The invention relates to a method for production of concentrates of water soluble active agents wherein in a waterless method using solid active agents as starting materials the crystals of an active agent are uniformly distributed in a first organic solvent to which a dispersing agent is added the viscosity of the solution thus obtained is adjusted as applicable by a suitable auxiliary agent a polymer creator is added to the solution thus obtained in a second organic solvent as applicable wherein the viscosity of either the solution to be added or the solution to be obtained is adjusted by the addition of a suitable auxiliary agent and a crosslinking agent having at least two functional groups in a third organic solvent is given to the obtained solution wherein the viscosity of either the added or obtained solution is in turn adjusted by the addition of a suitable auxiliary agent and the polymer creator is selected from the group comprising low viscosity polymethylene polyphenylisocyanate preferably having an average NCO content of 25-35 particularly preferably 30- 32% and mixtures thereof.
