PROBLEM TO BE SOLVED: To provide a rubber composition for bead insulation for maintaining and enhancing rubber hardness and processability while reducing heat generation property by blending carbon black having a specific colloidal property.SOLUTION: Carbon black of 80 pts.mass or more and an inorganic filler of 20 pts.mass are blended with 100 pts.mass of a diene rubber containing a natural rubber of 30 mass% or more, the total of the carbon black and the inorganic filler is 100 to 180 pts.mass, 10 mass% or more of the carbon black satisfy nitrogen adsorption specific surface area NSA of 90 m/g or less, compression DBP absorption amount (24M4) of 95 to 120 ml/100 g and a ratio of mode diameter Dst (nm) in a mass distribution curve of a Stokes diameter of an aggregate of the carbon black and half band width thereof ΔDst (nm), ΔDst/Dst of 0.65 or more and the NSA, (24M4) and Dst satisfying the following formula;(24M4)/Dst<0.0093×NSA-0.06.SELECTED DRAWING: Figure 2

    【課題】特定のコロイダル特性を有するカーボンブラックを配合して発熱性を低減しながらゴム硬度および加工性を維持・向上するようにしたビードインシュレーション用ゴム組成物を提供する。【解決手段】天然ゴムを30質量%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、無機充填剤を20質量部以上配合し、前記カーボンブラックおよび無機充填剤の合計が100〜180質量部であり、前記カーボンブラックのうち10質量%以上が、窒素吸着比表面積N2SAが90m2/g以下、圧縮DBP吸収量(24M4)が95〜120ml/100g、カーボンブラック凝集体のストークス径の質量分布曲線におけるモード径Dst(nm)およびその半値幅ΔDst(nm)の比ΔDst/Dstが0.65以上であり、前記N2SA、(24M4)およびDstが次式;(24M4)/Dst<0.0093×N2SA−0.06を満たすことを特徴とする。【選択図】図2


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    Title :

    RUBBER COMPOSITION FOR BEAD INSULATION


    Additional title:

    ビードインシュレーション用ゴム組成物


    Contributors:

    Publication date :

    2017-02-09


    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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