Fluorinated polymers and resins prepared therefrom

Fluorinated polymers having the general formula:

• ##STR11## where the units x and y have a random distribution or a block distribution inside said polymer, and:
• x=an integer from 0 to 20, extremes included,
• y=an integer from 1 to 20, extremes included,
• B, B', independently of each other, are H or ##STR12## A=a radical of a fluorinated or non-fluorinated diol, containing one or more aromatic or cycloaliphatic or polycyclic rings;
• R.sub.f =a perfluoroalkylene radical deriving from the corresponding diol, comprising sequences of average molecular weight 500-7000 of fluorooxyalkylene units selected from the following classes:
• I--(C.sub.2 F.sub.4 O), (CF.sub.2 O) said units being randomly placed along the fluoropolyoxyalkylene chain;
• II--(C.sub.3 F.sub.6 O), (C.sub.2 F.sub.4 O), (CFXO) wherein X=F or CF.sub.3, said units being randomly placed along the fluoropolyoxyalkylene chain;
• III--(CH.sub.2 CF.sub.2 CF.sub.2 O) said units in the fluoropolyoxyalkylene chain being linked between them as follows:
• --(OCF.sub.2 CF.sub.2 CH.sub.2)--O--R'.sub.f --O--(CH.sub.2 CF.sub.2 CF.sub.2 O).sub.q --
• wherein R'.sub.f is a fluoroalkylene group and p and q are integer, p+q being higher than 2;
• IV-- ##STR13## said units being linked between them in the fluoropolyoxyalkylene chain as follows:
• ##STR14## wherein R.sub.f is a fluoroalkylene group, x is 0 or 1, a and b are integer and a+b higher than 2;
• V--(CF.sub.2 CF.sub.2 CF.sub.2 O);
• VI--(CF.sub.2 CF.sub.2 O);
• D=A or R.sub.f.