The present invention relates to a process for making a copolymer, wherein the copolymer comprises hydrophilic and/or hydrophobic monomers, comprising copolymerization of the monomers in a one-step process in a cosmetic suitable oil in the presence of common emulsifiers so that a dispersion of the copolymer in the oil is obtained. Furthermore, the present invention relates to the products obtainable by this process.