A peroxide curable perfluoroelastomer comprising: recurring units derived from tetrafluoroethylene (TFE); recurring units derived from perfluoroethylvinylether (EVE), in an amount of between 2 and 17% by moles, with respect to total recurring units derived from TFE, perfluoromethylvinylether (MVE) a
A peroxide curable perfluoroelastomer comprising: recurring units derived from tetrafluoroethylene (TFE); recurring units derived from perfluoroethylvinylether (EVE), in an amount of between 2 and 17% by moles, with respect to total recurring units derived from TFE, perfluoromethylvinylether (MVE) and EVE; and recurring units derived from perfluoromethylvinylether (MVE), in an amount of between 23 and 35% by moles, with respect to total recurring units derived from TFE, perfluoromethylvinylether (MVE) and EVE. A process for its manufacture and its use for the manufacture of cured articles.
대표청구항▼
1. A peroxide curable perfluoroelastomer comprising: recurring units derived from tetrafluoroethylene (TFE);recurring units derived from perfluoroethylvinylether (EVE), in an amount of between 2 and 17% by moles, with respect to total recurring units derived from TFE, perfluoromethylvinylether (MVE)
1. A peroxide curable perfluoroelastomer comprising: recurring units derived from tetrafluoroethylene (TFE);recurring units derived from perfluoroethylvinylether (EVE), in an amount of between 2 and 17% by moles, with respect to total recurring units derived from TFE, perfluoromethylvinylether (MVE) and EVE;recurring units derived from perfluoromethylvinylether (MVE), in an amount of between 23 and 35% by moles, with respect to total recurring units derived from TFE, perfluoromethylvinylether (MVE) and EVE; and iodine and/or bromine atoms in the chain and/or in the end position of the perfluoroelastomer chain,wherein, after curing, the perfluoroelastomer exhibits a compression set of 38% or less at temperatures of 200° C. for 70 hours when determined on type 214 O-rings according to ASTM D395 and D1414 standards. 2. The perfluoroelastomer of claim 1, said perfluoroelastomer further comprising, in addition to recurring units derived from TFE, EVE and MVE, recurring units derived from one or more per(halo)fluoromonomer (PFM). 3. The perfluoroelastomer of claim 2, wherein said per(halo)fluoromonomer (PFM) is selected from the group consisting of: C3-C8 perfluoroolefins; bromo- and/or iodo C2-C8 (halo)fluoroolefins;per(halo)fluoroalkylvinylethers complying with general formula CF2═CFORf3 in which Rf3 is a C2-C6 per(halo)fluoroalkyl, optionally comprising iodine or bromine atoms;per(halo)fluoro-oxyalkylvinylethers complying with general formula CF2═CFOX01, in which X01 is a C1-C12 per(halo)fluorooxyalkyl having one or more ether groups, optionally comprising iodine or bromine atoms;per(halo)fluoro-methoxy-alkylvinylethers complying with general formula CF2═CFOCF2ORf4 in which Rf4 is a C1-C6 per(halo)fluoroalkyl, or a C1-C6 per(halo)fluorooxyalkyl having one or more ether groups, optionally comprising iodine or bromine atoms;per(halo)fluorodioxoles of formula: wherein each of Rf3, Rf4, Rf5, Rf6, equal to or different from each other, is independently a fluorine atom, a C1-C6 per(halo)fluoroalkyl group, optionally comprising one or more oxygen atom, and optionally comprising iodine or bromine atoms. 4. The perfluoroelastomer of claim 1, said perfluoroelastomer further comprising recurring units derived from a bis-olefin of general formula (I) here below: wherein:R1, R2, R3, R4, R5 and R6, which are identical 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 perfluoroelastomer of claim 1, wherein, after curing, the perfluoroelastomer exhibits a compression set of 36% to 48% at 316° C. for 70 hours when determined on type 214 O-rings according to ASTM D395 and D1414 standards. 6. The perfluoroelastomer of claim 1, wherein, after curing, the perfluoroelastomer exhibits a compression set of 18% to 22% at 200° C. for 70 hours when determined on type 214 O-rings according to ASTM D395 and D1414 standards. 7. A process for manufacturing the perfluoroelastomer according to claim 1. 8. Cured articles made from the perfluoroelastomer of claim 1. 9. A peroxide curable perfluoroelastomer consisting essentially of: recurring units derived from tetrafluoroethylene (TFE);recurring units derived from perfluoroethylvinylether (EVE), in an amount of between 2 and 17% by moles, with respect to total recurring units derived from TFE, perfluoromethylvinylether (MVE) and EVE;recurring units derived from perfluoromethylvinylether (MVE), in an amount of between 23 and 35% by moles, with respect to total recurring units derived from TFE, perfluoromethylvinylether (MVE) and EVE; iodine and/or bromine atoms in the chain and/or in the end position of the perfluoroelastomer chain; andoptionally recurring units derived from a bis-olefin of general formula (I): wherein:R1, R2, R3, R4, R5 and R6, which are identical or different from each other, are H or C1-C5 alkyl; andZ is a linear or branched C1-C18 alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical, and further comprising iodine and/or bromine atoms in end-groups,wherein, after curing, the perfluoroelastomer exhibits a compression set of 38% or less at temperatures of 200° C. for 70 hours when determined on type 214 O-rings according to ASTM D395 and D1414 standards. 10. The perfluoroelastomer of claim 9, said perfluoroelastomers consisting essentially of: optionally recurring units derived from a bis-olefin of general formula (I): wherein:R1, R2, R3, R4, R5 and R6, which are identical or different from each other, are H or C1-C5 alkyl; andZ is a linear or branched C1-C18 alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical, and further comprising iodine and/or bromine atoms in end-groups;from 60 to 75% moles of recurring units derived from TFE;from 2 to 17% moles of recurring units derived from EVE;from 23 to 35% moles of recurring units derived from MVE; andfurther comprising iodine and/or bromine in end-groups. 11. The perfluoroelastomer of claim 10, said perfluoroelastomers consisting essentially of: optionally recurring units derived from a bis-olefin of general formula (I): wherein:R1, R2, R3, R4, R5 and R6, which are identical or different from each other, are H or C1-C5 alkyl; andZ is a linear or branched C1-C18 alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical, and further comprising iodine and/or bromine atoms in end-groups;from 65 to 70% moles of recurring units derived from TFE;from 4 to 10% moles of recurring units derived from EVE;from 25 to 30% moles of recurring units derived from MVE; and further comprising iodine and/or bromine in end-groups. 12. A curable composition comprising the perfluoroelastomer according to claim 1, and further comprising at least one peroxide, said peroxide being present in an amount of 0.05 to 10% by weight relative to said perfluoroelastomer. 13. The curable composition of claim 12, wherein said peroxide is selected from the group consisting of di-tert-butyl peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, dicumyl peroxide, dibenzoyl peroxide, di-tert-butyl perbenzoate, and bis[1,3-dimethyl-3-(tert-butylperoxy)butyl] carbonate. 14. The curable composition of claim 12, said composition comprising one or more additional ingredients selected from the group consisting of: (a′) vulcanization coagents, in an amount generally of between 0.5% and 10% by weight relative to said perfluoroelastomer;(b′) a metallic compound, in an amount of between 1% and 15% by weight relative to the polymer, said metallic compound being selected from the group consisting of oxides and hydroxides of divalent metals, optionally combined with a salt of a weak acid;(c′) acid acceptors of metal non-oxide type;(d′) other conventional additives selected from the group consisting of thickening fillers, pigments, antioxidants, and stabilizers. 15. A process for manufacturing the cured articles, said process comprising: providing the curable perfluoroelastomer composition of claim 12;vulcanizing-moulding said composition to yield shaped pre-formed sealing articles; andoptionally, thermally post-treating said shaped pre-formed sealing articles to yield the cured articles. 16. Cured articles made from the curable composition of claim 12.
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이 특허에 인용된 특허 (11)
Brothers Paul Douglas ; Morgan Richard Alan, Amorphous fluoropolymer containing perfluoro(ethyl vinyl ether).
Giannetti Enzo (Novara ITX) Rotasperti Angelo (Galbiate ITX) Marchese Enrico (Asti ITX), Process for the polymerization in aqueous dispersion of fluorinated monomers.
Arcella Vincenzo (Novara ITX) Brinati Giulio (Milan ITX) Bonardelli Piergiorgio (Brescia ITX) Tommasi Giulio (Milan ITX), Process for the preparation of curable fluoroelastomers and products so obtained.
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