Univation Technologies, LLC

C Jeff Harlan

Francis Charles Rix

Ching-Tai Lue

Timothy Marlow Boller

Catherine Anne Faler

Daniel Paul Zilker, Jr

Wesley R Mariott

Fathi David Hussein

Phuong Anh Cao

Alexander D Todd

Mark Gregory Goode

Kevin Joseph Cann

Roger L Kuhlman

Timothy R Lynn

John H Moorhouse

Dongming Li

Garth Ronald Giesbrecht

Haiqing Peng

Timothy M Boller

Donna Jean Crowther

James McLeod Farley

Steven A Best

Jackie Lovell

John Francis Szul

Sun-Chueh Kao

Laughlin G McCullough

Parul A Khokhani

Mahsa McDougal

Garth R Giesbrecht

George Rodriguez

Daniel D VanderLende

F David Hussein

Michael D Awe

Lixin Sun

Cliff Robert Mure

Peter S Martin

Ian M Munro

Steven D Brown

Daniel P Zilker

Kevin P Ramirez

Xianyi Cao

Mahsa Heydari

Laughlin G Mccullough

Mahsa Mcdougal

Fathi D Hussein

Donna J Crowther

Steve D Brown

A system and method of producing polyethylene, including: polymerizing ethylene in presence of a catalyst system in a reactor to form polyethylene, wherein the catalyst system includes a first catalyst and a second catalyst; and adjusting reactor conditions and an amount of the second catalyst fed to the reactor to control melt index (MI), density, and melt flow ratio (MFR) of the polyethylene.

Method of producing polyethylene and polyethylene thereof

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.

Producing polyolefin products

Catalyst systems and methods for making and using the same are disclosed. A catalyst composition is provided that includes a catalyst compound supported to form a supported catalyst system, the catalyst compound including: where each of R, R, R, R, R, R, Rand X are as discussed herein.

Catalysts for control of long chain branching

A polymerization catalyst system, a method of using the polymerization catalyst system, and a polymer produced with the catalyst system. The polymerization catalyst system has a non-metallocene catalyst and a metallocene catalyst. The metallocene catalyst has the formula: wherein Rand Rare each independently, phenyl, methyl, chloro, fluoro, or a hydrocarbyl group.

A high density, high polydispersity polyethylene having improved properties, and a process of producing same.

Bimodal polyethylene resins

Embodiments of the present disclosure are directed towards metal complexes that can be utilized to form polymers. As an example, the present disclosure provides a metal complex of Formula I: wherein each Me represents methyl. 

Metal complexes

The present disclosure provides a method of determining a relative decrease in catalytic efficacy of a catalyst in a test sample of a catalyst solution with unknown catalytic activity. The method includes (a) mixing the test sample with a test solvent to form a test mixture and (b) measuring the increase in the temperature of the test mixture at predetermined time intervals immediately after forming the test mixture. A predetermined feature is used to determine both a test value in the increase in temperature measured in (b) and a control value in a known increase in temperature of a control mixture of the test solvent with a control sample of a control catalyst solution. The relative decrease in catalytic efficacy of the catalyst in the test sample having the unknown catalytic activity is then determined from: Relative Decrease in Catalytic Efficacy=Control Value&#x2212;Test Value/Control Value.

Method of determining a relative decrease in catalytic efficacy of a catalyst in a catalyst solution

Embodiments of the present disclosure directed towards polymerization catalysts having improved ethylene enchainment. As an example, the present disclosure provides a polymerization catalyst having improved ethylene enchainment, the polymerization catalyst comprising a zirconocene catalyst of Formula (I) where Ris a Cto Calkyl, aryl or aralkyl group, wherein Ris an Cto Calkyl, aryl or aralkyl group, and where Ris a Cto Calkyl or a hydrogen, and where each X is independently a halide, Cto Calkyl, aralkyl group or hydrogen. 

Polymerization catalysts with improved ethylene enchainment

Synthetic methods for the preparation of ligands and metal-ligand complexes are disclosed.

Synthesis of benzyloxyphenoxy phenol ligands

Embodiments of the present disclosure are directed towards metal complexes that can be utilized to form polymers. As an example, the present disclosure provides a metal complex of Formula (I) wherein M is Zr, Hf, or Ti; each Het is independently a heterocyclic; each L is independently a bridging group; each X is independently Cl, Br, I, or alkyl; each Ris independently selected from the group including hydrogen, alkyls, alkenyls, alkynyls, cycloalkyls, aryls, acyls, aroyls, alkoxys, aryloxys, alkylthiols, dialkylamines, alkylamidos, alkoxycarbonyls, aryloxycarbonyls, carbomoyls, alkyl- and dialkyl-carbamoyls, acyloxys, acylaminos, aroylaminos, aromatic rings, fused aromatic rings, and combinations thereof; and each n is independently an integer having a value of one to five. 

Disclosed are novel bridged bi-aromatic phenol ligands and transition metal catalyst compounds derived therefrom. Also disclosed are methods of making the ligands and transition metal compounds, and polymerization processes utilizing the transition metal compounds for the production of olefin polymers.

Bridged bi-aromatic ligands and olefin polymerization catalysts prepared therefrom

Growing community of inventors

Houston, TX, United States of America

C Jeff Harlan