To provide a heavy-duty pneumatic tire excellent in wet traction performance and uneven wear resistance.SOLUTION: In an objective heavy-duty pneumatic tire, a cap tread rubber includes a diene rubber including the natural rubber and butadiene rubber, and a reinforcing filler. The ratio of butadiene rubber is in a range of 15 to 50 pts.mass in 100 pts.mass of the diene rubber. A compounding amount of the reinforcing filler is in the range of 40 to 70 pts.mass based on 100 pts.mass of the diene rubber, and the carbon black having a nitrogen adsorption specific surface area (N2SA) of 100 m2/g or more occupies 75 mass% or more in the reinforcing filler. Besides, the ratio of a storage modulus (E'cap) at 60°C of the cap tread rubber to that (E'BC) at 60°C of a belt cushion rubber satisfies 1.2≤(E'cap)/(E'BC)≤3.0.SELECTED DRAWING: Figure 1

    【課題】優れたウェットトラクション性および耐偏摩耗性を有する重荷重用空気入りタイヤを提供する。【解決手段】キャップトレッドゴムが、天然ゴムおよびブタジエンゴムを含有するジエン系ゴムと補強性充填剤とを含み、ジエン系ゴム100質量部中、ブタジエンゴムの割合が15〜50質量部であり、ジエン系ゴム100質量部に対し、補強性充填剤の配合量が40〜70質量部であり、補強性充填剤中、窒素吸着比表面積(N2SA)が100m2/g以上のカーボンブラックが75質量%以上を占め、かつキャップトレッドゴムの60℃における貯蔵弾性率(E’cap)と、ベルトクッションゴムの60℃における貯蔵弾性率(E’BC)との比が1.2≦(E’cap)/(E’BC)≦3.0を満たす。【選択図】図1


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    Title :

    HEAVY-DUTY PNEUMATIC TIRE


    Additional title:

    重荷重用空気入りタイヤ


    Contributors:

    Publication date :

    2021-03-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    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 / C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen



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