Process for producing low molecular-weight poly-1-olefins

US5917100A · kind A · utility

Assignee

• Clariant Corporation · DE

Inventors

• Ludwig Bohm · Mainz, DE
• Hans-Friedrich Herrmann · Darmstadt, DE
• Joachim Berthold · Prien am Chiemsee, DE
• Gerd Hohner · Gersthofen, DE
• Rainer Lecht · Kelkheim, DE
• Hans Joachim Vetter · Bad Soden am Taunus, DE

Key dates

• Filing date: May 28, 1997
• Grant date: Jun 29, 1999
• Expiry date: May 28, 2017

Classification

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

Abstract

A catalyst formed by the reaction of a magnesium alkoxide dispersion having a particle size of from 100 to 3000 nm with a compound of a metal selected from the group comprising titanium, zirconium, vanadium and chromium and then with a chlorine-containing organoaluminum compound possesses a very good hydrogen responsiveness and a high activity even in the presence of molecular-weight regulators such as hydrogen. The catalyst is therefore outstandingly suitable for the production of low molecular-weight polyolefins. The catalyst makes possible the production of waxes having a reduced residual ash content. The large particle diameter and the low fines content of the polymer powder produced by suspension polymerization with this catalyst enables easy removal of the suspension medium and drying. The catalyst is furthermore advantageously used in solution polymerization and, because of the large particle diameter, in gas phase polymerization for producing low molecular-weight poly-1-olefins.