Improved processability of silica-filled rubber stocks

Details Improved processability of silica-filled rubber stocks Improved processability of silica-filled rubber stocks

C - Chemistry, Metallurgy

08

K

C08K 9/06 (2006.01) B60C 1/00 (2006.01) C08J 3/24 (2006.01) C08K 3/36 (2006.01) C08K 5/103 (2006.01) C08K 5/1535 (2006.01) C08K 5/5419 (2006.01) C08L 9/00 (2006.01)

Patent

CA 2243091

A processable rubber stock is produced by the preparation of a silica-filled, vulcanized elastomeric compound comprising mixing an elastomer with an amorphoussilica filler, from 0 to less than about 1% by weight based on said silica filler of bis[3-(triethoxysilyl)propyl]tetrasulfide, an alkylalkoxysilane and a cure agent. A further processing aid comprising at least one of an ester of a fatty acid or an ester of a polyol is preferred. The elastomer is preferably a diene monomer homopolymer or a copolymer of at least one diene and at least one monovinyl aromatic monomer. By effecting vulcanization, a vulcanized elastomeric compound is produced containing good physical properties for use as tread stock for a pneumatic tire.

On produit un caoutchouc traitable en préparant un composé élastomère, vulcanisé, chargé de silice. Cette préparation consiste à mélanger un élastomère avec : une matière de charge à base de silice amorphe; de 0 à moins de 1 %, par rapport au poids de cette matière de charge siliceuse, de tétrasulfure de bis¢3-(triéthoxysilyl)propyle!; un alkylalcoxysilane; et un agent de durcissement. On préfère utiliser une matière de traitement supplémentaire comprenant au moins un ester d'acide gras ou un ester de polyol. L'élastomère est de préférence un homopolymère de diène ou un copolymère d'au moins un diène et d'au moins un monomère aromatique monovinylique. En effectuant la vulcanisation, on produit un composés élastomère vulcanisé possédant de bonnes propriétés physiques et devant servir de semelle pour un pneumatique.

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