Chain-coupled polymeric alkoxide compounds having controlled...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 8/42 (2006.01) C08C 19/44 (2006.01) C08F 8/12 (2006.01) C08G 81/02 (2006.01)

Patent

CA 2407874

The invention provides chain-coupled polymeric alkoxide compounds for use as the elastomeric component in vulcanizable elastomeric compositions comprising silica, carbon black or mixtures thereof. In particular, the invention provides anionically polymerized polymers having polymer chain living ends that are functionalized with alkoxide groups and coupled together by a metal or nonmetal atom. The polymeric alkoxide compounds have an initial high viscosity for ease of handling prior to compounding, a stable viscosity during storage, and a decreased compound viscosity for better filler dispersion and improved mixing efficiency. The invention further provides a pneumatic tire having at least one component produced from the vulcanizable elastomeric composition of the invention.

Cette invention concerne des composés alkoxy polymères accouplés à une chaîne s'utilisant comme composante élastomère dans des compositions élastomères vulcanisables concernant de la silice, du noir de fumée, ou un mélange de ces deux substances. L'invention porte en particulier sur des polymères à polymérisation anionique dont les extrémités vivantes de chaîne polymère sont fonctionnalisées avec des groupes alkoxy et qui sont reliés les uns aux autres par un atome de métal ou de non métal. Les composés alkoxy polymères présentent une viscosité initiale élevée qui facilite leur manipulation avant compoundage, une viscosité stable pendant le stockage et une viscosité réduite garantissant une meilleure dispersion de la charge et plus grande efficacité au mélange. Cette invention concerne également un pneumatique dont une composante au moins est produite à partir de la compositions élastomère vulcanisable selon l'invention.

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