(PER) fluoropolyether compounds

Compounds having formula:

• wherein A and A1, 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 C1-C8 (per) fluoroalkyl;
• linear or branched C1-C15 (per) fluorooxyalkyl optionally containing one or more oxygen atoms;
• NO2;
• CN;
• OH;
• and linear or branched C1-C8 alkyl;
• linear or branched C1-C8 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—CH2—CFW1—O—Rf—CFW2—CH2—Y—
• wherein:
• Y=O or S;
• W1 and W2, equal or different, are F or CF3;
• Rf 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), (C2F4O), (CF2CF2CF2O), (CF2CF2CF2CF2O), (CR5R6CF2CF2O), or (C3F6O);
• wherein X is F or CF3;
• R5 and R6, 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 Rf having a number average molecular weight between 500 and 10,000;
• R1, R2, R3, equal to or different from each other, are selected from the group consisting of H;
• NO2;
• CN;
• linear or branched C1-C8 and perfluoroalkyl, optionally containing chlorine and/or heteroatoms.