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|1. (WO2017018386) RUBBER COMPOSITION|
|Applicants:||SUMITOMO RUBBER INDUSTRIES, LTD.
As a result of the present invention, a rubber composition, a pneumatic tire having an inner liner comprising said rubber composition, and a vulcanizing bladder can be provided, said rubber composition having excellent air permeation resistance, molding workability, and durability. This rubber composition: contains a rubber component and a terpene-based resin having a glass transition temperature of no more than 60°C; and has an air-blocking index of at least 110 as indicated by formula (1). The pneumatic tire has an inner liner comprising this rubber composition and the tire vulcanizing bladder comprises this rubber composition. Formula (1): (air-blocking index) = (amount of air transmission for rubber composition in comparative example 1) / (amount of air transmission for rubber composition) × 100