Preparation of copolymers of ethylene with carboxyl-containing comonomers in a 2-zone reactor under more than 500 bar

US4579918A · kind A · utility

Assignee

• BASF SE

Inventors

• Werner Metzger · Heßheim, DE
• Franz Brandstetter · Neustadt, DE
• Klaus Boettcher
• Klaus Pfleger · Wesseling, DE

Key dates

• Filing date: Feb 7, 1985
• Grant date: Apr 1, 1986
• Expiry date: Feb 7, 2005

Classification

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

Abstract

Copolymers of ethylene containing not more than 4 moles, based on 100 moles of ethylene, of copolymerized C.sub.3 -C.sub.6 -alkenecarboxylic acids are prepared in a continuously operated tubular polymerization system under high pressures and temperatures in the presence of a polymerization initiator by a process in which a mixture of ethylene, the alkenecarboxylic acid, if required a further monomer which is copolymerizable with ethylene, an initiator and, if required, a regulator is fed into the polymerization system at its entrance and at the same time at a second point downstream of the entrance, along the polymerization system, where the reaction temperature has exceeded a maximum, the amount of alkenecarboxylic acid at the entrance of the polymerization system being not more than 0.3, preferably less than 0.28, mole, based on 100 moles of ethylene, and the remainder being metered in at the second feed point.