Univation Technologies, LLC

Parul A Khokhani

Sun-Chueh Kao

Francis Charles Rix

C Jeff Harlan

Phuong Anh Cao

Mark G Goode

Mark Gregory Goode

Kevin Joseph Cann

John H Moorhouse

Dongming Li

George Rodriguez

Garth Ronald Giesbrecht

Lixin Sun

Kevin R Gross

Tomas T Tamargo

Jeff Harlan C

Kevin J Cann

Modified chromium-based catalyst compositions for olefin polymerization are disclosed. The modifiers prevent or reduce catalyst particle aggregation providing improved catalyst particle dispersion and consistent flow index response of the compositions in olefin polymerization.

Chromium-based catalyst compositions for olefin polymerization

Disclosed herein are methods of preparing a catalyst system comprising a spray-dried activator and polymerization processes employing these catalyst systems.

Methods of preparing a catalyst system

Described herein are methods comprising contacting one or more olefins with a catalyst system in a polymerization reactor at conditions sufficient to produce a polyolefin, wherein the catalyst system comprises a first metallocene catalyst compound comprising a first transition metal atom, two cyclopentadienyl ligands bound to the first transition metal atom, and two leaving groups bound to the first transition metal atom, wherein at least one leaving group is selected from the group consisting of a halo-phenoxy and a halo-alkoxy; wherein the first metallocene catalyst compound has a catalyst productivity that is at least 20% greater than a comparative metallocene catalyst compound used to produce the same polyolefin, wherein the comparative metallocene catalyst compound is the same as the first metallocene catalyst compound except neither leaving group is a halo-phenoxy or a halo-alkoxy.

Methods for producing polyolefins with catalyst systems

A polymerization catalyst system and polymerization processes using the catalyst systems are disclosed. The polymerization catalyst systems may include a) a first catalyst compound, and b) a second catalyst compound, wherein the first catalyst compound includes an oxadiazole-containing compound. In some embodiments, the oxadiazole-containing compound has essentially no hydrogen response, thus allowing better and/or tailored control of product properties when producing polymers using the catalyst system.

Mixed metal catalyst systems having a tailored hydrogen response

The present invention relates to a catalyst composition of a supported activator, a catalyst compound and an ionizing activator and its use in a process for polymerizing olefin(s). The invention is also directed to a method for making the catalyst composition above.

Method for preparing a catalyst composition and its use in a polymerization process

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Manalapan, NJ, United States of America

Parul A Khokhani