Process for producing polymer mixtures comprising at least one polymer (A) and comprising at least one component (B), comprising the following steps: (a) providing (A) in the form of granules, (b) providing (B) in the form of liquid solution and/or dispersion in a dispersion medium, (c) by means of an atomizer, applying droplets of the solution and/or dispersion provided in step (b) to the granules provided in step (a), (d) drying the granules obtained in step (c), and (e) optionally carrying out one or more shaping steps.