RUBBER COMPOSITION CONTAINING SILICA HAVING THE FIRST AND THE SECOND AGGREGATES HAVING DIFFERENT PARTICLE SIZES FROM EACH OTHER

摘要

PROBLEM TO BE SOLVED: To provide a rubber composition that is useful as tires. SOLUTION: This rubber composition is characterized by including a precipitated silica including the first aggregate and the second aggregate. The first aggregate amounts to 10-90 wt.% based on the whole weight of the silica including the first and second aggregates, while the second aggregate amounts to 90-10 wt.%. The first aggregate substantially comprises particles of 5-15 nm diameter, while the second one has 17-30 nm particle sizes. The pore size distribution is in the single mode according to the mercury porosimetry.