RUBBER COMPOSITION AND PNEUMATIC TIRE

摘要

PROBLEM TO BE SOLVED: To provide a rubber composition capable of achieving both low heat build-up performance and conductivity.SOLUTION: The rubber composition is obtained by dry-mixing: a wet master batch containing a first diene rubber and a carbon black A having a nitrogen adsorption specific surface area (NSA) of 50 m/g or less; a carbon black B having a nitrogen adsorption specific surface area (NSA) larger than that of the carbon black A; and a second diene rubber. The difference between the nitrogen adsorption specific surface area of the carbon black A and the nitrogen adsorption specific surface area of the carbon black B is 20-70 m/g, and the ratio of the carbon black A to the total carbon black in the rubber composition is 15-48 mass%.SELECTED DRAWING: None