To provide a method of producing a rubber composition for tires which has excellent fuel economy while maintaining or improving wear resistance, a rubber composition for tires, and a pneumatic tire.SOLUTION: There is provided a method of producing a rubber composition for tires containing: a rubber component containing 70-100 mass% of a hydrogenated copolymer which is obtained by hydrogenating an aromatic vinyl-conjugated diene copolymer and has a weight average molecular weight measured by gel permeation chromatography of 300,000 or more and a hydrogenation rate of a conjugated diene moiety of 80 mol% or more; silica; and a crosslinking compounding agent. The method of producing a rubber composition for tires comprises: a first step of mixing 50-95 mass% out of 100 mass% of the hydrogenated copolymer and the whole amount of the silica; a second step of mixing the remaining hydrogenated copolymer with the mixture obtained in the first step; and a third step of mixing the crosslinking compounding agent with the mixture obtained in the second step.SELECTED DRAWING: None
【課題】耐摩耗性を維持ないしは向上しつつ、低燃費性に優れたタイヤ用ゴム組成物の製造方法、タイヤ用ゴム組成物、及び空気入りタイヤを提供する。【解決手段】芳香族ビニル-共役ジエン共重合体が水素添加された水添共重合体であって、ゲル浸透クロマトグラフィーにより測定された重量平均分子量が30万以上であり、共役ジエン部の水素添加率が80モル%以上である水添共重合体を70~100質量%含むゴム成分と、シリカと、架橋系配合剤とを含有するタイヤ用ゴム組成物の製造方法であって、上記水添共重合体100質量%のうち50~95質量%と、シリカ全量とを混合する第1工程と、上記第1工程で得られた混合物に、残りの前記水添共重合体を混合する第2工程と、上記第2工程で得られた混合物に、架橋系配合剤を混合する第3工程とを有する、タイヤ用ゴム組成物の製造方法とする。【選択図】なし
METHOD OF PRODUCING RUBBER COMPOSITION FOR TIRES, RUBBER COMPOSITION FOR TIRES, AND PNEUMATIC TIRE
タイヤ用ゴム組成物の製造方法、タイヤ用ゴム組成物、及び空気入りタイヤ
2023-05-30
Patent
Electronic Resource
Japanese
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen / C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen / C08K Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe , USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS |
RUBBER COMPOSITION, RUBBER COMPOSITION FOR TIRES, AND PNEUMATIC TIRE
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