To provide a rubber composition for tires, which can obtain a vulcanization rate equivalent with a case where a thiuram vulcanization accelerator is used and can improve wet grip performance while maintaining breaking strength and wear resistance.SOLUTION: A rubber composition for tires is a hydrogenated copolymer obtained by hydrogenating an aromatic vinyl-conjugate diene copolymer, characterized by that a weight average molecular weight measured by gel permeation chromatography is 300,000 or larger, and a rubber component containing 80 mol% or larger of a hydrogenated copolymer having a hydrogenation rate of the conjugate diene part, a guanidine-based vulcanization accelerator and dithiocarbamate-based vulcanization accelerator are contained at a rate of 0.5 to 4.0 by a mass ratio (guanidine-based vulcanization accelerator/dithiocarbamate-based vulcanization accelerator).SELECTED DRAWING: None
【課題】チウラム系加硫促進剤を用いた場合と比較し、同等の加硫速度が得られ、破断強度、及び耐摩耗性を維持しつつ、ウエットグリップ性能を向上させることができる、タイヤ用ゴム組成物を提供する。【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含むゴム成分と、グアニジン系加硫促進剤とジチオカルバミン酸塩系加硫促進剤とを、質量比(グアニジン系加硫促進剤/ジチオカルバミン酸塩系加硫促進剤)で0.5〜4.0の割合で含有することを特徴とする、タイヤ用ゴム組成物とする。【選択図】なし
RUBBER COMPOSITION FOR TIRE, AND PNEUMATIC TIRE THEREWITH
タイヤ用ゴム組成物、及びそれを用いた空気入りタイヤ
2020-07-09
Patent
Elektronische Ressource
Japanisch
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 |
TIRE RUBBER COMPOSITION, AND PNEUMATIC TIRE PREPARED THEREWITH
Europäisches Patentamt | 2019
|RUBBER COMPOSITION FOR TIRE, AND PNEUMATIC TIRE THEREWITH
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|TIRE RUBBER COMPOSITION, AND PNEUMATIC TIRE PREPARED THEREWITH
Europäisches Patentamt | 2019
|TIRE RUBBER COMPOSITION, AND PNEUMATIC TIRE PREPARED THEREWITH
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