| abstract |
A rubber composition which is obtained by kneading one or more substances selected from the group consisting of (A1), (B1), (C1) and (D1), a rubber component and a filler; and a method for improving the viscoelasticity characteristics of a vulcanized rubber, which comprises a first step wherein one or more substances selected from the group consisting of (A1), (B1), (C1) and (D1), a rubber component, a filler and a sulfur component are kneaded, and a second step wherein the kneaded material obtained in the preceding step is subjected to a heat treatment. (A1) compounds represented by formula (I) (B1) salts of the compounds represented by formula (I) (C1) solvates of the compounds represented by formula (I) (D1) solvates of the salts of the compounds represented by formula (I) |