Embodiments of this disclosure include processes of polymerizing olefins, the process comprising contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presence of a catalyst system, the catalyst system comprising a Group IV metal-ligand complex and an ionic metallic activator complex, the ionic metallic activator complex comprising an anion and a countercation, the anion having a structure according to formula (I):formula (I) ##STR00001##

Embodiments of this disclosure include processes of polymerizing olefins, the process comprising contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presence of a catalyst system, the catalyst system comprising a Group IV metal-ligand complex and an ionic metallic activator complex, the ionic metallic activator complex comprising an anion and a countercation, the anion having a structure according to formula (I):formula (I) ##STR00001##

Embodiments of this disclosure include processes of polymerizing olefins, the process comprising contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presence of a catalyst system, the catalyst system comprising a Group IV metal-ligand complex and a metallic activator ionic complex, the metallic activator ionic complex comprising an anion and a countercation, the anion having a structure according to formula (I): ##STR00001##

Embodiments of this disclosure include processes of polymerizing olefins, the process comprising contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presence of a catalyst system, the catalyst system comprising a Group IV metal-ligand complex and a metallic activator ionic complex, the metallic activator ionic complex comprising an anion and a countercation, the anion having a structure according to formula (I): ##STR00001##

A copolymer contains, based on the total amount of structural units of the copolymer, 90-99 mol % of propylene structural units and 1-10 mol % of butene structural units. The xylene solubles content of the copolymer is less than or equal to 4 wt %, and preferably less than or equal to 3 wt %. The propylene-butene copolymer is substantially free of fraction having a molecular weight lower than 1000. The copolymer has a melt flow index of greater than or equal to 20 g/10 min as measured at 230° C. under a load of 2.16 kg. The propylene-butene copolymer has a high melt flow index and few xylene solubles, and does not contain a phthalate-type plasticizer, and can be used in fields such as food and medical and health services.

Embodiments of this disclosure include processes of polymerizing olefins, the process comprising contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presence of a catalyst system, the catalyst system comprising a Group IV metal-ligand complex and a metallic activator ionic complex, the metallic activator ionic complex comprising an anion and a countercation, the anion having a structure according to formula (I):

Embodiments of this disclosure include processes of polymerizing olefins, the process comprising contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presence of a catalyst system, the catalyst system comprising a Group IV metal-ligand complex and a metallic activator ionic complex, the metallic activator ionic complex comprising an anion and a countercation, the anion having a structure according to formula (I):

Embodiments of this disclosure include processes of polymerizing olefins, the process comprising contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presence of a catalyst system, the catalyst system comprising a Group IV metal-ligand complex and an ionic metallic activator complex, the ionic metallic activator complex comprising an anion and a countercation, the anion having a structure according to formula (I):formula (I)

##STR00001##

Embodiments of this disclosure include processes of polymerizing olefins, the process comprising contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presence of a catalyst system, the catalyst system comprising a Group IV metal-ligand complex and an ionic metallic activator complex, the ionic metallic activator complex comprising an anion and a countercation, the anion having a structure according to formula (I):formula (I)

##STR00001##

Aromatic complexes featuring metal-aryl bonds, active in propylene and other alpha olefin polymerizations are described herein. They are prepared by a single step reaction of readily available ligands Ar.sub.x-L-E with MXy, wherein: Ar=Aryl sigma bonded to L, L=Heteroaromatic or heteroaliphatic ring, with one or more heteroatoms, including fused derivatives, E=Heteroatom on L, available for coordination with the metal. M=Transition metal from groups 3-6, 8, and the lanthanide series of the periodic table of elements. X=Halogenide, y=integer. The ligands react with the TiCl.sub.4 present on MgCl.sub.2 supported polypropylene catalysts and impart substantial activity and other enhancements. They may be used as ethylene or propylene polymerization and copolymerization with higher alpha-olefins, activated with aluminum alkyls such as triethylaluminum.