Wacker Chemie Ag

Wacker-chemie Gmbh

Wolf-Dieter Hergeth

Hans-Peter Weitzel

Bernhard Eckl

Muhammad Babar

Richard Becker

Dirk Kutschera

Mehmet Gunaltay

Heribert Wendenburg

Herbert Jekat

Josef Eisenlauer

Frank Rindfleisch

Mathias Wiedemann

Subjects of the invention are processes for preparing vinyl acetate-ethylene copolymers in the form of their aqueous dispersions or water-redispersible powders by means of radically initiated emulsion polymerization and optional subsequent drying of the resultant polymer dispersions, characterized in that the emulsion polymerization of vinyl acetate, ethylene and optionally one or more further ethylenically unsaturated monomers is carried out in the presence of one or more protective colloids in one or more Taylor reactors.

Process for preparing vinyl acetate-ethylene copolymers by emulsion polymerization

A process for preparing a polymer in the form of an aqueous dispersion or a water-redispersible powder includes free-radically initiated heterophase polymerization of one or more ethylenically unsaturated monomers and optionally subsequent drying of the polymer dispersions obtained, wherein the polymerization is performed in a jet loop reactor.

Process for producing polymers by means of emulsion or suspension polymerization in a jet loop reactor

The invention provides a process for heterophase reactions in a liquid or supercritical dispersion medium, in which the starting materials are introduced into the reaction zone of a reactor provided with one or more enrichment zones and the reaction product or unreacted starting material or both starting material and reaction product are discharged via one enrichment zone in each case, wherein a) the reaction product together with the dispersion medium is discharged from the reactor via an enrichment zone, the reaction product is separated off and the dispersion medium is, if desired in countercurrent to the reaction product/dispersion medium mixture and via an enrichment zone, returned to the reaction zone, or b) unreacted starting material together with the dispersion medium is discharged, the starting material is separated from the dispersion medium and returned directly to the reaction zone and the dispersion medium is, if desired, in countercurrent to the reaction product/dispersion medium mixture and via an enrichment zone, returned to the reaction zone, or the steps a) and b) are combined with one another.

Process for heterophase reactions in a liquid or supercritical dispersion medium

Growing community of inventors

Julbach, Germany

Wolf-Dieter Hergeth