the specification relates to certain imido - oxamide - type compounds and derivatives thereof which are useful for preventing metal catalyzed oxidative degradation of polyolefins . the specification also relates to olefin homopolymer and copolymer compositions containing such compounds and derivatives thereof and to a method for enhancing the resistance of olefin homopolymers and copolymers against metal - catalyzed oxidative degradation by incorporating these compounds therein .