Patent ID: 6642331
Filing Date: 2003-11-04
Classification: C08F

Abstract:
Perfluoroelastomers, curable by peroxidic route, obtained by polymerizing the following monomers:a) tetrafluoroethylene (TFE); b) fluorovinylethers of general formula: CFX&boxH;CXOCF2ORâ€ƒâ€ƒ(I) â€ƒwherein R has the following meanings: C2-C6 linear or branched (per) fluoroalkyl, C5-C6 cyclic (per) fluoroalkyl, C2-C6 linear or branched (per) fluoro oxyalkyl, containing from one to three oxygen atoms, X&boxH;F, H; c) bis-olefins having general formula: RI1RI2C&boxH;CRI3â€”Zâ€”CRI4&boxH;CRI5RI6â€ƒâ€ƒ(IA) â€ƒwherein RI1, RI2, RI3, RI4, RI5, RI6, equal to or different from each other, are H or C1-C5 alkyl; Z is a C1-C18 linear or branched alkylene or C4-C18 cycloalkylene radical, optionally containing oxygen atoms, or a (per) fluoropolyoxyalkylene radical; d) optionally, one or more fluorinated olefinic comonomers selected from the following: C3-C8 perfluoroolefins; perfluoroalkylvinylethers (PAVE) CF2&boxH;CFOR2f, wherein R2f is a C1-C6 perfluoroalkyl; perfluoro-oxyalkylvinylethers CF2&boxH;CFOXa, wherein Xa is a C1-C12 alkyl, or a C1-C12 oxyalkyl, or a C1-C12 (per) fluorooxyalkyl having one or more ether groups; said perfluoroelastomers comprising iodine and/or bromine atoms in the chain and/or in end position, said iodine and/or bromine atoms deriving from â€œcure siteâ€  comonomers and/or from chain transfer agents used in polymerization.