A process for preparing homo- or copolymers Oxymethylenhomo-

According to the invention, the production of oxymethylene homo- or co-polymers from an aqueous solution of formaldehyde and polyoxymethylene glycols is achieved, whereby 1) in a separation stage, water and formaldehyde are at least partly separated out from the aqueous solution, such that a phase containing polyoxymethylene glycols is obtained, in which the molar ratio of polyoxymethylene glycols to formaldehyde is greater than 1:0.6 and 2) the polyoxymethylene glycols obtained in stage 1) are reacted in the presence of polycondensation catalysts with abstraction of water to give oxymethylene homo- or co-polymers.