Exxonmobil Chemical Patents Inc.

Richard E Pequeno

Matthew William Holtcamp

Bruce Jon Savatsky

Xuan Ye

Charles J Harlan

Adriana S Silva

Ching-Tai Lue

Matthew S Bedoya

Laughlin G McCullough

Ryan Winston Impelman

Dongming Li

David F Sanders

Robert Olds Hagerty

Michael E Muhle

Richard B Pannell

James McLeod Farley

Eric John Markel

Antonios K Doufas

Mark Bradley Davis

Kevin A Stevens

Rohan A Hule

Mark Williams Blood

Brandon C Locklear

Hasnain Rangwalla

Arturo Leyva

Giriprasath Gururajan

Nicolas M De Ketelaere

Matthew F Yott

A bimodal polyethylene is provided. The bimodal polyethylene may include a high molecular weight portion having a weight average molecular weight (M) of 100,000 g/mol to 1,000,000 g/mol and a low molecular weight portion having a Mof 10,000 g/mol to 80,000 g/mol. Polymer extrudates, such as cable-coatings and/or wire-coatings and films, including the bimodal polyethylene as well as methods of making the polymer extrudates are also provided.

Polyethylene extrudates and methods of making the same

A method for controlling the start up conditions in a gas phase polymerization process is provided. An inventory can be calculated for each monomer, comonomer, and hydrogen sufficient to produce a polyethylene polymer having desired properties, such as, a certain melt index and/or density.

Methods for controlling start up conditions in polymerization processes

A process for testing a commercial polyolefin condensed mode operation on a pilot plant scale is provided. A feed stream including one or more olefin monomers and one or more inert fluids can be introduced to a fluidized bed contained within a reactor housing having a length to diameter ratio of 1.0 to 20. The one or more olefin monomers can be contacted with one or catalysts within the fluidized bed at conditions sufficient to produce a polyolefin. A cycle gas stream can be withdrawn from the housing, the cycle gas stream having a gas velocity of 1.0 ft/sec to 3.0 ft/sec and including the unreacted monomers and the inert fluids. The cycle gas stream can be compressed to a pressure above the reaction pressure within the housing. The cycle gas stream can be cooled to a temperature that is above the dew point of the cycle gas, and a portion of the compressed cycle gas stream can be removed to create a side stream of the compressed cycle gas stream. The side stream can be cooled to a temperature that is below its dew point to create a gas-liquid mixture, and the cycle gas stream and the cooled side stream including the gas-liquid mixture can be returned to the reactor housing.

Pilot plant scale semi-condensing operation

Polyethylene compositions including at least 65 wt % ethylene derived units and from 0 to 35 wt % of C-Colefin comonomer derived units, based upon the total weight of the polyethylene composition are provided. The polyethylene compositions have a) an RCI,m of 100 kg/mol or greater and one or both of: b) a Tw-Twvalue of from &#x2212;16 to &#x2212;38&#xb0; C.; and c) an Mw/Mwvalue of at least 0.9. The polyethylene compositions may be used to manufacture articles such as films.

Polyethylene compositions and articles made therefrom

The present disclosure provides processes for polymerizing olefin(s). Methods can include contacting a first composition and a second composition in a line to form a third composition. The first composition can include a contact product of a first catalyst, a second catalyst, a support, a first activator, a mineral oil. The second composition can include a contact product of an activator, a diluent, and the first catalyst or the second catalyst. Methods can include introducing the third composition from the line into a gas-phase fluidized bed reactor, introducing a condensing agent to the line and/or the reactor, exposing the third composition to polymerization conditions, and/or obtaining a polyolefin. Polyethylene compositions including at least 65 wt % ethylene derived units, based upon the total weight of the polyethylene composition, are provided.

Polymerization processes and polymers made therefrom

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Baytown, TX, United States of America

Richard E Pequeno