Catalyst systems comprising a calcined chromium catalyst and a non-transition metal cyclopentadienyl cocatalyst

US6977235B2 · kind B2 · utility

Assignee

• Chevron Phillips Chemical Company LP · US

Inventors

• Max P. McDaniel · Bartlesville, US
• Elizabeth A. Benham · Bartlesville, US
• Steven J. Secora · Bartlesville, US
• Michael D. Jensen · Bartlesville, US
• Kathy S. Collins · Bartlesville, US

Key dates

• Filing date: Apr 22, 2004
• Grant date: Dec 20, 2005
• Expiry date: Apr 22, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F110/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

According to an embodiment, catalyst systems for polymerizing olefins include a catalyst comprising chromium and a cocatalyst comprising a substituted or unsubstituted non-transition metal cyclopentadienyl compound (Cp). The catalyst also comprises an inorganic oxide support. In an embodiment, methods of preparing a catalyst comprise contacting a support with chromium and with a non-transition metal Cp compound. In one embodiment, the support may be contacted with a solution comprising the non-transition metal Cp compound prior to entry into a reaction zone. In another embodiment, the activated catalyst and non-transition metal Cp compound may be added separately to the reaction zone.