Silica-coated alumina activator-supports for metallocene catalyst compositions
US-9346896-B2 · May 24, 2016 · US
Producing polyolefin products
US11142598B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11142598-B2 |
| Application number | US-201916541767-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 15, 2019 |
| Priority date | Feb 11, 2014 |
| Publication date | Oct 12, 2021 |
| Grant date | Oct 12, 2021 |
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Abstract
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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.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of alkylating an organometallic compound while substantially normalizing stereochemical configuration, comprising: slurrying the organometallic compound in ether; adding a solution of RLi in ether, wherein R is a methyl group or a benzyl group, and wherein the RLi is greater than about 2.3 equivalents relative to the organometallic compound; mixing for at least about four hours to form an alkylated organometallic compound; and isolating the alkylated organometallic, wherein the alkylated species has a meso/rac ratio that is between about 0.9 and about 1.2.
Assignees
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Classifications
- C08F4/65925Primary
two cyclopentadienyl rings being mutually non-bridged · CPC title
- C08F210/16Primary
Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title
two cyclopentadienyl rings being mutually bridged · CPC title
with non-conjugated dienes, e.g. EPT rubbers · CPC title
in combination with an organoaluminium compound · CPC title
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- What does patent US11142598B2 cover?
- 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…
- Who is the assignee on this patent?
- Univation Tech Llc
- What technology area does this patent fall under?
- Primary CPC classification C08F4/65925. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 12 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).