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It performs excellently on the protection of oxidation of rubber which is caused by thermal oxidative aging and catalytic oxidation by metal ions. Rubber antioxidant is mainly used for natural rubber and chloroprene rubber etc. It has excellent effects to the ageing caused by heating and oxygen and has stronger restrained effect to the metallic catalysis and oxidation, it is Suitable for naturat, buna-s, buna-N and chloroprene rubbers. Rubber antioxidant RD has a longer-time remaining of protective effect, because it has a higher molecular weight and has little diffusive loss. So it is suitable for the rubber products used in tropical area. Antioxidant RD production process is not complicated, polymerized only by ordinary materials, but the product contains components of different degree of polymerization of the polymer content of polymer, the proportion of affected Investigated on the Rubber Antioxidant 2,2,4-Trimethyl-1,2-dihydroquinoline Polymer