GRAFT POLYMERS CONTAINING N-VINYL UNITS, PROCESS FOR THEIR PRODUCTION AND THEIR USE

摘要

Graft polymers which contain N-vinyl units and in which the grafting base is a polymer which contains in each case at least % by weight of units of the formulae (see formulae I and II) where R1 and R2 are each H or C1-C6-alkyl, monoethylenically un-saturated monomers are grafted onto the grafting base in a weight ratio of from 100:1 to 1:100, and which have K values of at least 7 (determined according to H. Fikentscher in 5 % strength by weight aqueous solution at 25.degree.C and pH 7), are prepared by poly-merization of monoethylenically unsaturated monomers in the pres-ence of polymers which in each case contain at least 5 % by weight of units of the formulae I and/or II as the grafting base in a weight ratio of from 100:1 to 1:100, and are used as disper-sants for pigments, as additives for detergents and cleaning agents, and strength agents for paper and as soil stabilizers and for fertilizer compaction.