Patent ID: 6056967
Filing Date: 2000-05-02
Classification: A61K,A61Q,B01D,C08G,D21H

Abstract:
A process comprising subjecting an aqueous solution of a mixture of water-soluble, amino-containing condensates or adducts having an initial molecular weight distribution to an ultrafiltration through membranes, wherein the condensates or adducts are selected from the group consisting ofreaction products of alkylenediamines, polyalkylenepolyamines, ethyleneimine-grafted polyamidoamines and mixtures thereof with crosslinking agents having at least two functional groups,reaction products of Michael adducts of polyalkylene polyamines, polyamidoamines, ethyleneimine-grafted polyamidoamines and mixtures thereof and monoethylenically unsaturated carboxylic acids and salts, esters, amides or nitriles thereof with at least bifunctional crosslinking agents,amidated polyethyleneimines obtained by reaction of polyethyleneimines with monobasic carboxylic acids or their esters, anhydrides, acid chlorides or acid amides and, if required, reaction of the amidated polyethyleneimines with crosslinking agents having at least two functional groups,polyethyleneimines, quaternized polyethyleneimines, phosphonomethylated polyethyleneimines, alkoxylated polyethyleneimines and/or polyethyleneimines carboxymethylated by a Strecker reaction andcrosslinked alkoxylated polyethyleneimines, crosslinked, quaternized polyethyleneimines, crosslinked, phosphonomethylated polyethyleneimines and/or crosslinked polyethyleneimines carboxymethylated by a Strecker reaction,to form a lower molecular weight fraction permeate and a higher molecular weight fraction retentate, wherein from 5 to 95% by weight of the condensates or adducts are separated off as the permeate, leaving water-soluble, amino-containing condensates or adducts having a narrower molecular weight distribution than said initial molecular weight distribution in the retentate, and optionally isolating said condensates or adducts from said retentate.