Preparation of polyethylene

US6844408B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Andrei Gonioukh · Liblar, DE
• Lars Wittkowski · Mannheim, DE
• Thomas Dröge · Neustadt, DE
• Ernst Fischer · Langensendelbach, DE
• Roger Klimesch · Ransbach-Baumbach, DE
• Philipp Rosendorfer · Neustadt, DE
• Gernot Kohler · Ludwigshafen, DE
• Dieter Littmann · Heßheim, DE

Key dates

• Filing date: Mar 13, 2001
• Grant date: Jan 18, 2005
• Expiry date: Mar 13, 2021

Classification

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

Abstract

Ethylene homopolymers and copolymers are prepared in a tube reactor at from 160° C. to 350° C. and pressures in the range from 500 to 5000 bar, with or without use of molar mass regulators, using a peroxide mixture comprising from 1 to 95 mol %, based on the total amount of the peroxide mixture, of at least one cyclic peroxide of the formula I, where the radicals R are identical or different and are selected from among alkyl groups and aryl groups, as polymerization initiator.