RUBBER COMPOSITION AND PNEUMATIC TIRE

摘要

PROBLEM TO BE SOLVED: To provide a rubber composition capable of improving fuel economy and abrasion resistance in a balanced state, and to provide a pneumatic tire produced by using the composition.SOLUTION: A rubber composition includes: a polymer mixture obtained by modifying a polymer of a conjugated diene compound and/or aromatic vinyl compound with a compound having an ester group and/or carboxyl group; and silica, wherein the weight-average molecular weight of the polymer mixture is from 1.0×10to 1.0×10.