Preparation of copolmers of ethylene with acrylic acid esters in a tubular reactor at above 500 bar

US4788265A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Pfleger · Wesseling, DE
• Klaus Boettcher
• Oskar Buechner · Dudenhofen, DE
• Friedrich Kanne · Wesseling, DE
• Siegfried Kursawe · Wesseling, DE
• Wieland Zacher

Key dates

• Filing date: Apr 22, 1987
• Grant date: Nov 29, 1988
• Expiry date: Apr 22, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Copolymers of ethylene with acrylates or solutions of free acrylic acid in acrylates are prepared in a continuously operated tubular polymerization system at high pressures and temperatures by feeding a mixture of ethylene, acrylate, initiator and, if appropriate, regulant into the polymerization system in the form of a main stream at the inlet point thereof and at the same time through two or more secondary streams, secondary streams (I) being metered in at points where the reaction temperature has just exceeded a maximum temperature due to the heat of polymerization and secondary streams (II) at points which, relative to the direction of flow of the ethylene, are upstream of the feed points of secondary streams (I) and upstream of the respective maximum temperature.