of the two end groups T 1 ,nT 2 is CH 2 -B-Y or CH(CF 3 )O-Y as above defined; nW 1 , W 2 , equal to or different from each other, are -F, -CF 3 ; nRf is a (per)fluoropolyoxyalkylene chain having a numbernaverage molecular weight from 400 to 10,000. |