Rubber compositions comprising vinyl-cis-polybutadiene

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 9/00 (2006.01) C08F 136/06 (2006.01) C08L 21/00 (2006.01)

Patent

CA 2591712

A silica-containing rubber composition for tires which comprises: a rubber ingredient comprising (a) 20-80 wt.% vinyl-cis polybutadiene rubber containing 1,2-polybutadiene having a melting point of 170~C or higher and at least one polymer having at least one unsaturated double bond per repeating unit and selected among polyisoprene, crystalline polybutadiene having a melting point of 150~C or lower, liquid polybutadiene, and derivatives of these; and (b) 80- 20 wt.% diene rubber other than the ingredient (a); and a rubber reinforcement (c) comprising 40% or more silica, the amount of the reinforcement (c) being 40-100 parts by weight per 100 parts by weight of the sum of the rubbers (a) and (b). In the composition, the 1,2-polybutadiene and the polymer are dispersed in the forms of short crystalline fibers and of particles, respectively, in the cis polybutadiene rubber, which is a matrix ingredient in the vinyl-cis polybutadiene rubber (a). The short crystalline fibers of the 1,2-polybutadiene are dispersed in the particles of the polymer.

L'invention concerne une composition de caoutchouc contenant de la silice, pour des pneumatiques laquelle comprend : un ingrédient caoutchouc comprenant (a) 20-80 % en poids de caoutchouc de vinyl-cis-polybutadiène contenant du 1,2-polybutadiène ayant un point de fusion supérieur ou égal à 170°C et au moins un polymère ayant une double liaison insaturée par motif répété et sélectionné parmi le polyisoprène, le polybutadiène cristallin ayant un point de fusion inférieur ou égal à 150°C, le polybutadiène liquide et des dérivés de ceux-ci ; et (b) 80-20 % en poids de caoutchouc diénique autre que l'ingrédient (a) ; et un agent renforçant le caoutchouc (c) comprenant 40 % ou plus de silice, la quantité de l'agent renforçant (c) étant de 40-100 parties en poids pour 100 parties en poids de la somme des caoutchoucs (a) et (b). Dans la composition, le 1,2-polybutadiène et le polymère sont dispersés sous les formes de courtes fibres cristallines et de particules, respectivement, dans le caoutchouc de cis-polybutadiène, lequel est un ingrédient matrice dans le caoutchouc de vinyl-cis-polybutadiène (a). Les courtes fibres cristallines du 1,2-polybutadiène sont dispersées dans les particules du polymère.

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