| 摘要 |
This invention relates to a tire tread compound that is easily processable which can be used in manufacturing tires having outstanding treadwear, rolling resistance and traction characteristics. The tire tread compounds of this invention are a blend of tin-coupled isoprene-butadiene rubber, 3,4-polyisoprene rubber and natural rubber or synthetic polyisoprene. The tire tread compounds of this invention can be utilized in making tires having greatly improved rolling resistance without sacrificing processability, traction or treadwear characteristics. These improved properties may be due, in part, to better interaction and compatibility with carbon black and/or silica fillers. The isoprene-butadiene rubber in the blend can be asymmetrical tin-coupled to further improve the cold flow characteristics of the rubber blend. Asymmetrical tin coupling, in general, also leads to better processability and other beneficial properties. This invention more specifically discloses a tire tread rubber composition which is comprised of (1) about 20 phr to about 60 phr of tin-coupled isoprene-butadiene rubber, (2) about 20 phr to about 60 phr of a rubber selected from the group consisting of natural rubber and synthetic polyisoprene, (3) about 5 phr to about 40 phr of 3,4-polyisoprene rubber, (4) about 25 phr to about 50 phr of carbon black and (5) about 5 phr to about 30 phr of silica. |
