Bidentate diazinylamido complexes as catalysts for olefin polymerization
AssigneeDow Global Technologies LLC
InventorBryan D. Stubbert
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Abstract
Catalyst systems comprising a metal-ligand complex according to formula (I): where: M is a metal chosen from zirconium or hafnium, the metal having a formal oxidation state of +2, +3, or +4; each X is a monodentate or bidentate ligand independently chosen from (C1-C40) hydrocarbyl, (C6-C20) aryl, (C6-C20) heteroaryl, or halogen; n is 2 or 3; R1, R2, R5a, R5b, and R6 are independently chosen from (C1-C40) hydrocarbyl, (C1-C40) heterohydrocarbyl, —Si(RC)3, —N(RN)2, —ORC, halogen, or hydrogen; optionally, R1 and R2 are covalently linked to form an aromatic ring; z1 and z2 are independently C(RZ) or N, wherein each RZ is —II or (C1-C30) hydrocarbyl; provided that at least one of z1 and z2 is N; and each RC and RN in formula (I) is independently a (C1-C30) hydrocarbyl.
Claims11
A catalyst system comprising a metal-ligand complex according to formula (I):
- where
- M is a metal chosen from zirconium or hafnium, the metal having a formal oxidation state of +2, +3, or +4;
- each X is a monodentate or bidentate ligand independently chosen from (C1-C40) hydrocarbyl, (C6-C20) aryl, (C6-C20) heteroaryl, or halogen;
- n is 2 or 3;
- R1, R2, R5a, R5b, and R6 are independently chosen from (C1-C40) hydrocarbyl, (C1-C40) heterohydrocarbyl, —Si(RC)3, —N(RN)2, —ORC, halogen, or hydrogen;
- optionally, R1 and R2 are covalently linked to form an aromatic ring;
- z1 and z2 are independently C(RZ) or N, wherein each RZ is —H or (C1-C30) hydrocarbyl;
- provided that at least one of z1 and z2 is N;
- and
- each RC and RN in formula (I) is independently a (C1-C30) hydrocarbyl.
Dependencies are inferred from the claim text.