Process for the preparation of branched low-pressure polyethylene, new low-pressure polyethylenes, and preformed bifunctional catalysts

US5686542A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karl-Heinz Aleksander Ostoja-Starzewski · Bad Vilbel, DE
• Josef Witte · Cologne, DE
• Herbert Bartl · Odenthal, DE
• Karl-Heinz Reichert · Berlin, DE
• Georgios Vasiliou · Berlin, DE

Key dates

• Filing date: Sep 5, 1996
• Grant date: Nov 11, 1997
• Expiry date: Sep 5, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Branched low-pressure polyethylenes are prepared by oligomerization of ethylene on a nickel-containing catalyst and polymerization of the oligomers obtained, if appropriate in the presence of ethylene, on a chromium-containing catalyst.