Univation Technologies, LLC

Union Carbide Chemicals & Plastics Technology Corporation

Union Carbide Corporation

Union Carbide Chemicals and Plastics Company, Inc.

Union Carbidae Corporation

Kevin Joseph Cann

Mark Gregory Goode

John H Moorhouse

Wesley R Mariott

Maria A Apecetche

Daniel Paul Zilker, Jr

F David Hussein

Phuong Anh Cao

Frederick John Karol

Minghui Zhang

Ronald Steven Eisinger

Arthur E Marcinkowsky

Thomas Oswald

Jose Fernando Cevallos-Candau

Bruce Jon Savatsky

C Jeff Harlan

Kiu H Lee

Fathi David Hussein

Ping P Cai

Cliff Robert Mure

Yuanqiao Rao

William Albert Matthews

Thomas Edward Spriggs

Robert J Jorgensen

Michael D Awe

Agapios Kyriacos Agapiou

Timothy R Lynn

Sun-Chueh Kao

Richard B Pannell

Eric John Markel

Leonard Sebastian Scarola

Duan-Fan Wang

Stephen Paul Jaker

Kefu Sun

Robert Lorenz Boysen

Robert Darrell Olson

Xinlai Bai

David L Miles

Robert Olds Hagerty

Chi-I Kuo

James McLeod Farley

Garth Ronald Giesbrecht

David Michael Glowczwski

Lixin Sun

R Eric Pequeno

Robert Converse Brady, Iii

Ian M Munro

Kevin R Gross

Francois Alexandre

Maria Angelica Apecetche

James W Nicoletti

John Henry Moorhouse

Natarajan Muruganandam

Barbara J Kopp

Gary Harry Williams

Ann M Schoeb-Wolters

Robert Cecil Brown

Maria Pollard

Norma J Maraschin

C Dale Lester

Abarajith S Hari

Charles D Lester

Eugene H Theobald

Monika Brady

Debra L Beran

Weidong Wang

Gregory George Smith

Robert Joseph Noel Bernier

Robert Lynn Santana

Daniel P Zilker

William D Heitz

Paul T Daniell

Parul A Khokhani

Yimsan Gau

Thomas James McNeil

Christopher Scott Hunnisett

F Gregory Stakem

John H Moorehouse

Michael W Chen

David Joseph Dovedytis

Bai Xinlai

Sergey A Vasnetsov

Mark C Hwu

David C Schutz

Tomas T Tamargo

William A Matthews

Stephen P Jaker

Marke G Goode

David F Hussein

David Hussein

Gregory F Stakem

Embodiments of the present disclosure are directed towards method for modifying a polymer flow index. As an example, a method for modifying a polymer flow index can include providing monomers to a polymerization reactor, providing a chromium catalyst to the polymerization reactor, and providing an active amount of a flow index modifier to the polymerization reactor, wherein the flow index modifier is selected from carbon dioxide, carbon monoxide, 2,4-hexadiene, and combinations thereof.

Polymer flow index modifier

Polymerization process control methods for making polyethylene are provided. The process control methods include performing a polymerization reaction in a polymerization reactor to produce the polyethylene, where ethylene, and optionally one or more comonomers, in the polymerization reaction is catalyzed by an electron donor-free Ziegler-Natta catalyst and an alkyl aluminum co-catalyst. A melt flow ratio (I/I) of the polyethylene removed from the polymerization reactor is measured and an amount of long chain branching (LCB) of the polyethylene from the polymerization reactor is controlled by adjusting a weight concentration of the alkyl aluminum co-catalyst present in the polymerization reactor. In addition, an electron donor-free Ziegler-Natta catalyst productivity of the polyethylene being produced in the polymerization reactor is measured from which the amount of LCB of the polyethylene from the polymerization reactor is determined using the measured electron donor-free Ziegler-Natta catalyst productivity and a predetermined relationship between the electron donor-free Ziegler-Natta catalyst productivity and the LCB.

Process control for long chain branching control in polyethylene production

A system and method for charging a chromium-based catalyst to a mix vessel; introducing a reducing agent through an entrance arrangement into the mix vessel, and agitating a mixture of the chromium-based catalyst, the reducing agent, and a solvent in the mix vessel to promote contact of the reducing agent with the chromium-based catalyst to give a reduced chromium-based catalyst.

Polyolefin production with chromium-based catalysts

Disclosed herein are methods of controlling polymer properties in polymerization processes that use a chromium-based catalyst. An embodiment discloses a method of producing a polyolefin comprising: contacting a reaction mixture and a reduced chromium oxide catalyst in a gas-phase reactor to produce the polyolefin, wherein the reaction mixture comprises a monomer and a co-monomer; and changing a reaction temperature in the gas-phase reactor by about 1&#xb0; C. or more whereby a gas molar ratio of the co-monomer to the monomer is changed by about 2% or more and a co-monomer content of the polyolefin at substantially constant density is changed by about 2% or more. Additional methods and compositions are also provided.

Methods for controlling polymer properties

The present disclosure provides a method for improving the activity of Ziegler-Natta (ZN) catalysts. The method includes forming a modified precursor composition of a ZN catalyst by providing a precursor composition of the ZN catalyst for treatment with an aluminum alkyl compound in a liquid organic solvent. The precursor composition of the ZN catalyst includes at least one titanium compound. The at least one titanium compound in the precursor composition is treated with the aluminum alkyl compound in the liquid organic solvent, where the aluminum alkyl compound converts the at least one titanium compound in the precursor composition into a modified state of the ZN catalyst. At least a portion of the aluminum alkyl compound not consumed in converting the at least one titanium compound in the precursor composition into the modified state of the ZN catalyst and reaction by-product compounds in the liquid organic solvent are removed to form the modified precursor composition of the ZN catalyst.

Method for improving Ziegler-Natta catalyst activity

A method including contacting a chromium-based catalyst with a reducing agent in a solvent to lower an oxidation state of at least some chromium in the chromium-based catalyst to give a reduced chromium-based catalyst, drying the reduced chromium-based catalyst at a temperature, and adjusting the temperature to affect the flow index response of the reduced chromium-based catalyst.

A system and method for feeding a chromium-based catalyst to a polymerization reactor; adding a reducing agent to the chromium-based catalyst, and polymerizing an olefin into a polyolefin in the polymerization reactor in the presence of the chromium-based catalyst.

Catalyst systems and methods for making and using the same are provided. The catalyst system can include a catalyst support, wherein the catalyst support has an average particle size of about 2 microns to about 200 microns. Nanoparticles are adhered to the catalyst support, wherein the nanoparticles have an average particle size of about 2 to about 200 nanometers. A catalyst is supported on the catalyst support.

Supported catalyst with improved flowability

Polymerization process control methods for making polyethylene are provided. The process control methods include performing a polymerization reaction in a polymerization reactor to produce the polyethylene, where ethylene, and optionally one or more comonomers, in the polymerization reaction is catalyzed by an electron donor-free Ziegler-Natta catalyst and an alkyl aluminum co-catalyst. A melt flow ratio (I/I) of the polyethylene removed from the polymerization reactor is measured and an amount of long chain branching (LCB) of the polyethylene from the polymerization reactor is controlled by adjusting a weight concentration of the alkyl aluminum co-catalyst present in the polymerization reactor. In addition, an electron donor-free Ziegler-Natta catalyst productivity of the polyethylene being produced in the polymerization reactor is measured from which the amount of LCB of the polyethylene from the polymerization reactor is determined using the measured electron donor-free Ziegler-Natta catalyst productivity and a predetermined relationship between the electron donor-free Ziegler-Nana catalyst productivity and the LCB.

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Rocky Hill, NJ, United States of America

Kevin Joseph Cann