Gas Phase Polymerization of α-Olefins with Ziegler — Natta and Metallocene Catalysts: a Comparison

During the four decades since the early discovery of K. Ziegler and G. Natta, polypropylene has grown to be one of the largest volume plastic materials with still an enormous growth rate of about 6–8% per year. This is the result of a lot of research and optimization work on catalysts and processes done by several companies and research institutes.