Rubber-type hydrogenated vinyl polybutadienes

C - Chemistry – Metallurgy – 08 – C

Patent

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Details

C08C 19/02 (2006.01) B60C 1/00 (2006.01) C08F 8/04 (2006.01)

Patent

CA 2524667

Disclosed are hydrogenated vinyl polybutadienes having a degree of hydrogenation ranging between 20 and 100 percent, Mooney viscosities ranging between 10 and 150 Mooney units (ML 1+4/100~C), glass transition temperatures (Tg) = -57 ~C, and melting enthalpies (.DELTA.H) = 30 J/g. The inventive hydrogenated vinyl polybutadienes are provided with a microstructure comprising a) 0 to 44 percent by weight of 1,2-vinyl butadiene units of formula (I); b) 20 to 64 percent by weight of 1,2-butylene units of formula (II); c) 0 to 60 percent by weight of 1,4-butenylene units of formula (III); and d) 0 to 60 percent by weight of 1,4-butylene units of formula (IV). Said hydrogenated vinyl polybutadienes are excellent for producing all types of molded rubber bodies, especially for producing technical rubber articles, tires, and tire components. The molded rubber bodies produced from the inventive hydrogenated vinyl polybutadienes show good resistance to aging and good elasticity at low temperatures.

Vinyle-polybutadiènes hydrogénés présentant des degrés d'hydrogénation de 20 à 100 %, des viscosités de Mooney de l'ordre de 10 à 150 unités Mooney (ML 1+4/100·C), des températures de transition vitreuse (T¿g?) de = -57 ·C, des enthalpies de fusion (?H) = 30 J/g et une microstructure avec (a) 0 à 44 % en poids d'unités 1,2-vinyle-butadiène de formule (I), (b) 20 à 64 % en poids d'unités 1,2-butylène de formule (II), (c) 0 à 60 % en poids d'unités 1,4-buténylène de formule (III) et (d) 0 à 60 % en poids d'unités 1,4-butylène de formule (IV). Lesdits vinyle-polybutadiènes hydrogénés conviennent parfaitement à la fabrication de corps moulés en caoutchouc de toute sorte, en particulier à la fabrication d'articles techniques en caoutchouc, ainsi que de pneus et de constituants de pneus. Les corps moulés en caoutchouc fabriqués à l'aide de vinyle-polybutadiènes hydrogénés selon la présente invention possèdent une bonne résistance au vieillissement et une bonne élasticité à basse température.

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