Amine-initiated elastomers having a hysteresis reducing...

C - Chemistry – Metallurgy – 08 – L

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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 2242800

The reduction of hysteresis in a silica-filled, vulcanized elastomeric compound is produced by mixing diene monomer and optionally monovinyl aromatic monomer with a lithium amine initiator and, optionally, a modifier; effecting polymerization conditions; terminating polymerization with an amino group producing terminator to form an amine functionalized diene elastomer; compounding the amine functionalized 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 rolling resistance 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 à base d'amine lithinifère et, facultativement, un modificateur; en créant des conditions pour la polymérisation; en terminant la polymérisation à l'aide d'un groupement amino produisant une terminaison, afin de former un élastomère diénique possédant des groupements fonctionnels amines; en mélangeant cet élastomère diénique possédant des groupements fonctionnels amines 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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