Patent ID: 7906609

Claim:
A process for preparing polyoxymethylene copolymers (POMs), carried out without the concomitant use of a solvent, which comprises: a) polymerizing a reaction mixture comprising suitable main monomers and comonomers and also a polymerization initiator and, if appropriate, a regulator; b) adding a deactivator; and c) removing the residual monomers, wherein the amount of compounds whose melting point at 1013 hPa is below 60° C. present in the reaction mixture at any point in time during the process is not more than 0.1% by weight, with the POM, the monomers, comonomers, polymerization initiators, deactivators and regulators not being included in the calculation, and d) the initiator is added as a solution in a partial or total amount of the comonomers; and e) the deactivator and the initiator are added to the reaction mixture as a solution in a partial amount of the main monomers or the comonomers or in an oligomeric or polymeric POM.