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The invention pertains to a (per)fluoroelastomer composition comprising: at least one (per)fluoroelastomer fluoroelastomer (A); andfrom 0.1 to 30 weight parts, per hundred parts of fluoroelastomer (A), of at least one perfluoropolyether block copolymer polymer (E) comprising:A) one or more (per)fluo

The invention pertains to a (per)fluoroelastomer composition comprising: at least one (per)fluoroelastomer fluoroelastomer (A); andfrom 0.1 to 30 weight parts, per hundred parts of fluoroelastomer (A), of at least one perfluoropolyether block copolymer polymer (E) comprising:A) one or more (per)fluoropolyoxyalkylene segment (chain Rf), that is to say a segment comprising recurring units having at least one catenary ether bond and at least one fluorocarbon moiety, andB) one or more polyalkylene segment (chain Ra) comprising recurring units of formula: —(CR1R2—CR3R4)—wherein R1, R2, R3, R4, equal to or different from each other, are selected from the group consisting of H, halogens (preferably F, Cl); C1-C6 (hydro)carbon groups, optionally containing fluorine or other heteroatoms, preferably perfluoroalkyl or (per)fluorooxyalkyl.

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1. A (per)fluoroelastomer composition comprising: at least one (per)fluoroelastomer (A); andfrom 0.1 to 30 weight parts, per hundred parts of (per)fluoroelastomer (A), of at least one perfluoropolyether block copolymer (E) comprising: one or more (per)fluoropolyoxyalkylene segment (chain Rf), said (

1. A (per)fluoroelastomer composition comprising: at least one (per)fluoroelastomer (A); andfrom 0.1 to 30 weight parts, per hundred parts of (per)fluoroelastomer (A), of at least one perfluoropolyether block copolymer (E) comprising: one or more (per)fluoropolyoxyalkylene segment (chain Rf), said (per)fluoropolyoxyalkylene segment comprising recurring units having at least one catenary ether bond and at least one fluorocarbon moiety, andone or more polyalkylene segment (chain Ra) comprising recurring units of formula: —(CR1eR2e—CR3eR4e)— wherein R1e, R2e, R3e, R4e, equal to or different from each other, are selected from the group consisting of H, halogens, and C1-C6 (hydro)carbon groups, optionally containing fluorine or other heteroatoms andwherein copolymer (E) further comprises at least one per(halo)fluorinated non-aromatic cyclic moiety having at least two sp3 hybridized carbon atoms, wherein at least two of the sp3 hybridized carbon atoms of the moiety are chemically bound to at least two chains Rf, and wherein the moiety optionally comprises conjugated or non conjugated double bond(s). 2. The (per)fluoroelastomer composition of claim 1, wherein (per)fluoroelastomer (A) comprises recurring units derived from at least one (per)fluorinated monomer selected from the group consisting of: C2-C8 fluoro- and/or perfluoroolefins;C2-C8 hydrogenated monofluoroolefins;(per)fluoroalkylethylenes complying with formula CH═CH—Rf0, wherein Rf0 is a C1-C6 (per)fluoroalkyl or a C1-C6 (per)fluorooxyalkyl having one or more ether groups;chloro- and/or bromo- and/or iodo-C2-C6 fluoroolefins;fluoroalkylvinylethers complying with formula CF2═CFORf1 wherein Rf1 is a C1-C6 fluoro- or perfluoroalkyl;hydrofluoroalkylvinylethers complying with formula CH2═CFORf1 wherein Rf1 is a C1-C6 fluoro- or perfluoroalkyl;fluoro-oxyalkylvinylethers complying with formula CF2═CFOX0, wherein X0 is a C1-C12 oxyalkyl, or a C1-C12 (per)fluorooxyalkyl having one or more ether groups;fluoroalkyl-methoxy-vinylethers complying with formula CF2═CFOCF2ORf2 wherein Rf2 is a C1-C6 fluoro- or perfluoroalkyl, or a C1-C6 (per)fluorooxyalkyl having one or more ether groups;functional fluoro-alkylvinylethers complying with formula CF2═CFOY0, wherein Y0 is a C1-C12 alkyl or (per)fluoroalkyl, or a C1-C12 oxyalkyl or a C1-C12 (per)fluorooxyalkyl, and wherein Y0 group comprises a carboxylic or sulfonic acid group, in its acid, acid halide or salt form; andfluorodioxoles, of formula: wherein each of Rf3, Rf4, Rf5, Rf6, equal or different each other, is independently a fluorine atom, a C1-C6 fluoro- or per(halo)fluoroalkyl, optionally comprising one or more oxygen atom. 3. The (per)fluoroelastomer composition of claim 1, wherein (per)fluoroelastomer (A) is selected from the group consisting of: (1) VDF-based copolymers, wherein said VDF is copolymerized with at least one comonomer selected from the group consisting of: (a) C2-C8 perfluoroolefins;(b) hydrogen-containing C2-C8 olefins;(c) C2-C8 chloro and/or bromo and/or iodo-fluoroolefins;(d) (per)fluoroalkylvinylethers (PAVE) of formula CF2═CFORf, wherein Rf is a C1-C6 (per)fluoroalkyl group;(e) (per)fluoro-oxy-alkylvinylethers of formula CF2═CFOX, wherein X is a C1-C12 ((per)fluoro)-oxyalkyl comprising catenary oxygen atoms;(f) (per)fluorodioxoles having formula:  wherein Rf3, Rf4, Rf5, Rf6, equal or different from each other, are independently selected from the group consisting of fluorine atoms and C1-C6 (per)fluoroalkyl groups, optionally comprising one or more than one oxygen atom;(g) (Per)fluoro-methoxy-vinylethers (MOVE) having formula: CFX2═CX2OCF2OR″f wherein R″f is selected among C1-C6 (per)fluoroalkyls, linear or branched; C5-C6 cyclic (per)fluoroalkyls; and C2-C6 (per)fluorooxyalkyls, linear or branched, comprising from 1 to 3 catenary oxygen atoms, and X2is F or H; and(h) C2-C8 non-fluorinated olefins (Ol); and(2) TFE-based copolymers, wherein TFE is copolymerized with at least one comonomer selected from the group consisting of: (c) C2-C8 chloro and/or bromo and/or iodo-fluoroolefins;(d) (per)fluoroalkylvinylethers (PAVE) of formula CF2 ═CFORf, wherein Rf is a C1-C6 (per)fluoroalkyl group;(e) (per)fluoro-oxy-alkylvinylethers of formula CF2 ═CFOX, wherein X is a C1-C12 ((per)fluoro)-oxyalkyl comprising catenary oxygen atoms;(g) (per)fluoro-methoxy-vinylethers (MOVE) having formula: CFX2 =CX2OCF2OR″f wherein R″f is selected among C1-C6 (per)fluoroalkyls , linear or branched; C5-C6 cyclic (per)fluoroalkyls; and C2-C6 (per)fluorooxyalkyls, linear or branched, comprising from 1 to 3 catenary oxygen atoms, and X2 is F or H; and(h) C2-C8 non-fluorinated olefins (Ol); and: (i) perfluorovinyl ethers containing cyanide groups. 4. The (per)fluoroelastomer composition of claim 1, wherein (per)fluoroelastomer (A) comprises recurring units derived from a bis-olefin (OF) having general formula: wherein R1, R2, R3, R4, R5 and R6, equal or different from each other, are H or C1-C5 alkyl; Z is a linear or branched C1-C18 alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical. 5. The (per)fluoroelastomer composition of claim 4, wherein said bis-olefin (OF) is selected from the group consisting of those complying with formulae (OF-1), (OF-2) and (OF-3): wherein j is an integer between 2 and 10, and R1, R2, R3, R4, equal or different from each other, are H, F or C1-5 alkyl or (per)fluoroalkyl group; wherein each of A, equal or different from each other and at each occurrence, is independently selected from the group consisting of F, Cl, and H; each of B, equal or different from each other and at each occurrence, is independently selected from the group consisting of F, Cl, H and ORB, wherein said RB is a branched or straight chain alkyl radical which can be partially, substantially or completely fluorinated or chlorinated; said E is a divalent group having 2 to 10 carbon atom, optionally fluorinated, which may be inserted with ether linkages; wherein E, A and B have the same meaning as above defined; R5, R6, R7, equal or different from each other, are H, F or C1-5 alkyl or (per)fluoroalkyl group. 6. The (per)fluoraelastomer composition of claim 1, wherein said chain Rf of the copolymer (E) complies with formula: —(CF2CF2O)a′(CFYO)b′(CF2CFYO)c′(CF2O)d′(CF2(CF2)zCF2O)e′—,the recurring units being statistically distributed along the (per)fluoropolyoxyalkylene chain, wherein:Y is a C1-C5 perfluoro(oxy)alkyl group;z is 1 or 2; anda′, b′, c′, d′, e′ are integers ≧0. 7. The (per)fluoroelastomer composition of claim 1, wherein copolymer (E) complies with formula (IV): wherein: Xf and X′f, equal or different from each other are selected from the group consisting of halogen, and C1-C12 per(halo)fluorocarbon substituents;NA represents a per(halo)fluorinated non-aromatic cyclic moiety [moiety (NA)] optionally condensed with additional aromatic or non aromatic moieties, optionally having one or more conjugated or non conjugated double bond(s), optionally having one or more per(halo)fluorosubstituents and wherein said cyclic moiety comprises the two sp3 hybridized carbon bearing Tl-O-[A-B]z-[A-B′]z′-A- and -[A-B]z-[A-B′]z′-A-Tl′ substituents;w is an integer from 1 to 10;A is —(X)a—O-A′-(X′)b—, wherein A′ is a chain Rf having formula: —(CF2CF2O)a′(CFYO)b′(CF2CFYO)c′(CF2O)d′(CF2(CF2)zCF2O)e′—, the recurring units being statistically distributed along the (per)fluoropolyoxyalkylene chain, wherein: Y is a C1-C5 perfluoro(oxy)alkyl group;z is 1 or 2;a′, b′, c′, d′, e′ are integers ≧0; X, X′, equal to or different from each other, are selected from —CF2—, —CF2CF2—, and —CF(CF3)—; a, b, equal to or different from each other, are integers equal to 0 or 1, with the proviso that the block A linked to the end group Tl-O— has a=1 and the block A linked to the end group T′l has b=0;B is a segment of recurring units derived from one or more olefins having formula: —[(CR1aR2a—CR3aR4a)j(CR5aR6a—CR7aR8a)j′]—   (formula Ia),wherein: j is an integer from 1 to 100, j′ is an integer from 0 to 100 with the proviso that (j+j′) is higher than 2 and lower than 100; R1a, R2a, R3a, R4a, R5a, R6a,R7a, R8a, equal to or different from each other, are selected from the group consisting of halogen; H; and C1-C6 groups, optionally containing F or other heteroatoms said substituents R1a-R8a optionally containing one or more functional groups;z is an integer higher than or equal to 1; z′ is ≧0; z, z′ are such that the number average molecular weight of copolymer (E) is in the range 500-500,000;B′ is a segment otherwise complying with formula (Ia), having at least one of the substituents R1a to R8a different than those in block B; andTl and Tl′ equal to or different from each other, are selected from the group consisting of H, halogen, C1-3, (per)fluoroalkyls, C1-6 alkyls and C1-C30 functional end groups comprising heteroatoms chosen among O, S, N. 8. A cured article obtained from the (per)fluoroelastomer composition of claim 1. 9. The (per)fluoroelastomer composition of claim 1, wherein R1e, R2e, R3e, R4e, equal to or different from each other, are selected from the group consisting of H, F, Cl, perfluoroalkyl or (per)fluorooxyalkyl. 10. The (per)fluoroelastomer composition of claim 1, wherein (per)fluoroelastomer (A) comprises recurring units derived from at least one (per)fluorinated monomer selected from the group consisting of: tetrafluoroethylene (TFE), hexafluoropropene (HFP), pentafluoropropylene, and hexafluoroisobutylene;vinyl fluoride, 1,2-difluoroethylene, vinylidene fluoride (VDF) and trifluoroethylene (TrFE);chlorotrifluoroethylene (CTFE);fluoroalkylvinylethers complying with formula CF2═CFORfl in which Rfl is —CF3,—C2F5, —C3F7;hydrofluoroalkylvinylethers complying with formula CH2═CFORfl in which Rfl is —CF35 —C2F5, —C3F7 ;fluoro-oxyalkylvinylethers complying with formula CF2═CFOX0, in which X0 is perfluoro-2-propoxy-propyl;fluoroalkyl-methoxy-vinylethers complying with formula CF2═CFOCF2ORf2 in which Rf2 is -CF3, —C2F5, —C3F7, or -C2F5—O—CF3;fluorodioxoles, of formula: wherein each of Rf3, Rf4, Rf5, Rf6, equal or different each other, is independently a fluorine atom, —CF3, —C2F5, —C3F7, —OCF3, or —OCF2CF2OCF3. 11. The (per)fluoroelastomer composition of claim 1, wherein (per)fluoroelastomer (A) is selected from the group consisting of: (1) VDF-based copolymers, in which VDF is copolymerized with at least one comonomer selected from: (a) tetrafluoroethylene (TFE), hexafluoropropylene (HFP), hexafluoroisobutylene;(b) vinyl fluoride (VF), trifluoroethylene (TrFE), perfluoroalkyl ethylenes of formula CH2 ═CH-Rf, wherein Rf is a C1-C6 perfluoroalkyl group;(c) chlorotrifluoroethylene (CTFE);(d) (per)fluoroalkylvinylethers (PAVE) of formula CF2 ═CFORf, wherein Rf is CF3, C2F5 or C3F7;(e) (per)fluoro-oxy-alkylvinylethers of formula CF2 ═CFOX, wherein X is a perfluoro-2-propoxypropyl group;(f) (per)fluorodioxoles of formula:  wherein Rf3, Rf4, Rf5 5 Rf6, equal or different from each other, are independently selected from the group consisting of fluorine atoms, -CF3, —C2F5, —C3F7, —OCF3, and —OCF2CF2OCF3;(g) (per)fluoro-methoxy-vinylethers (MOVE) of formula: CFX2═CX2OCF2OR″f  wherein X2 is F and R″f is —CF2CF3 (MOVE1); —CF2CF2OCF3 (MOVE2); or —CF3 (MOVE3); and(h) ethylene and propylene; and(2) TFE-based copolymers, in which TFE is copolymerized with at least one comonomer chosen from classes (c), (d), (e), (g), (h) as above detailed and the followings: (c) chlorotrifluoroethylene (CTFE);(d) (per)fluoroalkylvinylethers (PAVE) of formula CF2 ═CFORf, wherein Rf is CF3, C2F5 or C3F7;(e) (per)fluoro-oxy-alkylvinylethers of formula CF2 ═CFOX, wherein X is a perfluoro-2-propoxypropyl group;(g) (per)fluoro-methoxy-vinylethers (MOVE) of formula: CFX2═CX2OCF2OR″f  wherein X2 is F and R″f is —CF2CF3 (MOVE1); —CF2CF2OCF3 (MOVE2); or —CF3 (MOVE3); and(h) ethylene and propylene. 12. The (per)fluoroelastomer composition of claim 5, wherein j is an integer between 4 and 8. 13. The (per)fluoroelastomer composition of claim 5, wherein E is a —(CF2)m— group and m is an integer from 3 to 5. 14. The (per)fluoroelastomer composition of claim 8, wherein Xf and X′f, equal or different from each other are selected from the group consisting of —F and C1-C12 perfluoroalkyl or perfluoroaryl groups. 15. The (per)fluoroelastomer composition of claim 8, wherein R1a, R2a, R3a, R4a, R5a, R6a, R7a, R8a, equal to or different from each other, are selected from F, Cl, H, perfluoroalkyl or (per)fluorooxyalkyl, said substituents R1a-R8a optionally containing one or more functional groups.