Univation Technologies, LLC

Union Carbide Chemicals & Plastics Technology Corporation

Symyx Solutions, Inc.

Daniel Paul Zilker, Jr

Kevin Joseph Cann

Mark Gregory Goode

Ching-Tai Lue

Dongming Li

Fathi David Hussein

Bruce Jon Savatsky

Francis Charles Rix

John H Moorhouse

F David Hussein

Timothy R Lynn

C Jeff Harlan

Kiu H Lee

Wesley R Mariott

Timothy Marlow Boller

Phuong Anh Cao

R Eric Pequeno

James McLeod Farley

Maria A Apecetche

Jose Fernando Cevallos-Candau

Minghui Zhang

Sun-Chueh Kao

Robert J Jorgensen

Chi-I Kuo

Burkhard Eric Wagner

Garth Ronald Giesbrecht

Steven A Best

Richard B Pannell

Eric John Markel

Mark Bradley Davis

Michael D Awe

Ronald Steven Eisinger

Tae Hoon Kwalk

John Henry Oskam

Stephen Paul Jaker

C Dale Lester

Abarajith S Hari

Pradeep P Shirodkar

Roger L Kuhlman

Agapios Kyriacos Agapiou

Rainer Kolb

Leonid Matsiev

Daniel D VanderLende

Porter Clarke Shannon

David Michael Glowczwski

Lixin Sun

Oleg Kolosov

Fred David Ehrman

Haiqing Peng

Cliff Robert Mure

Mark Williams Blood

Xinlai Bai

Ann M Schoeb-Wolters

Ian D Burdett

James Leland Swecker, Ii

David Mason Gaines

James W Nicoletti

Christopher Scott Hunnisett

Donald Robert Fields

William David Vacek

Mark Edwin O'Rosky

Sun-Cheuh Kao

Douglas H Jackson

Albert George Dietz, Iii

Robert Steven Eisinger

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

Polymers, and systems and methods for making and using the same are described herein. A polymer includes ethylene and at least one alpha olefin having from 4 to 20 carbon atoms. The polymer is formed by a trimmed catalyst system including a supported catalyst including bis(n-propylcyclopentadienyl) hafnium (R)(R) and a trim catalyst comprising meso-O(SiMeInd)Zr(R)(R), wherein Rand Rare each, independently, methyl, chloro, fluoro, or a hydrocarbyl group.

Producing polyolefin products with improved stiffness, toughness, and processability

Catalyst systems and methods for making and using the same are provided. The catalyst systems can include a plurality of silica particles and a metallocene catalyst and an activator supported on the plurality of silica particles. The polymerization catalysts have a particle size distribution in which about 10% of the particles have a size less than about 17 to about 23 micrometers, about 50% of the particles have a size less than about 40 to about 45 micrometers, and about 90% of the particles have a size less than about 72 to about 77 micrometers.

Preparation of polyolefin

Methods for producing catalyst systems with increased productivity are disclosed. The methods may comprise providing a catalyst composition comprising a solvent and a single-site catalyst component, heating an inert gas to a temperature in a range of from about 100&#xb0; C. to about 150&#xb0; C., and spray drying the catalyst composition in the presence of the inert gas to form a spray-dried catalyst system. Additionally, the methods may comprise providing a catalyst composition comprising a solvent, an activator, a filler material, a metallocene catalyst, and a Group 15-containing catalyst; heating an inert gas to a temperature in a range of from about 100&#xb0; C. to about 150&#xb0; C.; and spray drying the catalyst composition in the presence of the inert gas to form a spray-dried catalyst system.

Methods for preparing catalyst systems with increased productivity

A method of polymerizing olefins is disclosed. The method comprises contacting ethylene and at least one comonomer with a catalyst system to produce a polyolefin polymer that is multimodal. The catalyst system comprises a first catalyst that promotes polymerization of the ethylene into a low molecular weight (LMW) portion of the polyolefin polymer and a second catalyst that promotes polymerization of the ethylene into a high molecular weight (HMW) portion of the polyolefin polymer. The first catalyst and at least a portion of the second catalyst are co-supported to form a commonly-supported catalyst system and at least a portion of the second catalyst is added as a catalyst trim feed to the catalyst system.

Producing polyolefin products

Polymers, and systems and methods for making and using the same are described herein. A polymer includes ethylene and at least one alpha olefin having from 4 to 20 carbon atoms. The polymer has a melt index ratio (MIR) greater than about 40. The polymer also has a value for Mw1/Mw2 of at least about 2.0, wherein Mw1/Mw2 is a ratio of a weight average molecular weight (Mw) for a first half of a temperature rising elution (TREF) curve from a cross-fractionation (CFC) analysis to an Mw for a second half of the TREF curve. The polymer also has a value for Tw1&#x2212;Tw2 of less than about &#x2212;15&#xb0; C., wherein Tw1&#x2212;Tw2 is a difference of a weight average elution temperature (Tw) for the first half of the TREF curve to a Tw for the second half of the TREF curve.

Spray-dried catalyst compositions comprising a transition metal complex and polymerization processes employing the same are disclosed herein. An embodiment provides a spray-dried catalyst composition comprising a transition metal catalyst component represented by the following formula: (I) and polymerization process employing the same. 

Spray-dried catalyst compositions and polymerization processes employing the same

A process for the production of ethylene alpha-olefin copolymers is disclosed. The process may include feeding a catalyst system comprising a supported metallocene, such as a hafnocene, having pores saturated with a selected liquid agent, to a gas phase polymerization reactor. Ethylene and an alpha-olefin may then be contacted with the supported metallocene in the gas phase polymerization reactor to produce an ethylene alpha-olefin copolymer. The copolymer may have a density of less than 0.93 g/cm, a melt index (I) of less than 2 dg/min, and a melt flow ratio (I/I) of at least 28. To advantageously result in desired effects on catalyst properties and/or polymer properties, the liquid agent may be selected to advantageously manipulate catalyst temperature profiles and/or catalyst-monomer interaction during an initial heating period when the catalyst is first introduced to the reactor.

Increased polymer melt flow ratio via feed of a supported catalyst saturated with a selected liquid agent

Methods and systems for olefin polymerization are provided. The method for olefin polymerization can include flowing a catalyst through an injection nozzle and into a fluidized bed disposed within a reactor. The method can also include flowing a feed comprising one or more monomers, one or more inert fluids, or a combination thereof through the injection nozzle and into the fluidized bed. The feed can be at a temperature greater than ambient temperature. The method can also include contacting one or more olefins with the catalyst within the fluidized bed at conditions sufficient to produce a polyolefin.

Methods and systems for olefin polymerization

Catalyst systems and methods for making and using the same. The catalyst system can include a single site catalyst compound, a support comprising fluorinated alumina, and an aluminoxane. The aluminoxane can be present in an amount of about 10 mmol or less per gram of the support.

Catalyst systems and methods for using same to produce polyolefin products

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 process for polymerizing olefin(s) utilizing a cyclic bridged metallocene catalyst system to produce polymers with improved properties is provided. The catalyst system may include a cyclic bridged metallocene, L(R'SiR&#x2032;)LZrQ, activated by an activator, the activator comprising aluminoxane, a modified aluminoxane, or a mixture thereof, and supported by a support, where: Land Lare independently an unsubstituted or a substituted cyclopentadienyl ligand bonded to Zr and defined by the formula (CHR), where R is hydrogen, a hydrocarbyl substituent, a substituted hydrocarbyl substituent, or a heteroatom substituent, and where d is 0, 1, 2, 3 or 4; Land Lare connected to one another with a cyclic silicon bridge, R&#x2032;SiR&#x2032;, where R&#x2032; are independently hydrocarbyl or substituted hydrocarbyl substituents that are connected with each other to form a silacycle ring; and each Q is a labile hydrocarbyl or a substituted hydrocarbyl ligand.

Metallocene catalysts and their use in polymerization processes

Growing community of inventors

Charleston, WV, United States of America

Daniel Paul Zilker, Jr