Vulcanized rubber composition and rubber vibration insulator

Abstract

A vulcanized rubber composition which is obtained by vulcanizing a modified ethylene-.alpha.-olefin-nonconjugated diene copolymer rubber composition defined below with sulfur or organic peroxides, said modified rubber composition comprising an ethylene-.alpha.-olefin-nonconjugated diene copolymer rubber modified with 0.01-0.15% by weight of an unsaturated carboxylic acid or a derivative thereof on the basis of the modified ethylene-.alpha.-olefin-nonconjugated diene copolymer rubber and at least one dinitroamine represented by the following formula (A): ##STR1## wherein X represents a divalent chain aliphatic, cyclic aliphatic or aromatic group which may contain a halogen or oxygen, R.sup.1 represents a hydrogen atom, a chain aliphatic group, a cyclic aliphatic group or an aromatic group with a proviso that when both X and R.sup.1 represent a chain aliphatic group, nitrogen atoms may further link to each other through R.sup.1, and R.sup.2 and R.sup.3 each represents a hydrogen atom or an alkyl group of 1-12 carbon atoms and R.sup.2 and R.sup.3 may link to each other to form a ring. The vulcanized rubber composition is excellent in fatigue resistance against repeatedly applied deformation.

Dependencies are inferred from the claim text.