Process for drying polymeric powders and polymeric agglomerates

US5786445A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Claus Wulff · Krefeld, DE
• Gottfried Zaby · Leverkusen, DE
• Thomas Bamberger · Duisburg, DE
• Klemens Kohlgrüber · Lingen (Ems), DE
• Hugo Obermann · Dormagen, DE
• Stefaan De Vos · Rayong, TH
• Gabriel Denecker · Kalmthout, BE
• Johan Vaes · Kalmthout, BE
• Tony van Osselaer · Krefeld, DE

Key dates

• Filing date: Oct 2, 1996
• Grant date: Jul 28, 1998
• Expiry date: Oct 2, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29B9/06
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a process for drying polymeric powders and polymeric agglomerates, in particular thermoplastic aromatic polycarbonate or other thermoplastic polymers such as, for example, acrylonitrile-butadiene-styrene copolymer, in the melt, whereby thermoplastic polymeric powders or polymeric agglomerates containing water or solvent or both are freed from adhering moisture and contained solvent, accompanied by melting, in an apparatus provided with rotating baffles for cleaning the walls of the apparatus and for distribution and transport of the material being dried, by heat input through the walls or through the rotating baffles or both as well as by heat input as a result of shearing action. The process of drying and that of melting for the subsequent granulation are thereby combined.