Phenylenediamine derivative, production method thereof and antioxidant for rubber using it as effective constituent

摘要

A phenylenediamine derivative represented by following formula (I) or (II): wherein R₁ and R₂ each represents a hydrogen atom, a lower alkyl group, or a lower alkoxy group; R₃ represents a hydrogen atom or a methyl group; R₄ represents a methyl group or an ethyl group; and n and m each is 1, 2, or 3; wherein R₁ and R₂ each represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, or a cyano group; and n and m each is 1, 2, or 3, is disclosed. These phenylenediamine derivatives are effectively used as antioxidants for rubbers, which scarcely cause vanishing by evaporation or a thermal denaturation even under a high-temperature condition of 150° C. or higher.