Process for the preparation of polymerisates of vinyl aromatic compounds in a stage using double screw extruders

US6121391A · kind A · utility

Assignee

• BASF SE

Inventors

• Josef Wunsch · Schifferstadt, DE
• Jurgen Hofmann · Spalt, DE
• Thomas Kessler · Schifferstadt, DE
• David Fischer · Breunigweiler, DE

Key dates

• Filing date: Jun 2, 1998
• Grant date: Sep 19, 2000
• Expiry date: Jun 2, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F12/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polymers of vinylaromatic compounds are prepared at from -80 to 150.degree. C. in the presence of metallocene catalyst systems by a process in which polymerization is carried out in one stage with the use of a closely intermeshing twin-screw extruder having corotating screws.