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

Abstract

A phenylenediamine derivative represented by following formula (I) or (II): wherein R 1 and R 2 each represents a hydrogen atom, a lower alkyl group, or a lower alkoxy group; R 3 represents a hydrogen atom or a methyl group; R 4 represents a methyl group or an ethyl group; and n and m each is 1, 2, or 3; wherein R 1 and R 2 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.

1 - 9 . (canceled)  
     
     
         10 . An antioxidant for acrylic rubber comprising a mixture of 
 (A) an antioxidant compound having a relatively easily mobility in the rubber represented by the following formula:                          wherein R 1  represents a hydrogen atom or an alkyl group; R 2  represents an alkyl group or a cumyl group; and R 3  represents an alkyl group, and    (B) an antioxidant compound having an anti-extracting property and less volatility than the antioxidant of (A) represented by the following formula:                          wherein the antioxidant for acrylic rubber is resistant to thermal degradation under temperatures greater than 150° C.