(per)fluoroelastomeric compositions

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 3/36 (2006.01) C08F 14/18 (2006.01)

Patent

CA 2656694

A (per)fluoroelastomeric composition curable by peroxidic way comprising: 100 phr as (per)fluoroelastomer; as filler, 0.5-50 phr of silica having a pH value, determined according to the DIN ISO 787-9 standard, higher than 7, preferably higher than 8; as crosslinking agent, from 0.5 to 10 phr of a bis-olefin having general formula (I) wherein: R1, R2, R3, R4, R5, R6, equal to or different from each other, are H or C1-C5 alkyls; Z is selected between a C1-C18 linear or branched alkylene or cycloalkylene radical, optionally containing oxygen atoms, preferably at least partially fluorinated, or a (per)fluoropolyoxyalkylene radical.

L'invention concerne une composition (per)fluoroélastomère durcissable au peroxyde qui comprend: 100 phr en tant que (per)fluoroélastomère; 0,5.50 phr de silice possédant une valeur de pH, définie en fonction de la norme DIN ISO 787-9, supérieur à 7, de préférence supérieur à 8, en tant que remplisseur; entre 0,5 et 10 phr d'une bis-oléfine représentée par la formule générale (I),en tant qu'agent de réticulation, dans laquelle: R1, R2, R3, R4, R5, R6, sont égaux ou différents entre eux, et représentent H ou des alkyles en C1-C5; Z est sélectionné parmi un radical alkylène ou cycloalkylène linéaire ou ramifié, contenant éventuellement des atomes d'oxygène, de préférence au moins partiellement fluorés, ou un radical (per)fluoropolyoxyalkylène.

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