Polymerization and Copolymerization Reactions of Light Alkenes with Postmetallocene Catalysts Containing Titanium Complexes with Bidentate Pinacol Ligands

Two Ti complexes with bidentate ligands derived from pinacol and perfluoropinacol and activated with a binary Al(C2H5)2Cl ‐ Mg(C4H9)2 cocatalyst are efficient catalysts for polymerization of lightest alkenes, ethylene and propylene, and for their copolymerization. They produce linear polyethylene of moderate molecular weight and essentially atactic amorphous polypropylene. Ethylene/propylene copolymers prepared with these catalysts are compositionally uniform resins with a very low crystallinity degree which can be used as synthetic EPM rubbers. Titanium complexes with bidentate ligands derived from pinacol and perfluoropinacol and activated with a binary Al(C2H5)2Cl ‐ Mg(C4H9)2 cocatalyst are efficient catalysts forpolymerization of ethylene, propylene, and for their copolymerization. The comparison of DSC melting curves for polyethylene (1) and ethylene/propylene copolymers containing 2 (2), 6 (3) and 16 (4) mol. % of propylene show that these copolymers are compositionally uniform and gave a very low crystallinity degree. Resins with a very low crystallinity degree which can be used as synthetic ethylene/propylene (EPM) rubbers.