RUBBER COMPOSITION

• Main Authors: HAYATA DAISUKE, INOUE YOSHIHISA
• Format: Patent
• Language: English; Japanese
• Published: 03.12.2015
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

PROBLEM TO BE SOLVED: To provide a rubber composition which has practically sufficient breaking strength as a vulcanized product, shows good balance between good fuel saving properties and wet skid resistance and is also excellent in wear resistance.SOLUTION: A rubber composition contains 100 pts.mass of a conjugated diene polymer (a) and 20-150 pts.mass of silica (b), and at least a part of the conjugated diene polymer (a) is bound to silica (b) to form a bound rubber. The rubber composition has a Gs of 0.40 or greater, determined by expression (1): Gs=Gt×Fs. In expression (1), Gt is the mass of the bound rubber to the mass of silica (b), and Fs is the ratio of restriction ingredients contained in the bound rubber. 【課題】加硫物としたときに、実用上十分な破断強度を有し、かつ良好な省燃費性及びウェットスキッド抵抗性のバランスを示し、更に耐摩耗性にも優れるゴム組成物を提供することを目的とする。【解決手段】共役ジエン系重合体（ａ）１００質量部と、シリカ（ｂ）２０〜１５０質量部と、を含み、前記共役ジエン系重合体（ａ）の少なくとも一部が、前記シリカ（ｂ）と結合したバウンドラバーであり、下記式（１）で表されるＧｓが、０．４０以上である、ゴム組成物。Ｇｓ＝Ｇｔ?Ｆｓ （１）（式（１）において、Ｇｔ、Ｆｓはそれぞれ下記で表される。Ｇｔ：前記シリカ（ｂ）の質量に対する前記バウンドラバーの質量Ｆｓ：前記バウンドラバーに含まれる拘束成分の割合）【選択図】なし