Univation Technologies, LLC

Exxonmobil Chemical Patents Inc.

Michael E Sieloff

Gary David Mohr

Agapios Kyriacos Agapiou

Michael E Muhle

Zerong Lin

David Michael Glowczwski

Kevin Bruce Stavens

Keith Wesley Trapp

Edward F Smith

Ted A Powell

Robert Olds Hagerty

Fathi David Hussein

F David Hussein

Randall B Laird

Richard B Pannell

Eric John Markel

Linda Maria Van Den Bossche

Jean-Marc C Dekoninck

Nancy G Vogelaers

Jerome Holveck

Bernard K Beh

Arnaud F Alabrune

David F Hussein

Linda Maria Gisela Van Den Bossche

Arnaud Francis Alabrune

Bernard Keng-Hua Beh

Nancy Vogelaers

A polymeric composition that is suitable for use as a film or a coating. The polymeric composition comprises: (a) a first component comprising copolymer derived from ethylene and one or more Cto C&#x3b1;-olefin comonomers. The first component has a density of about 0.911 to about 0.918 g/cm, a compositional distribution breadth index (CDBI) of about 60% to about 85%, a melt index (MI) of about 16.0 to about 30.0 g/10 min, a molecular weight distribution (MWD) of about 1.5 to about 4.0, and a melt index ratio (MIR) of less than about 25; and (b) a second component comprising a low density polyethylene (LDPE). The second component has a g' of about 0.8 to about 0.15 and a MI that is lower than the MI of the first component.

Polyolefin compositions and products made therefrom

Methods for shutting down and restarting polymerization in a gas phase polymerization reactor are provided. The method can include introducing a polymerization neutralizer to the reactor in an amount sufficient to stop polymerization therein. The method can also include stopping recovery of a polymer product from the reactor and stopping introduction of a catalyst feed and a reactor feed to the reactor. The method can also include adjusting a pressure within the reactor from an operating pressure to an idling pressure. The method can also include adjusting a superficial velocity of a cycle fluid through the reactor from an operating superficial velocity to an idling superficial velocity. The method can also include maintaining the reactor in an idled state for a period of time.

Methods for operating a polymerization reactor

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

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Houston, TX, United States of America

Michael E Sieloff