Rubber composition for tread and pneumatic tire

トレッド用ゴム組成物及び空気入りタイヤ

Abstract

【課題】加工性、低燃費性、ウェットグリップ性能及び耐摩耗性をバランス良く改善できるトレッド用ゴム組成物、及びこれを用いた空気入りタイヤを提供する。 【解決手段】ゴム成分とシリカ及び、下記式(I)で表される化合物を含有し、前記ゴム成分中に、共役ジエン単量体単位と、重合性炭素ー炭素二重結合を有するヒドロカルビル基に置換シリル基又は置換アミノ基,置換含窒素複素環基が結合した単量体単位とを有する共重合体の一端に、アルコキシシラン化合物を反応させて得られる共役ジエン系重合体を含有するトレッド用ゴム組成物。 (R 101 は、水素原子、アルキル、アルケニル、アリール、又は水酸基。R 102 及びR 103 は、水素原子、アルキル、アルケニル、アルキニル、又はアミノ基およびカルボニル基を含む基を表す。d 1 は、0〜8の整数を表す。) 【選択図】なし
PROBLEM TO BE SOLVED: To provide a rubber composition for a tread capable of improving workability, low fuel consumption properties, wet grip performance and abrasion resistance in a good balance, and to provide a pneumatic tire using the same.SOLUTION: A rubber composition for a tread contains a rubber component, silica and a compound represented by the formula (I), and the rubber component contains a conjugated diene polymer obtained by reacting an alkoxysilane compound with a part of a copolymer having a conjugated diene monomer unit, a monomer unit which a substituted silyl group or a substituted amino group, and a substituted nitrogen-containing heterocyclic group bind to a hydrocarbyl group having a polymerizable carbon-carbon double bond. In the formula (I), Rrepresents a hydrogen atom, an alkyl, an alkenyl, an aryl or a hydroxyl group, Rand Rrepresent a hydrogen atom, an alkyl, an alkenyl, an alkynyl, or amino group and carbonyl group, and drepresents an integer of 0 to 8.

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