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.
Claims8
A transition metal complex of a ligand of the formula
- wherein:
- Y is oxo, NR12 or PR12
- Z is NR13, S or PR13;
- each of R1, R2 and R3 is independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
- n is 0 or 1;
- each R12 is independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
- each R13 is independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
- and provided that any two of R1, R2 and R3 geminal or vicinal to one another taken together may form a ring;
- wherein said complex has the formula (L1)x(L2)y(L3)zM (VIII), wherein L3 is (I);
- z is 1 or 2;
- M is a transition metal of oxidation state q;
- y is an integer of 1 to 3;
- x=(q−z);
- each L1 is independently a monodentate, monoanionic ligand, wherein at least one L1 group is a ligand that may add to an olefin;
- and L2 is a monodentate neutral ligand which may be displaced by an olefin, or an empty coordination site;
- or L1 and L2 taken together are a monoanionic, bidentate ligand into which an olefin molecule may insert between the ligand and M.
A transition metal complex of a ligand of the formula
- wherein:
- Y is oxo, NR12 or PR12
- Z is NR13, S or PR13;
- each of R1, R2 and R3 is independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
- n is 0 or 1;
- each R12 is independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
- each R13 is independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
- and provided that any two of R1, R2 and R3 geminal or vicinal to one another taken together may form a ring;
- wherein said complex has the formula
- wherein M is the transition metal;
- each L1 is independently a monodentate, monoanionic ligand, wherein at least one L1 group is a ligand that may add to an olefin;
- and L2 is a monodentate neutral ligand which may be displaced by an olefin, or an empty coordination site;
- or L1 and L2 taken together are a monoanionic, bidentate ligand into which an olefin molecule may insert between the ligand and M.
Dependencies are inferred from the claim text.