Patent ID: 7405256

Claim:
A rubber composition containing 10 to 100 parts by weight of carbon black with a nitrogen adsorption specific area of 30 to 100 m 2 /g and a dibutyl phthalate oil absorption amount of 50 ml/100 g or more, 2 parts by weight or more of sulfur or a sulfur compound and 5 to 120 parts by weight of lamellar natural ore based on 100 parts by weight of a rubber component containing 10 to 50% by weight of a conjugated diolefin polymer or a copolymer of a diolefin and an aromatic vinyl compound, having a primary amino group and an alkoxysilyl group and having a glass transition point of −30° C. or less; wherein a bifunctional or more monomer is copolymerized in a polymer chain and/or at least a portion of a (co)polymer chain is coupled with a bifunctional or more coupling agent.