High-purity polymer granules and method for the production thereof

US6720406B1 · kind B1 · utility

Assignees

• BAYER HEALTHCARE LLC · DE
• Bayer Antwerpen N.V. · BE

Inventors

• Thomas Elsner · Düsseldorf, DE
• Jürgen Heuser · Krefeld, DE
• Christian Kords · Krefeld, DE
• Steffen Kuhling · Meerbusch, DE
• Paul Viroux · Hove, BE

Key dates

• Filing date: Apr 30, 2002
• Grant date: Apr 13, 2004
• Expiry date: Jun 21, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2369/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for producing polymer pellets is disclosed. The process that is particular suitable for making polycarbonate pellets entails extruding a polymer melt, cooling the extrudate by contacting it with a cooling fluid and pelletizing the solidified polymer. The process is characterized in that the cooling fluid has a solids particle content of at most 10 ppm.