Ziegler-natta catalysts doped with non-Group IV metal chlorides
AssigneeFina Technology, Inc.
InventorsLei Zhang, David Knoeppel
Life of this patent
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Abstract
A process may include contacting ethylene monomer with Ziegler-Natta catalyst to form polyethylene. The Ziegler-Natta catalyst may be formed by contacting an alkyl magnesium compound with an alcohol and a metal reagent to form a blend, and contacting the blend with a first agent to form a solution of reaction product “A”. The solution of reaction product “A” may be contacted with a second agent to form a solid reaction product “B”, and the solid reaction product “B” may be contacted with a third agent to form a solid reaction product “C”. The solid reaction product “C” may be contacted with a fourth agent to form a solid reaction product “D”, and the solid reaction product “D” may be contacted with a fifth agent to form a catalyst component.
Claims7
A polymerization process comprising:
- providing ethylene monomer;
- contacting the ethylene monomer with a Ziegler-Natta catalyst within a polymerization reactor under conditions sufficient to form polyethylene;
- and
- recovering polyethylene from the polymerization reactor, wherein a shear response and activity for the polyethylene is greater than a shear response and activity for an identically formed polyethylene absent the metal reagent in the Ziegler-Natta catalyst, and wherein the Ziegler-Natta catalyst is formed by a process comprising:
- contacting an alkyl magnesium compound with an alcohol and a metal reagent to form a blend of a magnesium dialkoxide compound and a metal;
- contacting the blend of the magnesium dialkoxide compound and the metal with a first agent to form a solution of reaction product “A”, the first agent comprising a halogenating/titanating agent;
- contacting the solution of reaction product “A” with a second agent to form a solid reaction product “B”, the second agent comprising a blend of a first metal halide and a metal alkoxide;
- contacting the solid reaction product “B” with a third agent to form a solid reaction product “C”, the third agent comprising a second metal halide;
- contacting the solid reaction product “C” with a fourth agent to form a solid reaction product “D”, the fourth agent comprising a third metal halide;
- and
- contacting the solid reaction product “D” with a fifth agent to form a catalyst component, the fifth agent comprising an organoaluminum compound;
- wherein the metal in the metal reagent is selected from Cr3+, Fe2+, Mn2+, and Ba2+.
Dependencies are inferred from the claim text.