Rubber composition containing two silicas

摘要

The present invention relates to a rubber composition comprising (A) an elastomer containing olefinic unsaturation and (B) 35 to 110 phr of silica filler, wherein said silica filler is comprised of (i) 10 to 100 phr of a first silica having a pore size distribution maximum of the aggregates in the first silica ranging from greater than 55 to 400 nm as determined by mercury porosimetry and an average specific surface area ranging from 60 to 135 m<2>/g as determined by N2 adsorption; and (ii) 10 to 100 phr of a second silica having a pore size distribution maximum of the aggregates in the second silica ranging from 5 to 50 nm as determined by mercury porosimetry and an average specific surface area ranging from 140 to 250 m<2>/g as determined by N2 adsorption.