Octahedral Group IV Bis(phenolate) Catalysts for 1‑Hexene
Homopolymerization and Ethylene/1-Hexene Copolymerization
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Abstract
Octahedral group IV bis(phenolate)
catalysts are highly active
catalysts for the isospecific polymerization of 1-hexene and the copolymerization
of ethylene with 1-hexene. These catalysts are active for the production
of high molecular weight copolymers even at 130 °C. The copolymerization
parameters for these complexes were determined; all of the bis(phenolate)
complexes tested incorporate 1-hexene with high efficiency to give
random copolymers. The complexes prepared from the more sterically
demanding ligands showed higher molecular weights but similar comonomer
incorporations to those prepared from the less sterically demanding
ligands