Middle-pressure polymerization process for liquid ethylene copolymers

US11879108B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ivette Garcia Castro · Ludwigshafen, DE
• Wolfgang Grabarse · Mannheim, DE
• Jan Strittmatter · Ludwigshafen am Rhein, DE
• Rene Koschabek · Weinheim, DE
• Robert Rupaner · Ludwigshafen, DE

Key dates

• Filing date: Mar 23, 2020
• Grant date: Jan 23, 2024
• Expiry date: Sep 4, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2030/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a middle-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 mix comprising the ethylene and the acrylate is polymerized at a pressure of 50 to 400 bar and in the presence of at least 2 wt % of a chain transfer agent. The invention further relates to a 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.