PROBLEM TO BE SOLVED: To provide a rubber composition for bead filler for maintaining and enhancing mechanical properties while reducing heat generation property by blending carbon black having a specific colloidal property.SOLUTION: Carbon black having nitrogen adsorption specific surface area NSA of 90 m/g or less and compression DBP absorption amount (24M4) of 95 to 120 ml/100 g of 50 to 90 pts.mass and thermosetting resin of 5.0 to 20.0 pts.mass are blended with 100 pts.mass of a diene rubber containing a natural rubber of 50 mass% or more, a curing agent is blended at 5.0 to 20.0 mass% based on the blended amount of the thermosetting resin 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 is 0.65 or more and the NSA, (24M4) and Dst satisfy 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、機械的特性を維持・向上するようにしたビードフィラー用ゴム組成物を提供する。【解決手段】天然ゴムを50質量%以上含むジエン系ゴム100質量部に対し、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のカーボンブラックを50〜90質量部、熱硬化性樹脂を5.0〜20.0質量部を配合し、かつ硬化剤を前記熱硬化性樹脂の配合量に対して5.0〜20.0質量%配合すると共に、前記カーボンブラックの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を満たすようにする。【選択図】図2


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    Titel :

    RUBBER COMPOSITION FOR BEAD FILLER


    Weitere Titelangaben:

    ビードフィラー用ゴム組成物


    Beteiligte:
    WADA TOMOYUKI (Autor:in) / HIJIKATA KENSUKE (Autor:in)

    Erscheinungsdatum :

    2017-02-09


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    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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