| 摘要 |
The invention pertains to a fluoroelastonner composition comprising: - at least one fluoroelastomer [perfluoroelastomer (A)], said fluoroelastomer (A) comprising iodine and/or bromine atoms and having a backbone comprising: - recurring units derived from tetrafluoroethylene (TFE); - recurring units derived from at least one perfluorinated monomer selected from the group consisting of: - perfluoroalkylvinylethers complying with formula CF2=CFORf 1 in which Rn is a C1-C6 perfluoroalkyl (monomers of this type being referred to, herein after, as PAVE), e.g. -CF3, -C2F5, -C3F7; - perfluoro-oxyalkylvinylethers complying with formula CF2=CFOX0, in which X0 can be (i) a C1-C12 perfluorooxyalkyl having one or more ether groups, e.g. -C2F5 -O-CF3; or (ii) a group of formula -CF2ORf2 in which Rf2 is a C1-C6 perfluoroalkyl, e.g. -CF3, -C2F5, -C3F7 (monomers of this type being referred to, herein after, as MOVE); - recurring units derived from vinylidene fluoride (VDF) in an amount of up to 30 % by moles, with respect to the total moles of recurring units; and - optionally, recurring units derived from at least one perfluorinated C3-C8 alpha-olefin, in an amount of up to 5 % moles; - optionally, recurring units derived from at least one fluorine-free alpha-olefin, in an amount of up to 10 % moles; - from 0.5 to 5 weight parts, per 100 parts by weight of said fluoroelastomer (A), of at least one polyunsaturated compound; - from 0.1 to 3 weight parts, per 100 parts by weight of said fluoroelastomer (A), of at least one organic peroxide; - from 0.1 to 3 weight parts, per 100 parts by weight of said fluoroelastomer (A), of at least one organic base [base (B)] selected from the group consisting of: (i) non-aromatic primary amines or amides complying with general formula (B1m) or (Bid): Rbm-[C(0)]t-NH2 (B1m) H2N-[C(O)]t'-Rdm-[C(O)]t"-NH2 (B1d) wherein: - each of t, t' and t", equal to or different from each other and at each occurrence is zero or 1; - Rbm is a monovalent hydrocarbon non-aromatic group having 12 to 30 carbon atoms; - Rbm is a divalent hydrocarbon non-aromatic group having 6 to 30 carbon atoms; and (ii) cycloaliphatic secondary or tertiary amines complying with general formula (B2m) or (B2d) wherein: - Cy represents a divalent aliphatic group comprising at least 4 carbon atoms, optionally comprising one or more than one ethylenically unsaturated double bond, and optionally comprising one or more catenary nitrogen atoms, forming a cycle with the nitrogen atom which is connected thereto; - Cy' represent a trivalent aliphatic group comprising at least 5 carbon atoms, optionally comprising one or more than one ethylenically unsaturated double bond, and optionally comprising one or more catenary nitrogen atoms, forming a cycle with the nitrogen atom which is connected thereto. |
