PROBLEM TO BE SOLVED: To provide a rubber composition that improves tear resistance while maintaining hardness and low heat-generating properties.SOLUTION: A tire sidewall rubber member is made of a rubber composition comprising: a diene-based rubber; a reinforcing filler including at least 75 mass% of carbon black; a processing aid; and a compound represented by formula (I). The processing aid is at least one selected from among fatty acid metal salts, fatty acid amides and fatty acid esters, and the difference (Tm3-Tm1) between a start point (Tm1) and an end point (Tm3) of an endothermic peak of the processing aid as measured by a differential scanning calorimeter is at least 50°C. (Rand Rare each H, an alkyl group, an alkenyl group or an alkynyl group; and Mis Na, Kor Li.)SELECTED DRAWING: None
【課題】低発熱性と硬度を維持しつつ耐引き裂き性を向上するゴム部材の提供。【解決手段】ジエン系ゴムと、カーボンブラックを75質量%以上含む補強性充填剤と、加工助剤と、式(I)で表される化合物と、を含むゴム組成物からなり、加工助剤としては、脂肪酸金属塩、脂肪酸アミド及び脂肪酸エステルから選択される一種以上からなり、示差走査熱量計で測定された吸熱ピークの開始点(Tm1)と終了点(Tm3)の差(Tm3−Tm1)が50℃以上であるものを用いるタイヤサイドウォールゴム部材。(R1及びR2はH、アルキル基、アルケニル基又はアルキニル基;M+はNa+,K+又はLi+)【選択図】なし
TIRE SIDEWALL RUBBER MEMBER AND PNEUMATIC TIRE
タイヤサイドウォールゴム部材及び空気入りタイヤ
2018-04-19
Patent
Electronic Resource
Japanese
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 |
RUBBER COMPOSITION FOR TIRE MEMBER, CAP TREAD AND SIDEWALL, AND PNEUMATIC TIRE
European Patent Office | 2021
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