Abstract: The dispersion contains(a) from 30 to 60% by weight of one or more active ingredients having a mean particle size of less than 5.mu.,(b) from 0.1 to 5% by weight of one or more water-soluble homopolymers or copolymers of a N-vinyl-lactam,(c) from 0.1 to 5% by weight of one or more anionic compounds devoid of dispersant character,(d) from 0 to 30% by weight of one or more humectants and(e) water.The active ingredient is sparingly soluble or insoluble in water.The copolymer may be derived from two or more different N-vinyl-lactams or from one or more N-vinyl-lactams and one or more other compounds copolymerizable therewith.The anionic compound or compounds is or are chosen from the group comprising water-soluble alkali metal salts or ammonium salts of aromatic monosulfonic acids, disulfonic acids and trisulfonic acids, which acids may be substituted by alkyl groups of at most 8 carbon atoms or by a cycloalkyl group of at most 6 carbon atoms.