Polymerization of olefins
AssigneeE. I. Du Pont de Nemours and Company
InventorsLin Wang, Lynda K. Johnson, Alex S. Ionkin
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Abstract
Olefins are polymerized by novel transition metal complexes of selected iminocarboxylate and iminoamido ligands, sometimes in the presence of cocatalysts such as alkylaluminum compounds or neutral Lewis acids. Olefins which may be (co)polymerized include ethylene, α-olefins, and olefins containing polar groups such as olefinic esters for example acrylate esters. Also described are certain “Zwitterionic” transition metal complexes as polymerization catalysts for making polar copolymers. The resulting polymers are useful as thermoplastics and elastomers.
Claims11
A process for the manufacture of a polar copolymer, wherein one or more hydrocarbon olefins, one or more polar olefins, and a polymerization catalyst system having a transition metal complex component containing a transition metal of groups 8-11 or a lanthanide metal, are contacted under polymerizing conditions to form said polar copolymer, wherein the transition metal complex component comprises a zwitterionic complex, which is an adduct of a neutral Lewis acid which is not covalently bound to a ligand of said transition metal complex component and a Lewis basic moiety of said ligand, wherein said ligand is a monoanionic bidentetate ligand and wherein said polar copolymer has an average degree of polymerization of 10 or more.
Dependencies are inferred from the claim text.