Start up methods for multiple catalyst systems

US6372868B1 · kind B1 · utility

Assignee

• Univation Technologies, LLC · US

Inventors

• John F. Szul · Nitro, US
• Kersten Anne Erickson · South Charleston, US
• Simon Mawson · Charleston, US
• Paul T. Daniell · Tornado, US
• Mark G. Goode · Hurricane, US
• Matthew McKee · Blacksburg, US

Key dates

• Filing date: Dec 7, 1999
• Grant date: Apr 16, 2002
• Expiry date: Dec 7, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/905
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention relates to a method to introduce multiple catalysts into a gas or slurry phase reactor comprising:(a) introducing one or more olefins and a first catalyst and an activator into the reactor and allowing the olefins to polymerize,(b) obtaining a polyolefin,(c) introducing a second catalyst and an optional activator into the first catalyst/activator composition and thereafter introducing the combination into the reactor and allowing the olefins to polymerize.This invention further relates to a method to introduce multiple catalysts into a gas or slurry phase reactor comprising:(a) introducing one or more olefins, a first catalyst and an activator, and a second catalyst and an optional activator into the reactor, wherein the all the catalysts and activators are combined together prior to being introduced into the reactor.