| 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 DEG C. or higher.
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