2005-325307 is referenced by 5 patents.
PROBLEM TO BE SOLVED: To provide a silica-containing rubber composition which has improved processing efficiency and a decreased histeresis loss without defecting the modulus and the tensile strength.SOLUTION: The rubber composition comprises 100 pts.wt. of a rubber consisting of at least one kind of rubber selected from natural and synthetic rubbers, 20-100 pts.wt. of silica, 5-20 pts.wt. of a silane coupling agent for the amount of silica and 1-20 pts.wt. of a resinous material mostly consisting of an ester linked product of aleuretic, jalaric and lacci jalarical acids.