To provide a pneumatic tire capable of suppressing reduction of air pressure after tire breakage while suppressing mass increase of whole tire.SOLUTION: There is provided a natural rubber composition, which contains (A) a natural rubber, and (B) a natural rubber having long chain branch index (LCB Index) at 70°C according to the following formula (I) of 3.0 to 5.5 and long chain branch index (LCB Index) at 130°C of 2.0 to 4.0, and has a content of the (B) component based on total of the (A) component and the (B) component of 10 to 40 mass%. LCB Index=G'/G'(I).SELECTED DRAWING: None

    【課題】タイヤ全体の質量増加を抑制しつつ、タイヤ損傷後の空気圧の低下を抑制することが可能な空気入りタイヤを提供すること。【解決手段】(A)天然ゴム、及び(B)下記式(I)に基づき、70℃における長鎖分岐指数(LCB Index)が3.0以上5.5以下であり、かつ、130℃における長鎖分岐指数(LCB Index)が2.0以上4.0以下である天然ゴムを含有し、(A)成分と(B)成分との合計に対する(B)成分の含有量が10〜40質量%であることを特徴とする天然ゴム組成物。LCB Index=G’1/G’5・・・(I)【選択図】なし


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    Title :

    NATURAL RUBBER COMPOSITION, RUBBER COMPOSITION, AND TIRE


    Additional title:

    天然ゴム組成物、ゴム組成物、及びタイヤ


    Contributors:

    Publication date :

    2018-12-27


    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





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