✍ Scribed by Yukio Imanishi; Naofumi Naga
No coin nor oath required. For personal study only.
Discovery of effective homogeneous transition metal catalysts for ole®n polymerization must be one of the most dramatic technologies for polymer synthesis in the 1980s. Especially, development of group 4-metallocene catalysts not only improved the property of manufactured polyole®ns but also made us possible to synthesize new type polyole®ns. A large number of studies have also been made on structure and property of the resultant polyole®ns with the advance of catalyst technology. Over the past few years, trend in catalyst development has moved from modi®cation of group 4-metallocene catalysts to search for new generation catalysts, such as nonmetallocene catalysts and late transition-metal catalysts. Some of the new catalysts can proceed speci®c polymerizations, which are not achieved with existent ole®n polymerization catalysts. Although, there are some subjects for the manufacturing of new catalysts and polyole®ns, the technologies are progressing rapidly. In this review, we highlight not only the development of polymerization catalysts but also the polyole®ns obtained with the new catalysts in the last decade.
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