| abstract |
PROBLEM TO BE SOLVED: To provide a rubber composition having a high elastic modulus without impairing fatigue resistance used for a rubber member, particularly a bead filler, disposed in a bead portion of a tire. 10-40% by weight of cis-1,4-bonded polybutadiene rubber modified with 1,2-bonded polybutadiene and 90-60% by weight of diene rubber other than syndiotactic-1,2-bonded polybutadiene-modified cis-1,4-bonded polybutadiene rubber 3 to 20 parts by weight of silica, 0.5 to 3 parts by weight of resorcinol or resorcinol derivative are blended with respect to 100 parts by weight of the rubber component Furthermore, hexamethylenetetramine or melamine derivative is added to resorcinol or resorcinol compounding amount of 0.8 to A rubber composition for a bead filler of a tire which contains 2.0 times the weight and has a storage elastic modulus (E ') of 8 to 15 MPa at a temperature of 30 ° C. of a vulcanized product. |