Union Carbide Chemicals & Plastics Technology Corporation

Univation Technologies, LLC

Exxonmobil Chemical Patents Inc.

Union Carbide Chemicals and Plastics Company, Inc.

Fathi David Hussein

Kiu H Lee

Daniel Paul Zilker, Jr

Timothy R Lynn

James McLeod Farley

C Jeff Harlan

Timothy Marlow Boller

David Michael Glowczwski

Kevin Joseph Cann

Bruce Jon Savatsky

Ronald Steven Eisinger

Francis Charles Rix

Agapios Kyriacos Agapiou

Ching-Tai Lue

Robert Olds Hagerty

Dongming Li

Chi-I Kuo

Michael E Muhle

Richard B Pannell

Jose Fernando Cevallos-Candau

Steven A Best

Daniel P Zilker

Gary David Mohr

Wesley R Mariott

Zerong Lin

Michael D Awe

Phuong Anh Cao

Kevin Bruce Stavens

R Eric Pequeno

Randall B Laird

Allen Noshay

Natarajan Anand Muruganandam

Edgar C Baker

Brandon C Locklear

Keith Wesley Trapp

Edward F Smith

Xinlai Bai

Michael E Sieloff

Ted A Powell

Mark Gregory Goode

Eric John Markel

Clark Curtis Williams

Haiqing Peng

Ping P Cai

William Albert Matthews

Gary Harry Williams

Ian D Burdett

David Merrill Rebhan

David Mason Gaines

Daniel N Thomas, Jr

David N Edwards

James W Nicoletti

Thomas James McNeil

W Scott Hamilton

Reginald W Geck

Weldon Clifford Cummings

Rich John Stolz

Gyung-Ho Song

Daniel N Thomas

Christopher Scott Hunnisett

William David Vacek

Douglas J Miller

Mark Edwin O'Rosky

Henry B Hinckley

Joseph Patrick Welch

Ronald Irvin Raether

David Nunn Jones

Robert Steven Eisinger

David M Gaines

Han T Liu

Natarajan Muruganandam

William A Matthews

Jeff C Harlan

Timothy M Boller

Jose F Cevallos-Candau

Jr Daniel P Zilker

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

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.

Producing polyolefin products

Methods for reducing gels and/or dome sheeting in gas phase polymerization processes and their resulting products are provided. The polymerization processes include polymerizing ethylene and one or more optional comonomers in a fluidized bed reactor in the presence of a metallocene catalyst, hydrogen, and at least one condensing agent.

Methods for making polyethylene polymers

The use of induced condensing agent (ICA) in fluidized bed gas phase reactor systems enables higher production rates but can affect the resulting polyolefins melt index. The effect the increased ICA concentration may have on a melt index may be counteracted, if necessary, by altering the concentration of olefin monomer within the reactor system.

Methods of controlling polyolefin melt index

Polymerization catalyst compositions are provided as are methods of their preparation. The compositions comprise fatty amines and find advantageous use in olefin polymerization processes. The catalyst composition comprises at least one supported polymerization catalyst wherein the catalyst composition is modified with at least one fatty amine wherein the fatty amine is substantially free of particulate inorganic material.

Catalyst composition, methods of preparation and use in a polymerization process

A method for transitioning a gas phase polymerization reactor between metallocene catalysts is provided. The method comprises first reducing the superficial gas velocity and increasing the height of the fluidized bed within the reactor prior to stopping a feed comprising a first metallocene catalyst. The method further comprises introducing a first polymerization neutralizer to the reactor, wherein the first polymerization reactor does not comprise water, and then introducing a second polymerization neutralizer to the reactor, wherein the second polymerization neutralizer is different from the first polymerization neutralizer. After this, the method comprises purging the reactor with an inert gas and then introducing a feed comprising a second metallocene catalyst to the reactor.

Closed reactor transitions between metallocene catalysts

The catalyst productivity of a polyolefin catalyst in the methods disclosed herein may be increased by increasing the concentration of an induced condensing agent (ICA) in the reactor system. The effect the increased ICA concentration may have on a melt index may be counteracted, if necessary, in various ways.

Methods of controlling polyolefin melt index while increasing catalyst productivity

Continuity compositions are provided as are methods of their preparation. The compositions comprise metal carboxylate salts and fatty amines and find advantageous use in olefin polymerization processes.

Continuity compositions and methods of making and using the same

Processes for the polymerization of olefins with extracted metal carboxylate salts are provided. The polymerization processes have increased productivity and/or increased resin bulk density.

Processes for the polymerization of olefins with extracted metal carboxylate salts

A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least substantially uniformly and in liquid form) to each surface, and optionally (where a catalyst component of the solution catalyst comprises at least one chromium containing compound) oxidizing at least some of the applied chromium containing compound in a controlled manner.

Methods for applying solution catalysts to reactor surfaces

A process for the polymerization of olefin's, including: introducing an olefin and a polymerization catalyst into a polymerization reactor to form a polyolefin, the polymerization reactor including: a fluidized bed region having a top and a bottom; and a motive bed region; wherein a first end of the motive bed region is fluidly connected to the top of the fluidized bed region; and wherein a second end of the motive bed region is fluidly connected to the bottom of the fluidized bed region; and wherein a diameter of the fluidized bed region is greater than a diameter of the motive bed region; circulating at least a portion of the olefin, the catalyst, and the polyolefin through the fluidized bed region and the motive bed region; maintaining a dense-phase fluidized bed within the fluidized bed region; recovering polyolefin from the fluidized bed region, is provided. A reactor system directed to the process is also provided.

Reactor systems and processes for using the same

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Hilton Head Island, SC, United States of America

Fathi David Hussein