To provide a tread rubber composition that can produce a pneumatic tire whose vulcanization rate, wear resistance and ozone resistance are equal to those of the pneumatic tire using synthetic isoprene rubber and whose fuel economy is equal to or higher than that of it, while meeting the demand for a recycling-oriented society.SOLUTION: A tread rubber composition comprises a biomass-derived rubber that is obtained by polymerizing a monomer component containing biomass-derived isoprene and satisfies the following formulae (I): 0.5≤δD/δ13C≤3, 10≤δD/δ13C≤30 (I) (In the formulae (I), δD is a hydrogen isotope ratio and δ13C is a carbon isotope ratio).SELECTED DRAWING: None
【課題】 循環型社会の要求に応えながら、合成イソプレンゴムを用いた空気入りタイヤと同等の加硫速度、耐摩耗性、耐オゾン性、同等以上の低燃費性を有する空気入りタイヤを供することができるトレッド用ゴム組成物を提供する。【解決手段】 バイオマス由来のイソプレンを含むモノマー成分を重合して得られ、下記式(I)を満たすバイオマス由来ゴムを含むトレッド用ゴム組成物。0.5≦δD/δ13C≦3、10≦δD/δ13C≦30 (I)(式(I)中、δDは水素同位体比を表し、δ13Cは炭素同位体比を表す。)【選択図】なし
TREAD RUBBER COMPOSITION AND PNEUMATIC TIRE
トレッド用ゴム組成物、及び空気入りタイヤ
2021-05-20
Patent
Electronic Resource
Japanese