Univation Technologies, LLC

Matthew Gary McKee

John Francis Szul

Mark Gregory Goode

Simon Mawson

Sun-Chueh Kao

Tae Hoon Kwalk

Kersten Anne Terry

Timothy Todd Wenzel

Timothy R Lynn

Robert J Jorgensen

David H McConville

John Henry Oskam

Robert Harold Vogel

James McLeod Farley

David James Schreck

Kersten Anne Erickson

Paul T Daniell

Ching-Tai Lue

George Alan Vaughan

Clark Curtis Williams

Gregory T Whiteker

Eric Lucas

Metallocene catalyzed polyethylenes are found to have improved physical properties, improved processability and improved balance of properties. Surprisingly, there is a direct relationship between MD shrinkage, and MD tear. Additionally, MD tear is greater than TD tear, and MD tear is also greater than intrinsic tear. MD tear to TD tear ratios are above 0.9, and dart drop impact is above 500 g/mil. The polyethylenes have a relatively broad composition distribution and relatively broad molecular weight distribution.

Polyethylene films with improved physical properties

The present invention provides polymerization catalyst compounds, catalyst systems including these catalyst compounds, and to their use in the polymerization of ethylene and at least one comonomer. In particular, the invention provides a catalyst system comprising a poor comonomer incorporating catalyst compound and a good comonomer incorporating catalyst compound. Preferably, the low comonomer incorporating catalyst compound is a metallocene containing at least one substituted or unsubstituted fused ring cyclopentadienyl based ligand which is substantially directed to the front of the molecule, contains a long bridging group, or which contains a methyl substitution pattern which correlates to poor comonomer incorporation. The invention also provides methods of selecting the poor comonomer incorporating metallocene to pair with the good comonomer incorporating metallocene to produce polymers that are easy to process into a variety of articles, especially polyethylene based film, having enhanced properties.

Mixed metallocene catalyst systems containing a poor comonomer incorporator and a good comonomer incorporator

The invention provides for polymerization catalyst compositions, and for methods for introducing the catalyst compositions into a polymerization reactor. More particularly, the method combines a catalyst component containing slurry and a catalyst component containing solution to form the completed catalyst composition for introduction into the polymerization reactor. The invention is also directed to methods of preparing the catalyst component slurry, the catalyst component solution and the catalyst compositions, to methods of controlling the properties of polymer products utilizing the catalyst compositions, and to polymers produced therefrom.

Bimodal polyolefin

Polymerization process

This invention relates to a process to polymerize olefin(s) comprising combining a solution, slurry or solid comprising one or more bulky ligand metallocene catalyst compounds, an optional support, and or one or more activator(s) with a solution comprising one or more phenoxide catalyst compounds, and thereafter, introducing one or more olefin(s) and the combination into a polymerization reactor. This invention also relates to a polymer of ethylene wherein the polymer has a density of 0.910 to 0.930 g/cc, a melt index of 0.3 to 2.0 dg/min, and a 15 to 35 &#x3bc;m thick film of the polymer has a 45&#xb0; gloss of 60 or more, a haze of 7% or less, and a dart impact of 600 g or more.

Catalyst composition, method of polymerization and polymer therefrom

This invention relates to methods to introduce multiple catalysts, activators or catalyst systems into a gas phase reactor.

Solution feed of multiple catalysts

Start up methods for multiple catalyst systems

Growing community of inventors

Charleston, WV, United States of America

Matthew Gary McKee