Rubber composition for tyre comprising a multifunctional...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 77/26 (2006.01) B60C 1/00 (2006.01) C08G 77/388 (2006.01) C08K 5/5425 (2006.01) C08K 5/544 (2006.01) C08L 21/00 (2006.01)

Patent

CA 2412360

The invention concerns a sulphur crosslinkable elastomer composition, for use in the manufacture of tyres, comprising at least: i) an isoprene elastomer, in particular natural rubber; ii) a reinforcing inorganic filler, in particular silica; and iii) as coupling agent (white filler/isoprene elastomer), a multifunctional polyorganosiloxane (POS) comprising, grafted on its silicone atoms, part at least of a hydroxyl or hydrolysable function, at least a group bearing at least an activated double ethylene bond. Said POS is in particular a POS with imide, acid or ester function, whereof the double ethylene bond is activated by at least an adjacent carbonyl group (>C=O). The invention also concerns a tyre or semi-finished product, in particular a running tread for tyre comprising said inventive composition.

Composition élastomérique réticulable au soufre, utilisable pour la fabrication de pneumatiques, comportant au moins: i) un élastomère isoprénique, notamment du caoutchouc naturel; ii) une charge inorganique renforçante, notamment de la silice; et iii), à titre d'agent de couplage (charge blanche/élastomère isoprénique), un polyorganosiloxane (POS) multifonctionnel comportant, greffés sur ses atomes de silicium, d'une part au moins une fonction hydroxyle ou hydrolysable, d'autre part au moins un groupe porteur d'au moins une double liaison éthylénique activée. Ce POS est notamment un POS à fonction imide, acide ou ester, dont la double liaison éthylénique est activée par au moins un groupe carbonyle (>C=O) adjacent. Pneumatique ou produit semi-fini, notamment bande de roulement, pour pneumatique comportant une composition de caoutchouc conforme à l'invention.

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