Producing polyolefin products
AssigneeUnivation Technologies, LLC
InventorsFrancis C. Rix, Alexander D. Todd, C. Jeff Harlan
Life of this patent
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Abstract
Catalyst systems and methods for making and using the same. A method of methylating a catalyst composition while substantially normalizing the entiomeric distribution is provided. The method includes slurrying the organometallic compound in dimethoxyethane (DME), and adding a solution of RMgBr in DME, wherein R is a methyl group or a benzyl group, and wherein the RMgBr is greater than about 2.3 equivalents relative to the organometallic compound. After the addition of the RMgBr, the slurry is mixed for at least about four hours. An alkylated organometallic is isolated, wherein the methylated species has a meso/rac ratio that is between about 0.9 and about 1.2.
Claims5
A method of forming a pre-catalyst composition, comprising:
- dissolving 1-ethylindenyllithium in dimethoxyethane to form a precursor solution;
- cooling the precursor solution to about −20° C.;
- adding solid ZrCl4 over about five minutes to start a reaction;
- continuing the reaction overnight;
- removing volatiles to form a raw product;
- extracting the raw product with CH2Cl2;
- and
- removing the CH2Cl2 under vacuum to form a mixture comprising about 19 parts meso-(1-EtInd)2ZrCl2 and about 1 part rac-(1-EtInd)2ZrCl2.
Dependencies are inferred from the claim text.