Patent ID: 7358306

Claim:
Cured manufactured articles obtained from compositions comprising: hydrogen-containing rubbers, a curing agent, and curable perfluoropolyether polyurethanes obtained by reaction among the following compounds a) perfluoropolyether diols having a number average molecular weight from 2,000 to 5,000; b) diisocyanates of formula OCN—R—NCO (VIA) wherein R is a hydrogen-containing and/or fluorinated radical; c) hydrogen-containing diols selected from one or more of the following: c 1 ) C 2 -C 12 aliphatic diols; c 1A ) C 6 -C 18 (alkyl)cycloaliphatic or (alkyl)aromatic diols, optionally comprising in the molecule two aliphatic or aromatic rings having 6 carbon atoms; c 2 ) unsaturated aliphatic diol having formula: HO—CH 2 —CHOH—(CH 2 ) nb —(O)— nb′ —CH═CH 2 (XII) wherein nb is an integer from 1 to 12 and nb′ is an integer and is 0 or 1; c 3 ) unsaturated aliphatic diol having formula: HO—(CH 2 ) v′ —CH═CH—(CH 2 ) v″ —OH (XIII) wherein v′ and v″ are numbers higher than 1, such that v′+v″ is a number comprised between 2 and 10; c 4 ) butadiene oligomers or polymers having a number average molecular weight from 500 to 4,000 functionalized with terminal hydroxyl groups; c 5 ) mono-glycerides of C 11 -C 24 fat acids containing at least one unsaturation; c 6 ) trimethylolpropane monoallylether (TMPA): CH 3 —C(CH 2 OH) 2 —CH 2 OCH 2 —CH═CH 2 with the proviso that: when diisocyanate b) is used wherein R in formula (VIA) is different from —Ph—CH 2 —Ph—, at least one of the hydrogen-containing diols c) is used, selected from those belonging to the c 2 )-c 6 ) groups; the amount of the component a) in the final polyurethane being higher than 60% by weight, said polyurethanes being obtained by reacting component a) with b), and in a second step the reaction mixture with component c) to remove the —NCO excess, the sum of the equivalents of components a) and c) being equal to the equivalents of component b).