Hoechst Aktiengesellschaft

Ernst Noelken

Helmut Rinno

Hans-Ullrich Huth

Process for lowering the residual monomer content in aqueous plastic dispersions based on polyvinyl esters. Preparation of vinyl ester polymers or vinyl ester copolymers containing aqueous plastic dispersions having reduced contents of undesired residual vinyl ester monomers, caused by the preparation, and, optionally, acetaldehyde from corresponding starting dispersions, such as are obtainable from ethylenically unsaturated monomers by conventional polymerization or copolymerization methods, by selective alkaline saponification of the residual vinyl ester monomers saponifiable under alkaline conditions in the dispersions and preferably simultaneous removal of the acetaldehyde and unsaponified residual vinyl ester monomers from the aqueous dispersions by distillation. Use of the plastic dispersions free from residual monomer as binders in low-emission or emission-free aqueous formulations, for example for paints, coatings, plaster mortars, adhesives, paper sizing agents, nonwoven binders, textile auxiliaries, and the like, in particular for applications in indoor areas or in closed rooms.

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Bad Soden, Germany

Ernst Noelken