| abstract |
A sealant material composition according to the present invention comprises (A) a rubber component, (B) a tackifying agent, and (C) a plasticizing agent, wherein the softening point of the (B) tackifying agent is not lower than 50°C, the kinematic viscosity of the (C) plasticizing agent at 40°C is not more than 2,500 mm2/s, and the mass ratio (C)/(B) of the plasticizing agent (C) to the (B) tackifying agent is not less than 0.35. Thus, it is possible to improve the sealing properties, the temperature dependence of viscosity, and the fluidity during tire storage exhibited by the sealant material composition. |