Method for producing a poly-1-olefin in the presence of a ziegler catalyst

US7008898B1 · kind B1 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Frank Alt · Frankfurt, DE
• Paul-Richard Schoneborn · Kriftel, DE
• Ludwig Bohm · Mainz, DE

Key dates

• Filing date: Nov 17, 2000
• Grant date: Mar 7, 2006
• Expiry date: Mar 17, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F10/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing a poly-1-olefin by polymerisation of a 1-olefin of the formula R4CH═CH2, in which R4 is hydrogen or an alkyl radical having from 1 to 10 carbon atoms, in suspension, in solution or in the gas phase, at a temperature of from 20 to 200° C. and a pressure of from 0.5 to 50 bar, in the presence of a catalyst which consists of the product of the reaction of a magnesium alkoxide with a transition-metal compound (component a) and an organometallic compound (component b), whose component a has been produced by reacting a transition-metal compound of titanium, zirconium, vanadium or chromium with a gelatinous dispersion of the magnesium alkoxide in an inert hydrocarbon. In accordance with the invention, the gelatinous dispersion is obtained by stirring using a stirring element, or shearing using a high-performance shearing tool, a suspension of magnesium alkoxide powder having a mean particle size, expressed as the d50 value, of less than 15 μm, obtained by dry-grinding of commercially available magnesium alkoxide powder having a mean particle size, expressed as the d50 value, of greater than or equal to 15 μm, preferably in the range from 100…