Huels Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Walter Trautmann

Friedrich-Wilhelm Kupper

Dirk Reese

Gunter Padberg

Horst Leithaeuser

Ulrich Reichert

The invention relates to the preparation of low-viscosity aqueous dispersions of glycerol esters of long-chain fatty acids by dispersing under mechanical agitation in the aqueous phase, wherein the starting material is constituted by soap-free glycerol esters having a content of less than 2% by weight of free glycerol esters, a content is set of 0.5-6% by weight of alkali soaps of long-chain fatty acids. The dispersions are utilized for the coating of expandable finely divided styrene polymers.

Process for the preparation of low viscosity aqueous dispersion of

Impact-resistant modified styrene polymers having the characteristics: molecular weight M.sub.v 150,000 to 170,000; gel content exceeding 22%; degree of swelling of 11.5 to 13.5 and a mean gel particle diameter of 1.7 to 4.5 microns are produced by continuously polymerizing a styrene solution of polybutadiene, possibly in the presence of diluents, by means of a cascade consisting of at least three continuous stirred tank reactors, at rising temperatures and in the presence of organic peroxide initiators. The process steps are carried out as follows:

Production of impact-resistant styrene polymers

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Marl, Germany

Walter Trautmann