Method for fractionation of water soluble or dispersible polymers containing amino groups with a broad molar mass distribution

US6706190B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Ulrich Steuerle · Heidelberg, DE
• Hartwig Voss · Bischofswerda, DE
• Jürgen Bernbach · Ludwigshafen, DE
• Jürgen Decker · Speyer, DE
• Rainer Dyllick-Brenzinger · Speyer, DE
• Klaus Lorenz · Worms, DE
• Hubert Meixner · Ludwigshafen, DE
• Martin Rubenacker · Altrip, DE

Key dates

• Filing date: Nov 13, 2001
• Grant date: Mar 16, 2004
• Expiry date: Nov 13, 2021

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H21/16
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for fractionating water-soluble or water-dispersible amino-containing synthetic polymers having a broad molar mass distribution by ultrafiltration, wherein the polymer solution or dispersion to be fractionated is fed continuously into an ultrafiltration circulation with at least one ultrafiltration unit, and retentate having a narrower molar mass distribution and permeate are discharged continuously, in such a way that the ultrafiltration circulation is essentially in a steady state, the polymers obtainable by this process and their use.