PNEUMATIC WITH AN EXTERNAL CIRCULAR Treadmill ADAPTED FOR GROUND CONTACT

摘要

Pneumatic tire1 having a tread2 composed of (A) medium vinyl polybutadiene rubber, (B) low vinyl polybutadiene rubber and, optionally, (C) cis 1,4-polyisoprene rubber. In a preferential aspect the medium vinyl polybutadiene is required to be of a type prepared by polymerizing 1,3-butadiene with a small amount of divinylbenzene in a hydrocarbon solvent with an alkyl lithium catalyst and in the presence of a polar catalyst modifier.