Pneumatic tire having a base tread rubber composition and

文件类型：PDF文档
文件大小：153K
Provided are a rubber composition for a base tread capable of improving fuel efficiency, handling stability, and durability (flex crack growth resistance) in a balanced manner, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for a base tread, including : a rubber component and a reinforcing agent, the rubber component including natural rubber, a butadiene rubber (1) containing 1, 2-syndiotactic polybutadiene crystals, a butadiene rubber (2) synthesized in the presence of a rare earth catalyst, and a modified butadiene rubber (3) having a cis content of not more than 50% by mass.