The present invention relates to new comb polymers, to a method for the production thereof, and to the use thereof for stabilizing water-insoluble or hardly soluble active or effective ingredients in an aqueous phase. The invention further relates to the use of the comb polymers in the production of active ingredient formulations or active ingredient preparations of water-insoluble active or effective ingredients, especially for agents for plant protection. The comb polymers can be obtained by copolymerization of monoethylenically unsaturated monomers M, wherein the monomers M comprise: a) at least one monoethylenically unsaturated monomer Ma, selected from esters of monoethylenically unsaturated C3-C8-monocarboxylic acids having C1-C20-alkanols, C5-C10-cycloalkanols, phenyl-C1-C4-alkanols or phenoxy-C1-C4-alkanols and the diesters of monoethylenically unsaturated C4-C8-dicarboxylic acids having C1-C20-alkanols, C5-C10-cycloalkanols, phenyl-C1-C4-alkanols or phenoxy-C1-C4-alkanols; and b) at least one monoethylenically unsaturated monomer Mb, selected from the esters of monoethylenically unsaturated C3-C8-monocarboxylic acids and the monoesters and diesters of monoethylenically unsaturated C4-C8-dicarboxylic acids having poly-(C2-C4-alkylene ether)ols, and wherein the total sum of the monomers Ma and Mb amounts at least to 60 wt.% of the monomers M constituting the comb polymer.