Patent ID: 11168162

Abstract:
The present disclosure provides polymerization processes to produce polymeric materials, such as olefin terpolymers, using transition metal catalysts having bridged phenolate ligands. The polymerization process includes contacting a transition metal complex with a mixture olefin monomers that contain ethylene, propylene, and a cyclic diene to produce an olefin polymer and recovering the olefin polymer. The mixture of olefin monomers can include specified weight ratios for the various olefin monomers. The transition metal complex includes a bridged phenolate ligand bonded to a metal atom via covalent bonds by two oxygens, a coordinate covalent bond by a Group 15 atom, and a coordinate covalent bond by a Group 15 or 16 atom. The transition metal complex provides relatively high endocyclic alkene/vinyl selectivity to minimize hyperbranching during the production of olefin polymeric materials, such as EPDM and other terpolymers that are free or substantially free of gels.