W. R. Grace Co.-conn.

Merck Patent Gesellschaft MIT Beschrankter Haftung

Heiko Zeh

Jorg Ohngemach

Georg Luers

Gerd W Scheuren

A universally applicable SiO.sub.2 -flatting agent is described, which consists of SiO.sub.2, 1 to 25% by weight polyol and optionally 1 to 25% by weight wax. The novel flatting agent is, even after lengthy storage, especially at pressure, still easily dispersible, does not lead to the formation of a hard sediment with non-thixotropic paints and lacquers, and has practically no negative effect on the thixotropic behaviour of paints and lacquers based on thixotropic polyamide-modified alkyd resins. The SiO.sub.2, polyol and wax can be brought together in a variety of ways, e.g. during the micronization of the SiO.sub.2 in a jet-mill or mechanical mill by adding polyol and wax at the same time, by spray-drying a suspension of SiO.sub.2 in an aqueous polyol solution or even before drying by adding polyol during washing or an earlier production step. It is also possible to spray-dry a suspension of SiO.sub.2, wax emulsion and polyol.

SiO.sub.2 flatting agent, process for its production and its use

The invention relates to aqueous photoinitiator dispersions for incorporation into aqueous dispersions of radiation-curable binder systems.

Growing community of inventors

Weiterstadt, Germany

Heiko Zeh