A process for obtaining caprolactam from mixtures of caprolactam-containing polymers and polyurethane-containing polymers, in particular polyurethane block copolymers, by depolymerization, wherein the depolymerization of the mixture is performed in the presence of 0.05% to 5% by weight of a base at a temperature of 250° C. to 350° C. and a pressure of 5 to 700 mbar and wherein the caprolactam is obtained in gaseous form.