Degussa Aktiengesellschaft

Hans-Joachim Holle

Gerhard Morlock

Peter Reinhard

In the suspension polymerization of (meth)acrylic acid esters or of vinyl aromatics or of mixtures of such monomers, the formation of undesired, very fine 'emulsion polymer', which reduces the yield, is reduced if the polymerization is carried out in the presence of polyvalent phosphonic acids or their alkali metal salts or ammonium salts or of alkali metal salts or ammonium salts of condensed inorganic phosphates, e.g. of Graham's salt.

Method of producing suspension polymers and improved suspension polymers

The suspension polymerization of acrylic acid esters, methacrylic acid esters and vinyl aromatics alone or in admixture with subordinate amounts of other monomers is carried out in the presence of an acrylic or methacrylic acid homo or polymerizate or its alkali metal or ammonium salts as dispersing agent with the addition of an acid ester of phosphoric acid with an alkanol having 1 to 8 carbon atoms. The size of polymerizate beads produced is influenced by this procedure.

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Rodenbach, Germany

Hans-Joachim Holle