Univation Technologies, LLC

Barbara J Kopp

Mark Gregory Goode

Kevin Joseph Cann

Cliff Robert Mure

John H Moorhouse

William Albert Matthews

Francois Alexandre

Dongming Li

Ronald Steven Eisinger

Maria Pollard

John H Moorehouse

William A Matthews

Disclosed herein are methods of controlling polymer properties in polymerization processes that use a chromium-based catalyst. An embodiment discloses a method of producing a polyolefin comprising: contacting a reaction mixture and a reduced chromium oxide catalyst in a gas-phase reactor to produce the polyolefin, wherein the reaction mixture comprises a monomer and a co-monomer; and changing a reaction temperature in the gas-phase reactor by about 1&#xb0; C. or more whereby a gas molar ratio of the co-monomer to the monomer is changed by about 2% or more and a co-monomer content of the polyolefin at substantially constant density is changed by about 2% or more. Additional methods and compositions are also provided.

Methods for controlling polymer properties

A film formed from a polyethylene copolymer using a reduced chromium oxide catalyst, ethylene monomers and a co-monomer selected from butene monomers or 1-hexene, where the polyethylene copolymer has a density in the range of from about 0.935 to about 0.950 g/cmand an I/Iin a range of about 18.0 to about 30.0. The film formed from the polyethylene copolymer has a dart drop impact (g/&#x3bc;m) that significantly greater as compared to a film of the polyethylene copolymer formed using a silyl chromate catalyst in place of the reduced chromium oxide catalyst. A method of making such films is also provided.

Polyolefin film with improved toughness

Disclosed herein are various methods and systems for gas and liquid phase polymer production. In certain embodiments, the methods comprise manipulating properties of polymers produced by adjusting the hydrogen feed rate.

Systems and methods for fabricating polymers

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Middlesex, NJ, United States of America

Barbara J Kopp