To provide a rubber composition for tires enabling to reduce rolling resistance, while excellently maintaining the operation stability and durability, when used in tires.SOLUTION: To 100 pts.mass of the rubber component containing 50 mass% or larger of natural rubber and 10 mass% to 35 mass% of the end modified butadiene rubber, 35 pts.mass to 60 pts.mass of the carbon black having a CTAB absorption specific surface area smaller than 60 m2/gm and 3 pts.mass to 30 pts.mass of silica having the CTAB specific surface area of smaller than 180 m2/g are blended, and the hardness at 20°C is set to 60 to 65, the tensile stress (M100) at the 100% elongation at 100°C is set to 2.0 MPa to 4.0 MPa, and a product (TB×RB) of the tensile strength TB at 100°C and the breaking elongation EB [unit:%] at 100°C is set to 2000 or larger.SELECTED DRAWING: Figure 1

    【課題】タイヤに使用したときに、操縦安定性や耐久性を良好に維持しながら、転がり抵抗を低減することを可能にしたタイヤ用ゴム組成物を提供する。【解決手段】天然ゴム50質量%以上と末端変性ブタジエンゴム10質量%〜35質量%とを含むゴム成分100質量部に対して、CTAB吸着比表面積が60m2/g未満であるカーボンブラック35質量部〜60質量部と、CTAB吸着比表面積が180m2/g未満であるシリカ3質量部〜30質量部とを配合し、20℃における硬度を60〜65、100℃における100%伸長時の引張応力(M100)を2.0MPa〜4.0MPa、100℃における引張強さTB〔単位:MPa〕と100℃における破断伸びEB〔単位:%〕との積(TB×EB)を2000以上に設定する。【選択図】図1


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    Titel :

    RUBBER COMPOSITION FOR TIRES


    Weitere Titelangaben:

    タイヤ用ゴム組成物


    Beteiligte:
    OZAKI MASATO (Autor:in) / SHIMIZU KATSUNORI (Autor:in)

    Erscheinungsdatum :

    2021-11-25


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen / B60C VEHICLE TYRES , Fahrzeugreifen / C08J Verarbeitung , WORKING-UP / 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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