Methods for polymerization using spray dried and slurried catalyst

US8497330B2 · kind B2 · utility

Assignee

• Univation Technologies, LLC · US

Inventors

• F. David Hussein · Cross Lanes, US
• Kevin J. Cann · Montgomery, US
• Ann M. Schoeb-Wolters · Lebanon, US
• Phuong A. Cao · Old Bridge, US
• Bruce J. Savatsky · Kingwood, US
• Eric J. Markel · Kingwood, US
• Daniel P. Zilker, Jr. · Charleston, US
• Garth R. Giesbrecht · Diemelstraße, US

Key dates

• Filing date: Dec 22, 2010
• Grant date: Jul 30, 2013
• Expiry date: Oct 19, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Methods for gas phase olefin polymerization are provided. The method can include combining a spray dried catalyst system with a diluent to produce a catalyst slurry. The catalyst system can include a metallocene compound. Ethylene, a continuity additive, and the catalyst slurry can be introduced to a gas phase fluidized bed reactor. The reactor can be operated at conditions sufficient to produce a polyethylene. The spray dried catalyst system can have a catalyst productivity of at least 12,000 grams polyethylene per gram of the catalyst system.