Method for fractionation of water soluble or dispersible...

B - Operations – Transporting – 01 – D

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B01D 61/14 (2006.01) B01D 61/22 (2006.01) B01D 61/58 (2006.01) C08G 73/02 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2369430

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.

L'invention concerne un procédé pour le fractionnement par ultrafiltration de polymères synthétiques à large répartition de masse molaire, dispersibles ou solubles dans l'eau et contenant des groupes amino. Le procédé selon l'invention est caractérisé en ce qu'on introduit la solution ou la dispersion de polymères à fractionner en continu dans un circuit d'ultrafiltration pourvu d'au moins une unité d'ultrafiltration et qu'on retire le rétentat à répartition de masse molaire plus étroite et le perméat en continu de telle manière que le circuit d'ultrafiltration se trouve pratiquement dans un état stationnaire. L'invention concerne également les polymères obtenus selon ce procédé et leur utilisation.

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