RUBBER COMPOSITION, AND PNEUMATIC TIRE USING THE COMPOSITION

A rubber composition enhanced in thermal conductivity and promoted in heat dissipation effect composed of a total 100 parts by weight of at least one rubber and 10 to 100 parts by weight of carbon black derived from, as a starting material, acetylene and having a thermal conductivity of at least a 0.3 kcal/m·h·°C and a pneumatic tire using that rubber composition for at least a part of a sidewall and/or at least a part of the bead of the tire which contacts the tire wheel rim flange.