RUBBER COMPOSITION, AND PNEUMATIC TIRE

摘要

The present invention provides a rubber composition whereby it is possible to improve processability, low fuel consumption, rubber strength, resistance to corrosion, wet grip performance, and steering stability in a balanced manner. The present invention also provides a pneumatic tire using said rubber composition. The present invention pertains to a rubber composition containing 35 mass% of a styrene butadiene rubber per 100 mass% of a rubber component and comprising: a conjugated diene-based polymer obtained by reacting a compound containing nitrogen atoms and/or silicon atoms with the active terminal of a co-polymer obtained by polymerizing a monomer component containing a conjugated diene compound and a silicon-containing vinyl compound using a polymerization initiator represented by formula (I); and a silica having a nitrogen adsorption specific surface area between 40 and 400 m2/g. The content of the conjugated diene-based polymer is 1 to 90 mass% and the content of a polyisoprene-based rubber is 0 to 40 mass% in 100 mass% of the rubber component, and the content of the silica is 10 to 150 parts by mass relative to 100 parts by mass of the rubber component.