Nickel Diimine Cyclophane Catalysts for High Temperature Gas Phase Olefin Polymerization

Late transition metal olefin polymerization catalysts have received much attention recently because they can produce polyolefins with interesting new branching topologies and have better tolerance to functional groups. The PdII and NiII alpha diimine complexes are such catalysts, however they respectively decompose rapidly at 50° C and 70° C degrees. The molecular weights (MW) of polyethylenes, formed by these catalysts also decrease precipitously as the temperature of polymerization is raised. These problems significantly hinder the commercialization of these catalysts because commercial gas phase olefin polymerizations are typically operated at 80-100° C. Technology: University of California, Irvine, researchers have developed cyclophane-based transition metal alpha diimine catalysts that shows significantly improved thermal stability and produces high MW polyethylenes with phenomenally high yields at temperature ranges suitable for industrial gas phase olefin polymerization.

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