| 简介 |
PROBLEM TO BE SOLVED : To provide a rubber composition for sidewalls which has improvement in mileage, driving stability, resistance against breakage, elongation at break, and processability in a well-balanced way, and can prevent the shortage of spew at the time of demolding tire and to provide a pneumatic tire using the same.
SOLUTION : The rubber composition for sidewalls includes 5-60 mass%, as a total content, of butadiene rubber synthesized using a butadiene rubber containing 1, 2-syndiotactic polybutadiene crystal and a rare earth catalyst, 7-60 mass% of terminal modification butadiene rubber, and 20-70 mass% of isoprene rubber, in 100 mass% of the rubber component. In the rubber composition, based on 100 pts.mass of the rubber component, the total content of carbon black having a nitrogen adsorption specific surface area of 25-120 m2/g and silica having a nitrogen adsorption specific surface area of 70-250 m2/g is 20-40 pts.mass, and the content of zinc oxide is 3.6-16 pts.mass.
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