Rubber composition and pneumatic tire
A rubber composition is provided that attains both low heat generating property and high reinforcement property simultaneously at high levels, is capable of attaining low fuel consumption through the tire, is excellent in durability, and is good in workability and surface property. The rubber composition contains 100 parts by weight of a diene rubber component, from 0.5 to 50 parts by weight of bagasse charcoal having a BET specific surface area of from 10 to 300 m 2 /g, and at least one of carbon black and silica. The total amount of the bagasse charcoal, the carbon black and the silica is preferably from 30 to 100 parts by weight per 100 parts by weight of the diene rubber component.
1. A rubber composition comprising 100 parts by weight of a diene rubber component, from 0.5 to 50 parts by weight of bagasse charcoal having a BET specific surface area of from 10 to 300 m 2 /g, and at least one of carbon black and silica, the bagasse charcoal being in the form of porous particles produced by carbonizing bagasse under heating in a pyrolysis furnace shielded from outside air.
2. The rubber composition as claimed in claim 1 , wherein a total amount of the bagasse charcoal, and the at least one of the carbon black and the silica is from 30 to 100 parts by weight per 100 parts by weight of the diene rubber component.
3. The rubber composition as claimed in claim 2 , wherein the rubber composition contains both carbon black and silica, and contains a silane coupling agent in an amount of from 2 to 25% by weight based on the amount of the silica.
4. The rubber composition as claimed in claim 1 , wherein the bagasse charcoal has a BET specific surface area of from 20 to 280 m 2 /g.
5. The rubber composition as claimed in claim 1 , wherein the bagasse charcoal has a BET specific surface area of from 25 to 250 m 2 /g.
6. The rubber composition as claimed in claim 1 , wherein the bagasse charcoal has an average particle diameter of from 0.1 to 500 μm.
7. A pneumatic tire comprising the rubber composition as claimed in claim 1 or 2 as at least a part of the pneumatic tire.
8. A pneumatic tire comprising the rubber composition as claimed in any one of claim 4 or 5 or 6 or 3 as at least a part of the pneumatic tire.