Chevron Phillips Chemical Company LP

Phillips Petroleum Company

Chevron Philips Chemical Company, LP

Gary L Glass

Qing R Yang

Rex E Murray

Errun Ding

William B Beaulieu

Alan L Solenberger

Kumudini Jayaratne

Kensha Marie Clark

Ted H Cymbaluk

Steve J Secora

Max P McDaniel

Tony R Crain

Albert P Masino

Joel L Martin

M Bruce Welch

Youlu Yu

Syriac J Palackal

Jeff F Greco

Helmut G Alt

Gil R Hawley

Ted M Pettijohn

Darryl R Fahey

Steven J Secora

Bernd Peifer

Kent E Mitchell

Randall S Muninger

L Matthew Kirchman

Robert K Provence

Leigh A Ford

Michael D Jensen

John D Hottovy

Carleton E Stouffer

Jeffrey F Greco

Kumudini C Jayaratne

Qing Yang

Methods for preparing metallocene-based catalyst systems containing an activator-support are disclosed. These methods are directed to contacting an activator-support, an organoaluminum compound, and a mixture containing a metallocene compound and cyclohexene or a mixture of cyclohexane and 1-hexene, resulting in catalyst systems with increased catalytic activity for the polymerization of olefins. The olefin polymers can be used to produce film products with high haze values.

Production of high haze films using metallocene-based catalyst systems in cyclohexene

Methods for preparing metallocene-based catalyst systems containing an activator-support are disclosed. These methods can include contacting a solid metallocene compound, an activator-support, and an organoaluminum compound, resulting in catalyst systems with increased catalytic activity as compared to catalyst systems utilizing a solution of the metallocene compound.

Processes for preparing solid metallocene-based catalyst systems

Disclosed herein are ethylene-based polymers having a melt index less than 50 g/10 min, a ratio of Mw/Mn from 4 to 20, a density from 0.90 to 0.945 g/cm, and a substantially constant short chain branch distribution. These polymers can be produced using a dual catalyst system containing a boron bridged metallocene compound with a cyclopentadienyl group and an indenyl group, and a single atom bridged metallocene compound with a fluorenyl group.

Dual catalyst systems for producing polymers with a broad molecular weight distribution and a uniform short chain branch distribution

Methods for preparing metallocene-based catalyst systems containing an activator-support are disclosed. These methods are directed to contacting an activator-support, an organoaluminum compound, and a mixture containing a metallocene compound and cyclohexene or a mixture of cyclohexane and 1-hexene, resulting in catalyst systems with increased catalytic activity for the polymerization of olefins.

Processes for preparing metallocene-based catalyst systems in cyclohexene

The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.

Dual metallocene catalyst systems for decreasing melt index and increasing polymer production rates

The present invention provides dual catalyst systems containing a metallocene catalyst and a hydrogen scavenging catalyst, and polymerization processes employing these dual catalyst systems. Due to a reduction in hydrogen levels in the polymerization processes, olefin polymers produced from these polymerization processes may have a higher molecular weight, a lower melt index, and higher levels of unsaturation.

Use of hydrogen scavenging catalysts to control polymer molecular weight and hydrogen levels in a polymerization reactor

Methods for controlling properties of an olefin polymer using an organozinc compound are disclosed. The HLMI/MI shear ratio of the polymer can be decreased and the Mz/Mw ratio of the polymer can be increased via the addition of the organozinc compound.

Methods for controlling dual catalyst olefin polymerizations with an organozinc compound

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Dewey, OK, United States of America

Gary L Glass