The invention relates to modified comb copolymers comprising special structural units, produced by reacting SMA resins and optionally special copolymers having an AB block copolymer structure with a mixture consisting of at least one polyalkylene oxide monoamine and at least one amino alcohol, a mixture of at least one polyalkylene oxide monoamine and at least one N,N-disubstituted diamine or a mixture of at least one polyalkylene oxide monoamine, at least one N,N-disubstituted diamine and at least one polymer selected from the group consisting of monohydroxy-terminated polyalkylene oxides, monohydroxy-terminated polyesters and monohydroxy-terminated block copolymers consisting of polyalkylene oxide blocks and polyester blocks. The invention also relates to the subsequent reaction of the monohydroxy-terminated side chains of said comb copolymers to form phosphoric acid esters and to the reaction of the N,N-disubstituted amino-terminated side chains of said copolymers to form quaternary ammonium salts. The invention further relates to the use of the copolymers as wetting agents or dispersants.