Preparation of finely divided homopolymers and copolymers of ethene using a liquid alkane as reaction medium

US4794151A · kind A · utility

Assignee

• BASF SE

Inventors

• Rudolf Mueller-Mall · Schifferstadt, DE
• Guido Funk · Worms, DE
• Robert Bachl
• Peter Hennenberger · Freinsheim, DE
• Erich Kolk · Bad Dürkheim, DE

Key dates

• Filing date: Apr 8, 1987
• Grant date: Dec 27, 1988
• Expiry date: Apr 8, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/922
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the continuous preparation of finely divided homopolymers and copolymers of ethene by catalytic polymerization in a circular tube reactor using a liquid alkane as reaction medium in which the ethene or ethene/comonomer mixture to be polymerized is present in dissolved form and the polymer formed is present in suspended form and running the reaction mixture as a cycle stream to which the feed materials are added by bleeding in and from which the polymer formed is withdrawn by bleeding out reaction mixture, comprising (a) maintaining the mean concentration C.sub.m of polymer in the cycle stream at a value within a certain range and (b) effecting the bleeding out of reaction mixture at a point of the cycle stream at which the concentration of polymer has a value which is lower than the mean concentration C.sub.m by a distinct and definite amount.