High-pressure polymerization process for liquid ethylene copolymers

US11498986B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Martin Wendker · Ludwigshafen am Rhein, DE
• Ivette Garcia Castro · Ludwigshafen, DE
• Jan Strittmatter · Ludwigshafen am Rhein, DE
• Karolin Geyer · Mannheim, DE
• Wolfgang Grabarse · Mannheim, DE
• Markus Scherer · Lebach, DE
• Rene Koschabek · Weinheim, DE

Key dates

• Filing date: Mar 14, 2019
• Grant date: Nov 15, 2022
• Expiry date: Jun 13, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10M107/28
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a continuous high-pressure polymerization process for the preparation of a liquid ethylene copolymer which comprises in polymerized form 20 to 60 wt % of ethylene; and at least 20 wt % of an acrylate, which is selected from C1-C22 alkyl (meth)acrylate, where a monomer feed comprising the ethylene and the acrylate is polymerized in the presence of at least 2 wt % of a chain transfer agent. The invention further relates to the liquid ethylene copolymer obtainable by the polymerization process; and to a lubricant comprising the liquid ethylene copolymer obtainable by the polymerization process; and to a method for reducing friction between moving surfaces comprising the step of contacting the surfaces with the lubricant or with the ethylene copolymer.