Method for synthesis of monocyclopentadienyl complexes of zirconium and hafnium
AssigneeUnivation Technologies, LLC
InventorC. Jeff Harlan
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Abstract
Catalyst systems and methods for making and using the same are disclosed. In an example, a method of synthesizing a monocyclopentadienyl compound is provided. The method includes melting a di-cyclopentadienyl compound including the following structure: (A). As used herein, M is hafnium or zirconium. Each R is independently an H, a hydrocarbyl group, a substituted hydrocarbyl group, a heteroatom group. Each X is a leaving group selected from a halogen or a heteroatom group. A reaction melt is formed by adding a metal salt including the following structure: (B). A monocyclopentadienyl compound is deposited from a vapor formed over the reaction melt, wherein the monocyclopentadienyl compound includes the following structure: (C).
Claims20
A method of synthesizing a catalyst compound, comprising:
- melting a dicyclopentadienyl compound comprising the following structure:
- wherein M is hafnium or zirconium;
- each R is independently an H, a hydrocarbyl group, a substituted hydrocarbyl group, a heteroatom group;
- and each X is a leaving group selected from a halogen or a heteroatom group;
- forming a reaction melt by adding a metal salt comprising the following structure:
- depositing a monocyclopentadienyl compound from a vapor formed over the reaction melt, wherein the monocyclopentadienyl compound comprises the following structure:
- and
- reacting the monocyclopentadienyl compound with another ligand precursor to form the catalyst compound.
A method of forming a polyethylene copolymer comprising reacting ethylene and a C4-C20 alpha-olefin with a polymerization catalyst, wherein the polymerization catalyst is formed by:
- synthesizing a monocyclopentadienyl compound comprising:
- melting a dicyclopentadienyl compound comprising the following structure:
- wherein M is hafnium or zirconium;
- each R is independently an H, a hydrocarbyl group, a substituted hydrocarbyl group, a heteroatom group;
- and each X is a leaving group selected from a halogen or a heteroatom group;
- adding a metal salt comprising the following structure:
- and
- depositing a monocyclopentadienyl compound from the vapor, wherein the compound comprises the following structure:
- reacting the monocyclopentadienyl compound with another ligand precursor to form a catalyst compound;
- and
- activating the catalyst compound to form the polymerization catalyst.
Dependencies are inferred from the claim text.