Abstract: Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b), and also, if appropriate, in the presence of regulators c), and subsequent deactivation and isolation of the polymer, which comprises undertaking the polymerization in a tubular reactor with static mixing elements and with a mixing zone, a polymerization zone, and a deactivation zone, the diameter of the tubular reactor in the mixing zone being <90% of the diameter in the polymerization zone.

Abstract: A process for removing residual monomers from polyoxymethylene homo- or copolymers, comprising the following process steps: a) the residual monomers are removed in gaseous form as vapors from the polymer in a devolatilization apparatus, b) the residual monomer vapors are removed through a vapor pipe, c) the residual monomers are condensed from the vapors in a condensation apparatus at from 1.09 to 102.4 bar and from 102 to 230° C., the temperature not falling below 102° C. at any point of the condensation apparatus, and those surfaces of the condensation apparatus which come into contact with the vapors being coated with a liquid film of condensed residual monomers.

Abstract: Thermoplastic molding compositions, comprising A) from 15 to 99.94% by weight of a polyoxymethylene homo- or copolymer B) from 0.05 to 10% by weight of a nonpolar polypropylene wax, C) from 0.01 to 5% by weight of at least one ester or amide of saturated or unsaturated aliphatic carboxylic acids having from 10 to 40 carbon atoms with saturated aliphatic alcohols or amines having from 2 to 40 carbon atoms, D) from 0 to 80% by weight of other additives, where the total of the percentages by weight of components A) to D) is always 100%.

Abstract: Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b), and also, if appropriate, in the presence of regulators c), and subsequent deactivation and isolation of the polymer, which comprises undertaking the polymerization in a tubular reactor with static mixing elements and with a mixing zone, a polymerization zone, and a deactivation zone, the diameter of the tubular reactor in the mixing zone being <90% of the diameter in the polymerization zone.

Abstract: A process for removing residual monomers from polyoxymethylene homo- or copolymers, comprising the following process steps: a) the residual monomers are removed in gaseous form as vapors from the polymer in a devolatilization apparatus, b) the residual monomer vapors are removed through a vapor pipe, c) the residual monomers are condensed from the vapors in a condensation apparatus at from 1.09 to 102.4 bar and from 102 to 230° C., the temperature not falling below 102° C. at any point of the condensation apparatus, and those surfaces of the condensation apparatus which come into contact with the vapors being coated with a liquid film of condensed residual monomers.

Abstract: Thermoplastic molding compositions, comprising A) from 15 to 99.94% by weight of a polyoxymethylene homo- or copolymer B) from 0.05 to 10% by weight of a nonpolar polypropylene wax, C) from 0.01 to 5% by weight of at least one ester or amide of saturated or unsaturated aliphatic carboxylic acids having from 10 to 40 carbon atoms with saturated aliphatic alcohols or amines having from 2 to 40 carbon atoms, D) from 0 to 80% by weight of other additives, where the total of the percentages by weight of components A) to D) is always 100%.