Rohm Gmbh Chemische Fabrik

Norbert Sutterlin

Werner Siol

Herbert Fink

Siegmund Besecke

Hubert Rauch

Gerhard Markert

Dieter Tessmer

Theodor Mager

Gunter Schroder

Willi Tilch

Karl-Heinz Jagsch

Hans-Dieter Blitz

Acrylic resin dispersions are prepared by a monomer addition process in the presence of a free-radical initiator and an emulsifier, wherein a portion of the emulsifier is dissolved in the initial aqueous phase and the remaining portion in the added monomer phase. The new process decreases the formation of coagulates, reduces the required amount of emulsifier, and allows the preparation of dispersions of resins incorporating a large proportion of units derived from water-soluble monomers, such as carboxylic acids.

Process for preparing acrylic resin dispersions

A process for the continuous preparation of aqueous plastic dispersions which comprises emulsifying one or more free-radically polymerizable monomers in an aqueous phase in the presence of an emulsifying agent, in an agitator vessel; initiating the free-radical polymerization of said monomer or monomers in said aqueous phase; and passing said aqueous emulsion of the free-radically polymerizing monomer or monomers through a tubular reactor whose internal surface comprises an (optionally fluorinated)saturated polyolefin.

Continuous emulsion polymerization process

An aqueous artificial resin dispersion, comprising an aqueous phase and a water-insoluble disperse phase formed from particles containing a copolymer formed in substantial part from a water insoluble or slightly soluble first monomer, wherein the copolymer additionally is formed from a second monomer of the formula ##STR1## wherein R represents hydrogen or methyl, R' represents hydrogen or an alkyl radical with 1 to 12 C-atoms, R' represents an alkyl radical with 7 to 20 C-atoms, and M represents a proton, an alkali metal ion, or an ammonium ion, with the proviso that the aqueous phase is free of low molecular weight, ionic emulsifying agents. Such dispersions are particularly well suited for continuous emulsion polymerization because of the highly stable monomer emulsions formed by mixtures produced according to the invention.

Aqueous artificial resin dispersions free of emulsifying agents

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Ober-Ramstadt, Germany

Norbert Sutterlin