New ligands, compositions, metal-ligand complexes and arrays with
pyridyl-amine ligands are disclosed that catalyze the polymerization of
monomers into polymers. Certain of these catalysts with hafnium metal
centers have high performance characteristics, including higher comonomer
incorporation into ethylene/olefin copolymers, where such olefins are for
example, 1-octene, isobutylene or styrene. Certain of the catalysts are
particularly effective at polymerizing propylene to high molecular weight
isotactic polypropylene in a solution process at a variety of
polymerization conditions.
