Procedure for obtaining polyoxymethylenes.

Process for preparing copolymers of polyoxymethylene (POM) by a) polymerizing a reaction mixture containing main monomers and suitable comonomers and a polymerization initiator and, if appropriate, a regulator, b) the contribution of a deactivator and c) separating residual monomers being at every moment of the process the amount of compounds whose melting point is below 60 ° c at 1,013 hPa in the reaction mixture is a maximum of 0, 1% by weight, without taking into consideration either the POM, or the monomers or comonomers, or the polymerization initiators or deactivators and regulators and time providing the deactivator and the initiator to the mixture of the dissolved reaction in a partial amount of the main monomers or the comonomers or in an oligomeric or polymeric POM.