| 摘要 |
PURPOSE: A rubber composition for tire side walls having excellent tensile strength and extension as well as improved durability, anti-fatigue property and processing capability is provided. CONSTITUTION: The rubber composition for tire side walls comprises a base rubber consisting of 30 to 70 parts by weight of a natural rubber and 30 to 70 parts by weight of a butadiene rubber as raw materials, and 35 to 90 parts by weight of carbon black having heterogeneity index of 1.7 to 2.5 based on 100 parts by weight of the base rubber. The carbon black has CTAB specific surface area of 45 to 75 m2/g, IA adsorption of 90 mg/g, DBP oil absorption of 80 to 120 ml/100g, CDBP oil absorption of 60 to 100 ml/100g, STSA specific surface area of 40 to 75 m2/g, N2SA specific surface area of 50 to 80 m2/g, a mean diameter of primary particle determined by transmission electron microscopy of 30 to 40 nm, and a weight mean diameter of primary particle of 50 to 80 nm. |
