MODIFIED ETHYLENE-.ALPHA.-OLEFIN-NON-CONJUGATED DIENE COPOLYMER RUBBER COMPOSITION

摘要

MODIFIED ETHYLENE-.alpha.-OLEFIN-NON-CONJUGATED DIENE COPOLYMER RUBBER COMPOSITION The present invention provides a modified ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber composition which comprises an ethylene-a-olefin-non-conjugated diene copolymer rubber modified with an unsaturated carboxylic acid or a derivative thereof and at least one dinitroamine represented by the following formula (A): (A) wherein X represents a divalent chain aliphatic, cyclic aliphatic or aromatic group which may contain a halogen or oxygen, R1 represents a hydrogen atom, a chain aliphatic group, a cyclic aliphatic group or an aromatic group with a proviso that when both X and R1 represent a chain aliphatic group, nitrogen atoms may further link to each other through R1, and R2 and R3 each represents a hydrogen atom or an alkyl group of 1 - 12 carbon atoms and R2 and R3 may link to each other to form a ring. This composition is excellent in fatigue resistance against repeatedly applied deformation.