Preparation of polyolefin

US9540460B2 · kind B2 · utility

Assignee

• Univation Technologies, LLC · US

Inventors

• C. Dale Lester · South Charleston, US
• Kevin J. Cann · Montgomery, US
• Phuong A. Cao · Old Bridge, US
• Abarajith S. Hari · Ridgecrest, US
• F. David Hussein · Cross Lanes, US
• Wesley R. Mariott · Freeport, US
• John H. Moorhouse · Kendall Park, US
• Richard B. Pannell · Kingwood, US
• Bruce J. Savatsky · Kingwood, US
• Daniel P. Zilker, Jr. · Charleston, US
• Mark G. Goode · Hurricane, US

Key dates

• Filing date: Nov 20, 2013
• Grant date: Jan 10, 2017
• Expiry date: Nov 20, 2033

Classification

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

Abstract

Catalyst systems and methods for making and using the same are provided. The catalyst systems can include a plurality of silica particles and a metallocene catalyst and an activator supported on the plurality of silica particles. The polymerization catalysts have a particle size distribution in which about 10% of the particles have a size less than about 17 to about 23 micrometers, about 50% of the particles have a size less than about 40 to about 45 micrometers, and about 90% of the particles have a size less than about 72 to about 77 micrometers.