The effect of some new synthesized carbon black/rubber coupling agents without nitrosogroups have been investigated in comparison with one commercially available coupling agent N,N’-bis(2-methyl-2-nitropropyl)-1,6-diaminohexane (Sumifine(TM) 1162). Rubber compounds based on natural rubber and carbon black N-220 were used for these experiments. Tensile properties, impact resilience, and heat buildup of vulcanized rubber are improved with all coupling agents under investigation in comparison with the unmodified compound. Any positive effect of coupling agents appears also in tear resistance, dynamic flow, and permanent set. The correlation between the efficiency and chemical structure of coupling agents is discussed.