Process for the continuous drying of polymers containing N or amino, ammonium or spirobicyclic ammonium groups

US7057010B2 · kind B2 · utility

Assignee

• DSM Fine Chemcials NFG GmbH & Co KG · AT

Inventors

• Michael Stanek · San Clemente, US
• Georg Häubl · Linz, AT
• Walter Raml · Linz, AT
• Erich Steinwender · Linz, AT

Key dates

• Filing date: Jan 15, 2004
• Grant date: Jun 6, 2006
• Expiry date: Jan 15, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F6/008
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for the drying of polymers containing N or amino, ammonium or spirobicyclic ammonium groups, comprising cationic N-containing groups, and suitable counterions, in which the gelled and washed polymers obtained by polymerization, crosslinkage and optionally alkylation are dried continuously using a gaseous medium under normal pressure or overpressure in a fluidized bed.