Process for isolating polycarbonates from their solutions with tube having cross sectional contrictions

US5317083A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Dieter Freitag · Krefeld, DE
• Claus Wulff · Krefeld, DE
• Wolfgang Alewelt · Krefeld, DE
• Hermann Kauth · Krefeld, DE

Key dates

• Filing date: Jul 9, 1993
• Grant date: May 31, 1994
• Expiry date: Jul 9, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/403
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for isolating polycarbonates in which a solution of polycarbonate in an organic solvent is dispersed with steam and which is characterized in that the resulting suspension of polycarbonate particles, condensed water and water/solvent vapor is subsequently dried in a tube with cross-sectional constrictions.