The invention relates to one or several copolymers A), wherein the copolymers contain one or several structural units, derived from a) 19.9 to 75.9 weight percent glycerin b) 0.1 to 30 weight percent of at least one dicarboxylic acid, and c) 24 to 80 weight percent of at least one monocarboxylic acid of formula (I) R1&mdashCOOH&emsp&emsp(I), wherein R1 is (C5-C29)-alkyl (C7-C29)-alkenyl phenyl, or naphthyl, and compositions containing one or several copolymers A) and B) a water-immiscible fluid medium, containing one or several members of the group consisting of esters of monocarboxylic and dicarboxylic acids, the acid and/or alcohol component of which has at least 4 C-atoms, plant-based oils, mineral oils, and aromatic hydrocarbons are suitable for reducing the drift during the application of pesticide preparations.
