| abstract |
PROBLEM TO BE SOLVED: To provide a rubber composition which provides a pneumatic tire having good wet road braking performance and low rolling resistance and low electric resistance, and a pneumatic tire using the same. SOLUTION: (A) (A) Natural rubber and / or isoprene synthetic rubber, and (B) Styrene which is a solution-polymerized styrene-butadiene copolymer rubber partially or wholly modified at least one end of a molecular chain. A rubber composition comprising a rubber component comprising butadiene copolymer rubber and (B) a reinforcing filler containing 20 to 80% by weight of silica, and a pneumatic tire using this rubber composition as a tread rubber is there. |