Manufacture of copolymers of ethylene

US4048411A · kind A · utility

Assignee

• BASF SE

Inventors

• Franz G. Mietzner · Ludwigshafen, DE
• Klaus Pfleger · Wesseling, DE
• Hans Gropper · Schifferstadt, DE
• Oskar Buechner · Dudenhofen, DE
• Klaus Boettcher
• Wieland Zacher

Key dates

• Filing date: May 19, 1976
• Grant date: Sep 13, 1977
• Expiry date: May 19, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F6/26
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the manufacture of copolymers of ethylene with vinyl acetate at pressures above 800 atmospheres and at from 150.degree. to 350.degree. C, using mean residence times of up to at most 100 seconds. The reaction mixture obtained from the polymerization is kept for from 2 to 10 minutes at from 150.degree. to 250.degree. C under a pressure below 500 atmospheres. Homogeneous ethylene/vinyl acetate copolymers are obtained without the formation of substantial amounts of free acetic acid by decomposition of the vinyl acetate.