Rubber composition comprising as coupling agent a...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/548 (2006.01) B60C 1/00 (2006.01) C08L 21/00 (2006.01)

Patent

CA 2425330

The invention concerns an elastomeric composition based on at least a diene elastomer, an inorganic filler as reinforcing filler, a polyorganosilane as coupling agent (inorganic filler/diene elastomer), bearing at least two functions designated X and Y , capable of being grafted on the elastomer by function X and on the inorganic filler by function Y. The invention is characterised in that said function Y is a hydroxysilyl function (.ident.Si-OH). Preferably, said organosilane is a hydroxysilane polysulphide, the diene elastomer is selected in the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers, and the reinforcing inorganic filler is a highly dispersible silicious or aluminous filler. The invention also concerns tyres or semi-finished products for tyres, in particular running treads for tyres comprising the inventive composition.

Composition élastomérique à base d'au moins un élastomère diénique, une charge inorganique à titre de charge renforçante, un organosilane polyfonctionnel à titre d'agent de couplage (charge inorganique/élastomère diénique), porteur d'au moins deux fonctions notées "X" et "Y", greffable d'une part sur l'élastomère au moyen de la fonction X et d'autre part sur la charge inorganique au moyen de la fonction Y, caractérisée en ce que ladite fonction Y est une fonction hydroxysilyle (.ident.Si-OH). De préférence, cet organosilane est un polysulfure d'hydroxysilane, l'élastomère diénique est choisi dans le groupe constitué par les polybutadiènes, le caoutchouc naturel, les polyisoprènes de synthèse, les copolymères de butadiène, les copolymères d'isoprène, et la charge inorganique renforçante est une charge siliceuse ou alumineuse du type hautement dispersible. Pneumatiques ou produits semi-finis pour pneumatiques, en particulier bandes de roulement de pneumatiques comportant une composition conforme à l'invention.

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