Preparation of copolymers of ethylene with vinyl esters in a tubular reactor at above 500 bar

US4794004A · 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

Key dates

• Filing date: Apr 22, 1987
• Grant date: Dec 27, 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 vinyl esters are prepared in a continuously operated tubular polymerization system at high pressure and temperatures by feeding a mixture of ethylene, vinyl ester, initiator and, if appropriate, regulant into the polymerization system in the form of a mainstream at the inlet point thereof and at the same time through two or more secondary streams downstream of the inlet point, 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.