ИСТИНА

The present disclosure relates to bis(aryl phenolate) Lewis base transition metal complexes, catalyst systems including bis(aryl phenolate) Lewis base transition metal complexes. The invention also relates to a process for the production of a propylene or ethylene-based polymer or copolymer, comprising: polymerizing propylene, ethylene, or ethylene and 1-octene by contacting the propylene, the ethylene, or the ethylene and 1-octene with a catalyst system, in one or more continuous stirred tank reactors or loop reactors, in series or in parallel, at a reactor pressure of 0.05 - 1.500 MPa and a reactor temperature of 30 - 230° to form the propylene- or ethylene-based polymer or copolymer.