To provide a side wall composed of a tire rubber composition having improved flex crack growth resistance and fuel economy while maintaining workability.SOLUTION: A tire rubber composition contains a polybutadiene rubber (i), another rubber (ii), and a rubber reinforcement material (iii), where the polybutadiene rubber (i) contains a polybutadiene (A) satisfying the conditions of the ratio between a 5 wt.% toluene solution viscosity and a Mooney viscosity (Tcp/ML) of 2.5 or more and a weight average molecular weight of 60.0×10or more, and a polybutadiene (B) satisfying the conditions of the ratio between a 5 wt.% toluene solution viscosity and a Mooney viscosity (Tcp/ML) of 3.5 or less and a weight average molecular weight of 56.0×10, with the polybutadiene (A)/the polybutadiene (B) of 10/90-80/20.SELECTED DRAWING: None

    【課題】加工性を保ちつつ、耐屈曲亀裂成長性および低燃費性が改良されたタイヤ用ゴム組成物から構成されるサイドウォールを提供する。【解決手段】本発明に係るタイヤ用ゴム組成物は、5重量%トルエン溶液粘度とムーニー粘度の比(Tcp/ML)が2.5以上、および重量平均分子量が60.0×104以上の条件を満たすポリブタジエン(A)と、5重量%トルエン溶液粘度とムーニー粘度の比(Tcp/ML)が3.5以下、および重量平均分子量が56.0×104以下の条件を満たすポリブタジエン(B)とを含み、前記ポリブタジエン(A)/前記ポリブタジエン(B)が、10/90〜80/20であるポリブタジエンゴム(i)と、その他のゴム(ii)と、ゴム補強材(iii)とを含む。【選択図】なし


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    Title :

    SIDE WALL AND PNEUMATIC TIRE


    Additional title:

    サイドウォールおよび空気入りタイヤ


    Contributors:

    Publication date :

    2019-12-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen / B60C VEHICLE TYRES , Fahrzeugreifen / C08K Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe , USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS



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