Huels Aktiengesellschaft

Klaus Walther

Bernhard-Peter Scholz

Heinz Riemer

Herbert Schlueter

Wolfgang Holtrup

The invention provides a process for the preparation of large-particle, aqueous plastic dispersions, which permits targeted adjustment of particle size. The process comprises a system which controls the particle size and comprises the step of polymerizing a monomer in the presence of an anionic emulsifier; a substantially non-branched, nonionic, water-soluble polymer auxiliary; and alkali metal and/or ammonium ions not bonded to emulsifier. The polymer auxiliary can be prepared reproducibly with regard to its agglomerating effect.

Process for the preparation of large-particle, aqueous plastic

The emulsion polymerization of free-radical-polymerizable monomers in the presence of a branched, poly(ethylene oxide) having a molecular weight of 4,000 to 19,000 and 1 to 250 mmol of the sum of the alkali metal and ammonium ions which are not bound to the emulsifier per liter of aqueous phase provides coarse, aqueous plastic dispersions. The process allows for the effective control of the particle size in the dispersion and yields carboxylated rubber dispersions which are suitable for the production of coating materials for carpets and paper.

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Marl, Germany

Klaus Walther