Thermomechanical degradation of polyolefins

US5631346A · kind A · utility

Assignee

• BASF SE

Inventors

• Andreas Deckers · Flomborn, DE
• Albin Berger · Bobenheim am Berg, DE
• J urgen Hofmann · Ludwigshafen, DE
• Roger Klimesch · Ransbach-Baumbach, DE
• Karl-Peter Farwerck · Worms, DE
• Hilmar Ohlig · Kaiserslautern, DE

Key dates

• Filing date: Oct 19, 1995
• Grant date: May 20, 1997
• Expiry date: Oct 19, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2810/10
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Polyolefins are thermomechanically degraded in a twin-screw extruder without a downstream degradation apparatus, at from 300.degree. to 550.degree. C. and from 1 to 100 bar and in average residence times of the reaction mixture of from 0.5 to 10 minutes, by a process in which the pressure in the twin-screw extruder is changed periodically or aperiodically with a fluctuation of from 0.5 to 30 bar. The novel process is particularly suitable for the degradation of polypropylene.