RUBBER COMPOSITION FOR TIRE AND PNEUMATIC TIRE

• Main Author: TAKEDA KEIJI
• Format: Patent
• Language: English; Japanese
• Published: 09.07.2020
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DEVICES OR ARRANGEMENTS RELATED TO TYRES; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; VEHICLE TYRES; VEHICLES IN GENERAL

To improve wet grip performance while suppressing deterioration of low heat generation performance and wear resistance.SOLUTION: A rubber composition for tires according to an embodiment is a hydrogenated copolymer obtained by hydrogenating an aromatic vinyl-conjugate diene copolymer, in which a weight average molecular weight is 300,000 or larger and 1 to 50 pts.mass of partially hydrogenated polystyrene resin is contained relative to 100 pts.mass of a rubber component containing a hydrogenated copolymer having a hydrogenation rate of the conjugate diene part of 80 mol% or larger. Furthermore, a pneumatic tire according to an embodiment is produced with the rubber composition for tires.SELECTED DRAWING: None 【課題】低発熱性能と耐摩耗性の悪化を抑えながらウェットグリップ性能を向上する。【解決手段】実施形態に係るタイヤ用ゴム組成物は、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、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１００質量部に対して、部分水添ポリスチレン樹脂１〜５０質量部を含むものである。また、実施形態に係る空気入りタイヤは、該タイヤ用ゴム組成物を用いて作製されたものである。【選択図】なし