Olefin polymerization

US6197899A · kind A · utility

Assignee

• Phillips Petroleum Company · US

Inventors

• Kent E. Mitchell · Bartlesville, US
• Max P. McDaniel · Bartlesville, US
• M. Bruce Welch · Bartlesville, US
• Elizabeth A. Benham · Bartlesville, US
• Grover W. Cone · Bartlesville, US

Key dates

• Filing date: Feb 27, 1995
• Grant date: Mar 6, 2001
• Expiry date: Feb 27, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/904
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process is disclosed for the particle form polymerization of olefins. The process employs a titanium-containing having hydrocarbon soluble titanium components. The resulting catalyst is pretreated with an organometallic reducing agent prior to the introduction of the catalyst into the polymerization zone to give a catalyst which can be used satisfactorily in a loop reactor with lower levels of cocatalyst.