Elastomers having a reduced hysteresis via interaction of...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 9/00 (2006.01) C08C 19/44 (2006.01) C08F 2/38 (2006.01) C08F 4/48 (2006.01) C08F 36/04 (2006.01) C08K 3/36 (2006.01)

Patent

CA 2242783

The reduction of hysteresis in a silica-filled, vulcanized elastomeric compound is produced by mixing diene monomer and optionally monovinyl aromatic monomer with an initiator and a coordinator; effecting polymerization conditions; terminatingpolymerization with a terminator containing an organo-tin group to form a tin-coupled diene elastomer; compounding the tin-coupled diene elastomer with an amorphous silica filler and a vulcanization agent; and, effecting vulcanization. A pneumatic tire tread stock incorporating the vulcanized elastomer compound exhibits decreased rollingresistance in the tire.

La réduction de l'hystérèse d'un composé élastomère, vulcanisé, chargé de silice, est obtenue : en mélangeant un monomère diénique et, facultativement, un monomère aromatique monovinylique avec un initiateur et un coordinateur; en créant des conditions de polymérisation; en terminant la polymérisation à l'aide d'un groupement organostannique afin de former un élastomère diénique couplé à de l'étain; en mélangeant cet élastomère diénique couplé à de l'étain avec une matière de charge à base de silice amorphe et un agent de vulcanisation; et en réalisant cette vulcanisation. Une semelle de pneu contenant ce composé élastomère vulcanisé permet d'obtenir des pneus possédant une résistance au roulement réduite.

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