Polymerization catalysts based on transition metal complexes with ligands containing pyrrolyl ring
AssigneeOccidental Chemical Corporation
InventorsBradley P. Etherton, Sandor Nagy
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Abstract
Disclosed is an azametallocene polymerization catalyst having the general formula ##STR1## where L is a ligand, or mixture of ligands, each having 4 to 30 carbon atoms and containing at least two fused rings, one of which is a pyrrolyl ring, Cp is a ligand containing a cyclopentadienyl group, B is a Lewis acid, Y is a halogen, alkoxy from C.sub.1 to C.sub.20, siloxy from C.sub.1 to C.sub.20, or mixtures thereof, M is titanium, zirconium, or mixtures thereof, m is 1 to 4, and n is 0 to 2, p is 0 to 2, q is 0 to 1, and m+n+q=4. The catalyst is useful in polymerizing unsaturated olefinic monomers such as ethylene.
Claims22
A catalyst comprising a compound having the general formula ##STR11## where L is a ligand, or mixture of ligands, each having 4 to 30 carbon atoms and containing at least two fused rings, one of which is a pyrrolyl ring, Cp is a ligand containing a cyclopentadienyl group, where two L ligands or an L and a Cp ligand can be bonded to each other via a bridging group, B is a Lewis base, Y is selected from the group consisting of halogen, alkoxy from C.sub.1 to C.sub.20, siloxy from C.sub.1 to C.sub.20, N(R.sub.1).sub.2, and mixtures thereof, M is selected from the group consisting of titanium, zirconium, and mixtures thereof, R.sub.1 is alkyl from C.sub.1 to C.sub.20, m is 2 to 4, n is 0 or 1, p is 0 or 2, q is 0 or 1, m+n+q=4, and m+q=3 or 4.
A catalyst comprising a compound having the general formula
- [L].sub.m --M--[X].sub.4-m
- where L is a ligand containing an indolyl or carbazolyl group, M is selected from the group consisting of titanium, zirconium, and mixtures thereof, X is halogen, and m is 2, 3, or 4.
A catalyst comprising a compound having the general formula
- [L].sub.4 --M
- where L is carbazolyl or indolyl with a C.sub.1 to C.sub.4 alkyl in the 2 position, the 7 position, or both the 2 and 7 positions, and M is titanium or zirconium.
A catalyst comprising a compound having the general formula
- [L].sub.m --M--[X].sub.n
- where L is a ligand, or mixture of ligands, each having 4 to 30 carbon atoms and containing at least two fused rings, one of which is a pyrrolyl ring, where two L ligands can be bonded to each other via a bridging group, X is halogen, M is selected from the group consisting of titanium, zirconium, and mixtures thereof, m is 2 to 4, n is 0 to 2, and m+n is 4.
Dependencies are inferred from the claim text.