| 摘要 |
PURPOSE:To improve the durability of a tire, by employing a specified rubber raw polymer as a rubber composition for a side part of a large-sized tire. CONSTITUTION:The rubber raw polymer as a rubber composition for a side part of a large-sized tire comprises a blended rubber of a styrene-butadiene rubber prepared by the solution polymerization and one or more of dien rubbers provided that the relationship between the amounts of stryrene and vinyl in the styrene-butadiene rubber satisfies formula (1) with the composition value X=30- 45, and the styrene-butadiene rubber is 30% or more in the blended rubber. Thus the resistance to cutting and crack and the low heat generating property of the side part can be improved, and therefore the durability of the tire can significantly be improved. |
