Methods for controlling die swell in dual catalyst olefin polymerization systems

US9650459B2 · kind B2 · utility

Assignee

• Chevron Phillips Chemical Company LP · US

Inventors

• Jeff F. Greco · Tulsa, US
• Qing Yang · Bartlesville, US
• Vivek Rohatgi · Owasso, US
• Mark L. Hlavinka · Tulsa, US
• Jim B. Askew · Barnsdall, US

Key dates

• Filing date: Sep 9, 2015
• Grant date: May 16, 2017
• Expiry date: Sep 9, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Methods for controlling the die swell of an olefin polymer produced using a dual catalyst system are disclosed. The die swell of the olefin polymer can be increased or decreased as a function of the catalyst weight ratio and the reactant molar ratio used during the olefin polymerization process.