PROBLEM TO BE SOLVED: To overcome a problem of deteriorating strength of a tire by blending a large amount of a recycled rubber because it is contaminant in the tire, especially a concern that effects by blending the recycled rubber become large because a bead insulation rubber has small amount of the rubber amount among tires, where an insulation rubber is required to be high hardness and high viscosity of an unvulcanized rubber, on the other hand use of the recycled rubber is desired from the viewpoint of reducing environmental load.SOLUTION: The above mentioned problem is solved by a rubber composition for tire bead insulation containing 100 pts.mass of diene rubber containing natural rubber of 60 pts.mass of more, 80 pts.mass of carbon black and 40 pts.mass of an inorganic filler with the total of carbon black and inorganic filler of 120 to 180 pts.mass and recycled rubber with 60 to 160 mesh of 4 to 50 mass% based on the inorganic filler.SELECTED DRAWING: None

    【課題】インシュレーションゴムは、高硬度かつ未加硫のゴムが高粘度であることが求められている。一方、環境負荷低減の観点から、再生ゴムの活用が望まれている。しかし、再生ゴムはタイヤ中で異物であるため多量に配合するとタイヤの強度を悪化させる等の問題点があった。とくにビードインシュレーションゴムはタイヤの中でもゴム量が少量であるため、再生ゴムの配合による影響が大きくなる懸念がある。【解決手段】天然ゴムを60質量部以上含むジエン系ゴム100質量部に対し、カーボンブラックを80質量部以上および無機充填剤を40質量部以上含み、前記カーボンブラックおよび無機充填剤の合計が120〜180質量部であり、さらに、60〜160メッシュの再生ゴムを前記無機充填剤に対し、4〜50質量%配合してなるタイヤビードインシュレーション用ゴム組成物によって上記課題を解決した。【選択図】なし


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    Title :

    RUBBER COMPOSITION FOR TIRE BEAD INSULATION AND PNEUMATIC TIRE USING THE SAME


    Additional title:

    タイヤビードインシュレーション用ゴム組成物およびそれを用いた空気入りタイヤ


    Contributors:

    Publication date :

    2016-06-02


    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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