Process for the admixture of additives into plastics with simultaneous removal of volatile constituents

US4065532A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Jakob Wild · Wolfhausen, CH
• Guenter Jeckel
• Adolf Echte · Ludwigshafen, DE
• Johann Zizlsperger
• Rudi W. Reffert · Beindersheim, DE
• Gunter Thielen

Key dates

• Filing date: Apr 3, 1975
• Grant date: Dec 27, 1977
• Expiry date: Apr 3, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S425/812
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for admixing additives to plastics and simultaneously removing volatile constituents in a horizontal devolatilizing extruder. Taken in sequence in the direction of flow, the additives are first introduced into the devolatilizing extruder from above, and the plastic melt, solution or dispersion is then introduced from below, while the bulk of the volatile constituents are withdrawn from the devolatilizing extruder at an orifice located vertically above the point at which the plastic is fed in. The process permits the removal of volatile constituents with simultaneous admixture of additives during aftertreatment of plastics, in a single step and at very high throughputs.