Tire with tread of elastomer composition

摘要

Pneumatic rubber tire with a tread composed of a rubber blend of a base of at least two synthetic elastomers composed of (i) specialized isoprene/butadiene copolymer elastomer having a low Tg in a range of -70 to -100 DEG C and (ii) a diene based elastomer having a Tg in a range of -5 to -30 DEG C together with a minor amount of natural cis 1,4-polyisoprene rubber. Selection of the base of the said two synthetic elastomers having spaced apart, or spatially defined, Tg's of at least 40 DEG C is an important feature of the tread rubber blend. Representative examples of contemplated elastomers with Tg's in a range of -5 to -30 DEG C are 3,4-polyisoprene elastomer, styrene/isoprene copolymer elastomer and high vinyl polybutadiene elastomers. In one aspect, the tread rubber blend is reinforced with reinforcing filler composed of carbon black or a combination of carbon black and silica accompanied by a coupling agent.