Patent ID: 6562926
Filing Date: 2003-05-13
Classification: C08F,D21H

Abstract:
A process for preparing water-soluble copolymers having oligoalkyleneimine side chains of formula I, where is a linear or branched oligoalkyleneimine chain comprising m alkyleneimine units, where m is an integer from 1 to 20, and the number average of m in the oligoalkyleneimine side chains is at least 1.5, Y is the anion equivalent of a mineral acid, and x is 0&lE;x&lE;m, â€ƒwhich comprises copolymerizing ethylenically unsaturated monomers M, comprising: from 5 to 50% by weight of at least one monomer A of formula II or an oligomer mixture thereof â€ƒwhere m and Y are as defined above, R is hydrogen or C1-C4-alkyl, and n is 1&lE;n&lE;m; and from 50 to 95% by weight of at least one neutral or cationic, water-soluble monomer B which is monoethylenically unsaturated, and up to 10% of one or more monomer C which are different from said monomers A and said water-soluble, monoethylenically unsaturated monomers B, in an aqueous polymerization medium in the presence of an initiator which triggers the free-radical polymerization of the monomers M.