A large amount of literature exists highlighting the structure/activity relationships between metallocene catalysts and the polymers they produce. This is of great commercial importance, as in order to be useful for a given application the catalyst must meet a number of requirements with respect to how it behaves with monomer, co-monomers, catalyst activator supports such as mMAO, and chain terminating reagents such as hydrogen. For a metallocene, the simple modification of tethering the two cyclopentadienyl rings together can have profound effects on their polymerization behavior. Furthermore, the nature of the bridging atom(s) also influences the results.<br/>The following talk will highlight a series of <i>ansa-</i>metallocene structures featuring cycloalkyl-bridging groups and their use in ethylene polymerization. When used in combination with solid acid activators these catalysts show a variety of unique behaviors compared to analogous metallocene catalysts featuring more typical one-atom bridged units. Highlighted features of polymerization using these catalysts will include their ability to incorporate 1-hexene co-monomer, control of polymer molecular weight and molecular weight distribution and their propensity to produce long chain branching.

Benefits from the use of cycloalkyl-bridged metallocene catalysts in ethylene polymerization

253rd National Meeting (2017)

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