| abstract |
A rubber composition for a bead apex that suppresses reversion and has excellent processability, handling stability, fuel efficiency, run flat durability, and flat spot riding comfort, and a run having a bead apex using the rubber composition. Provide flat tires, tires for multipurpose sports cars, and run flat tires for multipurpose sports cars. A butadiene rubber containing natural rubber and / or isoprene rubber 20 to 90% by weight and 1,2-syndiotactic polybutadiene crystals, a modified butadiene rubber, an emulsion polymerization styrene butadiene rubber and a solution polymerization modified styrene butadiene rubber. 5 to 30 parts by weight of phenol resin and / or modified phenol resin, 5 to 8 parts by weight of sulfur, with respect to 100 parts by weight of rubber component containing 10 to 80% by weight of at least one synthetic rubber selected from the group, And a rubber composition for bead apex containing 0.1 to 3 parts by weight of an alkylphenol-sulfur chloride condensate, and a tire using the rubber composition. [Selection figure] None |