| abstract |
(57) Abstract: To provide a rubber composition which gives a vulcanized rubber having improved tensile strength and repulsive elasticity. SOLUTION: In a molecule selected from the group consisting of a solid unsaturated rubbery polymer to which an alkali metal and / or an alkaline earth metal is added, a cyclic amide, and a thio compound corresponding to the compound- C (= M) -N <bond (wherein A rubber composition comprising at least 10% by weight of a rubber-like polymer obtained by reacting a compound having M having an O atom or an S atom) in a rubber component. |