Trigonox® CN90 may be used for various polymerization reactions. It can be used in emulsion, solution and bulk polymerizations. In emulsion processes, Trigonox® CN90 may be activated by organic-soluble or water-soluble reducing agents, or by metal compounds to achieve polymerization at room temperature or lower. When no accelerators are used, effective polymerization can be obtained in the temperature range of 50-200°C. For example, styrene and methyl methacrylate can be polymerized in bulk in the temperature range of 60-100°C using Trigonox® CN90. Trigonox® CN90 may also be used for emulsion polymerization of various vinyl monomers. Trigonox® CN90 may be used in diesel to improve the cetane number.