Ticona Gmbh

Satyajit Verma

Michael G Yearwood

Karl-Friedrich Muck

Robert M Gronner

Michael Hoffmockel

Horst Röschert

Karl-Friedrich Mück

Gerhard Reuschel

Peter Eckardt

A process for the preparation of polyoxymethylene copolymers, wherein 1,3,5-trioxane is polymerized with generally known comonomers in the presence of a strong protonic acid initiator and in the presence of a formaldehyde dialkyl acetal, and wherein the initiator is dissolved in the formaldehyde dialkyl acetal before admixing to the trioxane and the comonomers.

Process for the preparation of thermally stable polyoxymethylene copolymers

Process for the preparation of thermally stable polyoxymethylene

A continuous process for the preparation of polyacetal copolymers from 1,3,5-trioxane and the comonomers known for this purpose using strong protic acids as an initiator, in which the initiator is added in an amount of 0.01 to 0.6 ppm, based on the total amount of monomers, in finely divided form to the monomer mixture, after the polymerization step the crude polymer is transferred from the polymerization reactor to a mixing unit without further intermediate steps, excess monomer is removed from the crude polymer in the mixing unit or between polymerization reactor and mixing unit by applying reduced pressure and, if desired, generally customary stabilizers, assistants, fillers, reinforcing materials and/or colorants are incorporated into the polymer in the mixing unit.

Process for the preparation of polyacetal copolymers

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Nueces, TX, United States of America

Satyajit Verma