Tire having tread with an internal softer transition rubber layer containing short fiber reinforcement

摘要

The invention relates to a tire having a tread comprising a circumferential outer tread cap rubber layer (1) and a transition rubber layer (2) underlying the outer tread cap rubber layer (1); wherein the rubber composition of the transition rubber layer (2) comprises:
(A) a blend of natural rubber, cis 1,4-polybutadiene rubber and styrene/butadiene copolymer rubber;
(B) of from 0 phr up to 30 phr of a reinforcing filler comprising:
(1) a rubber reinforcing carbon black, or
(2) silica, or
(3) a combination of rubber reinforcing carbon black and silica; and
wherein the transition rubber layer (2) contains a dispersion of 0.25 to 10 phr of fibrillated fiber aramid pulp.