To provide a rubber composition for cap tread of a heavy load tire excellent in wet grip performance while maintaining high mileage performance and fracture strength, cap tread of a heavy load tire manufactured using the rubber composition, and a heavy load tire equipped with the cap tread.SOLUTION: A cap rubber composition for tread of a heavy load tire includes 50 pts.mass or more of carbon black and 5 to 30 pts.mass of C5C9 petroleum resin, based on 100 pts.mass of a rubber constituent including at least one kind selected from a group composed of isoprene rubber, butadiene rubber, and styrene-butadiene rubber. The C5C9 petroleum resin is a resin obtained by copolymerizing C5 fraction and C9 fraction, with a copolymerization ratio of the C9 fraction being 70% or more.SELECTED DRAWING: None

    【課題】低燃費性および耐破壊強度を維持しながら、ウェットグリップ性能に優れた重荷重用タイヤのキャップトレッド用ゴム組成物、該ゴム組成物を用いて作製された重荷重用タイヤのキャップトレッド、および該キャップトレッドを備えた重荷重用タイヤを提供すること。【解決手段】イソプレン系ゴム、ブタジエンゴムおよびスチレンブタジエンゴムからなる群から選ばれる少なくとも1種を含むゴム成分100質量部に対して、カーボンブラック50質量部以上、および、C5C9系石油樹脂5〜30質量部を含み、前記C5C9系石油樹脂がC5留分およびC9留分を共重合させたものであって、C9留分の共重合比が70%以上の樹脂である重荷重用タイヤのキャップトレッド用ゴム組成物。【選択図】なし


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    Title :

    CAP RUBBER COMPOSITION FOR TREAD OF HEAVY LOAD TIRE, CAP TREAD OF HEAVY LOAD TIRE, AND HEAVY LOAD TIRE


    Additional title:

    重荷重用タイヤのキャップトレッド用ゴム組成物、重荷重用タイヤのキャップトレッドおよび重荷重用タイヤ


    Contributors:

    Publication date :

    2021-08-02


    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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