The book describes the latest commercial polymerization catalysts for the synthesis of polyethylenes and polypropyleneThe book provides a detailed description of the multi-center nature of commercial Ziegler-Natta catalysts.The book devotes specialized chapters to the most important aspects of transition metal polymerization catalysts: the reactions leading to the formation of active centers, the chemistry and stereochemistry of elemental polymerization steps, reaction kinetics, and the polymerization mechanism. The book contains an introductory chapter for researchers who are entering the field of polymerization catalysis. It describes the basic principles of polymerization reactions with transition-metal catalysts and the types of commercially manufactured polyolefins and copolymers