Rubber composition for base tread, and pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorToshikazu KONDO
Life of this patent
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Abstract
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.
Claims5
A pneumatic tire, comprising
- a base tread comprising a rubber composition for a base tread, the rubber composition comprising:
- a rubber component and
- a reinforcing agent,
- the rubber component comprising 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.
Dependencies are inferred from the claim text.