YTTRIUM-BASED ETHYLENE POLYMERIZATION CATALYSTS WITH BULKY AMIDINATE ANCILLARY LIGANDS

摘要

A cationic Group 3 or Lanthanide metal complex for coordination polymerization of olefins is disclosed. The precursor metal complex is stabilized by an anionic amidinate ancillary ligand. Upon reaction with an activator, the complex becomes an active olefin-polymerization catalyst. Some invention processes give narrow polymer polydispersities.