Univation Technologies, LLC

Exxon Chemical Patents, Inc.

Phillips Petroleum Company

Exxon Research and Engineering Company

Exxonmobil Chemical Patents Inc.

Exxon Chemical Company

Agapios Kyriacos Agapiou

Chi-I Kuo

Michael E Muhle

David Michael Glowczwski

Steven Kent Ackerman

F David Hussein

Gary Thomas Renola

Richard B Pannell

Robert Olds Hagerty

Eric John Markel

Steve K Ackerman

Gary David Mohr

Zerong Lin

Kevin Bruce Stavens

Edward F Smith

Keith Wesley Trapp

Kathryn Ann Russell

Michael E Sieloff

Ted A Powell

Patrick Brant

Bruce Jon Savatsky

Fathi David Hussein

Robert Lynn Santana

Dwayne Lee Litteer

Mark Gregory Goode

Kevin Joseph Cann

Anthony Nicholas Speca

Rainer Kolb

Laughlin G McCullough

James McLeod Farley

Jeevan Sahib Abichandani

Randall B Laird

John R Griffin

Christopher R Davey

Myron Bernard Kurtzman

X Simon Zhang

John L Allan

Felix I Jacobson

Simon X Zhang

John Francis Szul

Sun-Chueh Kao

Daniel Paul Zilker, Jr

Michael D Awe

Phuong Anh Cao

R Eric Pequeno

Marc L DeChellis

Ghanshyam Ganu H Patel

F Gregory Stakem

Ghanshyam H Patel

David M LaBorde

David C Schutz

David F Hussein

David Hussein

Chi-L Kuo

Steven K Ackerman

Francis Gregory Stakem

The invention relates to catalyst compositions including at least one catalyst compound and at least one continuity additive such as poly-oxo-metal carboxylate compound and their use in the polymerization of olefins.

Continuity additives and their use in polymerization processes

Catalyst compositions for the polymerization of olefins having improved flowability properties are provided.

Catalyst composition having improved flow characteristics 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 process for the production of an ethylene alpha-olefin copolymer is disclosed, the process including polymerizing ethylene and at least one alpha-olefin by contacting the ethylene and the at least one alpha-olefin with a metallocene catalyst in at least one gas phase reactor at a reactor pressure of from 0.7 to 70 bar and a reactor temperature of from 20&#xb0; C. to 150&#xb0; C. to form an ethylene alpha-olefin copolymer. The resulting ethylene alpha-olefin copolymer may have a density D of 0.927 g/cc or less, a melt index (I) of from 0.1 to 100 dg/min, a MWD of from 1.5 to 5.0. The resulting ethylene alpha-olefin copolymer may also have a peak melting temperature Tsatisfying the following relation: T&#x3e;D*398&#x2212;245.

Polymerization processes using metallocene catalysts, their polymer products and end uses

A continuity additive according to one general approach includes a substance having an ability to reduce, prevent, or mitigate at least one of fouling, sheeting, and static level of a material present in a polymerization reactor system when added to the reactor system in an effective amount, with the proviso that the substance is not a polysulfone polymer, a polymeric polyamine, or an oil-soluble sulfonic acid; and a scavenger contacted with the substance, optionally, the scavenger neutralizing water coming in contact therewith. Additional continuity additives, methods of making continuity additives, and use of continuity additives are also presented.

Catalyst compositions and methods of making and using the same

Catalyst and compositions and methods of making and using the same

A method of treating a gas phase fluidized bed reactor and a method of polymerizing olefins in a gas phase fluidized bed reactor in the presence of a catalyst prone to cause sheeting by introducing a chromium-containing compound into the reactor and forming a high molecular weight polymer coating on the walls of the reactor. Furthermore, a device for and method of introducing the chromium-containing compound into the fluidized bed reactor at a plurality of locations in proximity to a lower section of a bed section wall of the fluidized bed reactor, and forming a high molecular weight polymer coating on the bed section wall.

Methods and devices for polymerization

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

In some embodiments, a method in which at least one continuity additive ('CA') and a seed bed are pre-loaded into a reactor, and a polymerization reaction is optionally then performed in the reactor. In other embodiments, at least one flow improver, at least one CA, and a seed bed are pre-loaded into a reactor. Pre-loading of a reactor with a CA can significantly improve continuity of a subsequent polymerization reaction in the reactor during its initial stages, including by reducing sheeting and fouling. The CA can be pre-loaded in dry form (e.g., as a powder), or in liquid or slurry form (e.g., as an oil slurry). To aid delivery of a dry CA to the reactor and combination of the dry CA with a seed bed in the reactor, the dry CA can be combined with a flow improver and the combination of CA and flow improver then loaded into the reactor. Alternatively, the CA and flow improver can be sequentially loaded into the reactor, and then mixed together (and mixed with a seed bed) in the reactor after both the CA and flow improver have been separately loaded into the reactor.

Method for seed bed treatment before a polymerization reaction

Embodiments of the present invention relate to measuring and controlling static in a gas phase reactor polymerization. In particular, embodiments relate to monitoring carryover static in an entrainment zone during gas phase polymerization to determine the onset of reactor discontinuity events such as chunking and sheeting. Embodiments also relate to monitoring carryover static to determine the need for effective additions of continuity additives that minimize reactor static activity and thereby preventing discontinuity events.

Method for controlling sheeting in gas phase reactors

This invention relates to a process for maintaining heat transfer capacity of a cycle cooler while polymerizing olefin(s) in the presence of catalyst and a carboxylate metal salt by controlling the amount of carboxylate metal salt present in the reaction system. In particular, the invention relates to maintaining a cycle cooler performance parameter substantially constant while polymerizing olefin(s) in the presence of a carboxylate metal salt and a conventional-type transition metal polymerization catalyst compound, or a metallocene-type polymerization catalyst compound. This invention further relates to a process wherein the cycle cooler performance parameter is a heat transfer capacity of the cycle cooler, a pressure drop across the cooler, or a cooler approach temperature of a cycle cooler.

Method of maintaining heat transfer capacity in a polymerization reaction system

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Humble, TX, United States of America

Agapios Kyriacos Agapiou