A vulcanizable Rubber composition, a Tread of low Rolling Resistance tyres for vehiclesA procedure for making a Tyre for Vehicle Wheels, a vehicle Tire and Procedure to reduce the Rolling Resistance of tire

摘要

A vulcanizable rubber composition is described comprising: a) a polymer base in which reinforcing fillers are homogeneously dispersed including: a1) a first modified copolymer obtainable by polymerization of at least one conjugated diolefin with at least one vinyl aromatic hydrocarbon in the presence of an initiator comprising at least one organic metal group and subsequent modification by reacting the so obtained intermediate copolymer with a compound comprising functional groups capable of reacting with the organic metal groups of the copolymer and derived from the initiator, said first copolymer having a glass transition temperature comprised between 0 DEG and -80 DEG C, and comprising a total quantity of vinyl aromatic hydrocarbon comprised between 5% and 50% by weight to the total weight of the same; a2) a second copolymer obtainable by polymerization of at least one conjugated diolefin with at least one vinyl aromatic hydrocarbon, said second copolymer having a glass transition temperature comprised between 0 DEG and -80 DEG C, and comprising a total quantity of vinyl aromatic hydrocarbon comprised between 5% and 50% by weight to the total weight of the same; b) a first carbon black-based reinforcing filler in such a quantity that the volume electrical resistivity of the vulcanized rubber composition does not exceed 10-6 Ohmxcm; c) a second silica-based reinforcing filler in such a quantity that the sum of said first and said second reinforcing fillers is comprised between 50 and 100 parts by weight per 100 parts by weight of polymer base. IMAGE