Fluoroelastomers curable by peroxides, process for their production and use thereof

• Main Authors: KOLLAR, ALEXANDR NIKOLAEVICH, WOESTE, GOVERT, GREENBLAT, MARK PEYSAKHOVICH, DR, KRUEGER, RALF, VERETENNIKOV, NIKOLAY VLADIMIROVICH, FILCHAKOVA, T.A, SOKOLOV, SERGEY VASILYEVICH, DR
• Format: Patent
• Language: English; French; German
• Published: 21.05.1997
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

Die vorliegende Erfindung betrifft peroxidisch vernetzbare Fluorkautschuke aus polymerisierten Einheiten von Vinylidenfluorid, mindestens einem fluorierten Propen und/oder einem fluorierten Methyl-vinylether, mindestens einem Perfluor(polyoxa-alkyl-vinylether), gegebenenfalls Tetrafluorethylen und vernetzungsaktiven Reaktivstellen, ein Verfahren zu deren Herstellung, deren Verwendung. Peroxide-crosslinkable fluoro-rubbers (PXFR) contain (a) 65-82 mole% vinylidene fluoride (VDF) units; (b) 0-12 mole% tetrafluoroethylene (TFE) units; (c) 12-23 mole% fluorinated propene and/or fluorinated methyl-vinyl ether units; (d) 0.3-6 mole% perfluoro(polyoxa-alkyl-vinyl ether) units of formula CF2=CF-O-Rf (I); and (e) 0.1-1.0 mole% reactive crosslinking sites. In (I), Rf is -(CF2)m-(O-CF2)n-OCF3 (II) (m = 3 and n = 0 or m = 2 and n = 1-4) or -(CF2CF2-O)m-CnF2n+1 (III) (m = 1-4 and n = 1 or 2). Also claimed is a process for the production of PXFR by radical-initiated copolymerisation of the comonomers at 0-120 degrees C under pressure in solution, suspension or emulsion.