5610115 Organic carrier supported metallocene catalyst for olefin polymerization

“Bound but Not Gagged”Immobilizing Single-Site α-Olefin Polymerization Catalysts

“…Polystyrene-bound cyclopentadienes have also been used to construct late transition metal polymerization catalysts . Supported pseudo- C 2 -symmetric metallocenes were synthesized when lithiated cross-linked polystyrene was reacted with Cl 2 Si(Ind) 2 or PhClSi(Ind) 2 to form the supported ancillary ligand, which could be converted into the corresponding metallocene . Alternatively, the lithiated polystyrene was reacted with 1,4-dibromobenzene before lithiation, reaction with MeClSi(Ind) 2 , and conversion to the zirconocene (Scheme ).…”

Heterogeneous Single-Site Catalysts for Olefin Polymerization

“…Reacting Cl 2 SiCp‘ (Cp = Cp 159 or Ind 160 ) with silica produces a tethered ansa ligand set from which a zirconocene complex can be synthesized and used in ethylene polymerization to form polyethylene particles with good bulk density (0.38−0.39 g/cm 3 ) and no adhesion of polymer to the reactor. A similar synthetic methodology is used to react the Li(TMEDA) salt of cross-linked polystyrene with Cl 2 Si(Ind) 2 or PhClSi(Ind) 2 …”