Patent ID: 7799856

Claim:
A rubber composition characterized by comprising (A) a natural rubber and/or a diene base synthetic rubber, (B) an inorganic filler and (C) a compound having in the same molecule, at least one group A reacting with the rubber (A) described above and two or more groups B adsorbing on the inorganic filler (B) described above; wherein the reacting group A described above is a non-aromatic conjugated double bond group or a double bond group adjacent to a group selected from a carbonyl group, a carboxyl group, an oxycarbonyl group and an amide group; wherein the adsorbing group B described above is a carboxyl group; wherein the reacting group A described above is a group derived from an unsaturated carboxylic acid selected from maleic acid, fumaric acid, itaconic acid, acrylic acid, methacrylic acid and sorbic acid; and wherein the compound (C) described above is a compound represented by any of the following Formula (III): HOOC—CH═CH—COO—R 8 —CO—CH═CH—COOH (III) wherein R 8 is a group represented by —CH 2 CH(OH)CH 2 O— or a group represented by —(R 11 O—COR 12 —COO—) t R 11 O—; R 11 is an alkylene group having 2 to 18 carbon atoms, an alkenylene group having 2 to 18 carbon atoms, a divalent aromatic hydrocarbon group or —(R 13 O) u R 13 — (R 13 is an alkylene group having 2 to 4 carbon atoms, and u is a number of 1 to 30 showing an average addition mole number of an oxyalkylene group); R 12 is an alkylene group having 2 to 18 carbon atoms, an alkenylene group having 2 to 18 carbon atoms or a divalent aromatic hydrocarbon group; and t is a number of 1 to 30 in terms of an average value.