Method for producing ethylene polymers in a high-pressure process

US6815571B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Lars Wittkowski · Mannheim, DE
• Andreas Deckers · Flomborn, DE
• Wilhelm Weber · Neustadt, DE
• Thomas Dröge · Neustadt, DE
• Andrei Gonioukh · Liblar, DE
• Frank-Olaf Mähling · Mannheim, DE

Key dates

• Filing date: Jul 23, 2003
• Grant date: Nov 9, 2004
• Expiry date: Jul 23, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S585/946
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A process for preparing ethylene polymers by the high-pressure method comprises dissolving one or more free-radical initiators in one or more ketones of the formula I where R1 and R2 are identical or different and are selected from among C1-C6-alkyl and C3-C12-cycloalkyl and R1 and R2 may also be covalently linked to one another to form a 4- to 13-membered ring, prior to the polymerization,compressing the solution, metering it into the polymerization reactor at one or more points and subsequently carrying out the polymerization at from 150 to 380° C. and from 500 to 4500 bar.