Vulcanizable rubber composition, tread with low rolling resistance for vehicle tires, tire and processes to manufacture a tire and to reduce tire rolling resistance.

摘要

"COMPOSITION OF VULCANIZABLE RUBBER, TIRES WITH LOW RESISTANCE TO BEARING FOR VEHICLE TIRES, TIRE AND PROCESSES TO MANUFACTURE A TIRE AND TO REDUCE THE RESISTANCE TO TIRE BEARING". A vulcanizable rubber composition is described, comprising: a) a polymer base in which reinforcement charges are homogeneously dispersed, including: a1) a first modified copolymer obtainable by polymerizing at least one diolefin conjugated to at least one vinyl aromatic hydrocarbon in the presence of an initiator comprising at least one organic metal group and subsequent modification by reaction of the intermediate copolymer thus obtained with a compound comprising functional groups capable of reacting with the organic metal groups of the copolymer and derivative of the initiator, said first copolymer having a glass transition temperature comprised between 0 ° and -80 ° C, and comprising a total amount of vinyl aromatic hydrocarbon composed of between 5 and 50% by weight for the total weight thereof; a2) a second copolymer obtainable by polymerizing at least one diolefin conjugated to at least one vinyl aromatic hydrocarbon, said second copolymer having a glass transition temperature composed between 0 ° and -80 ° C, and comprising a total amount of hydrocarbon aromatic vinyl compound between 5% and 50% by weight of its total weight; b) a first carbon black reinforcement charge in such an amount that the volume electrical resistivity of the vulcanization rubber composition does not exceed 10 ^ -6 ^ Ohmxcm; c) a second reinforcement charge based on silica in such an amount that the sum of said first and said second reinforcement loads is comprised between 50 and 100 parts by weight per 100 parts by weight of polymer base.