Catalyst systems of the ziegler-natta type and a process for preparing them

US6730753B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Klaus Fottinger · Bayreuth, DE
• Stephan Huffer · Birkenfeld, DE
• Rainer Karer · Kaiserslautern, DE

Key dates

• Filing date: Aug 28, 2001
• Grant date: May 4, 2004
• Expiry date: Aug 28, 2021

Classification

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

Abstract

Catalyst systems of the Ziegler-Natta type, which are suitable for the polymerization of olefins are prepared by:A) bringing an inorganic metal oxide on which a magnesium compound has been deposited into contact with a tetravalent titanium compound,B) if desired, bringing the intermediate obtained in this way into contact with an electron donor compound andC) bringing the intermediate obtained in step A) or B) into contact with a polysiloxane.