Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Degussa - Huls Ag

Heike Riedemann

Stefan Wieland

Thomas Tacke

Helmfried Krause

Ann Gray

Peter Panster

Helmut Mangold

Jürgen Meyer

Kai Schumacher

Steffen Hasenzahl

Andreas Freund

Emmanuel Auer

Roland Burmeister

Hauke Jacobsen

Steffen Seebald

Josef Piroth

Hans Lansink-Rotgerink

Thomas P Riedemann

Holger Pitsch

Manfred Fuchs

Hermanus Gerhardus Josef Lansink Rotgerink

Jörg Münzenberg

Frank Dieter Huenig

Harald Hoecker

Hermanus Lansink-Rotgerink

H G Lansink-Rotgerink

Thomas Riedemann

Hermanus Gerhardus Jozef Lansink Rotgerink

The invention relates to core-shell particles, the shell of which includes aggregated, hydrophobicized silicon dioxide particles, and the core of which includes a liquid phase, and in which the ratio of aggregated, hydrobicized silicon dioxide particles to the liquid phase, based on the total weight of the particles, is 2:98 to 40:60, where 60-100% by weight of glycerol is present in the liquid phase. The invention further encompasses the production of these core-shell particles and also their use for cosmetic purposes.

Core-shell particles with a high content of glycerol, their production and use

Dry liquids having a particle size distribution (cumulative undersize) are prepared by passing the liquids and a hydrophobic, pyrogenically prepared silica through a clearly defined, spatially limited shear zone in which the liquids are broken up into small droplets and are surrounded by the hydrophobic, pyrogenically prepared silica.

Dry liquids, and processes for their preparation

Pyrogenically prepared surface-modified silicon dioxide-titanium dioxide mixed oxides are prepared by spraying pyrogenically prepared silicon dioxide-titanium dioxide mixed oxides with a surface-modifying agent. The surface-modified pyrogenically prepared silicon dioxide-titanium dioxide mixed oxides can be used in sun protection formulation.

Surface-modified silicon dioxide-titanium dioxide mixed oxides

Moldings including pyrogenic mixed oxide and the use thereof

The use of modified silicon dioxide as a catalyst support in catalytic reactions under hydrothermal conditions is described. The pore structure of the supports may be stabilized against hydrothermal reaction conditions by impregnating the catalyst supports with elements of Group IVB of the Periodic Tube of Elements.

Use of catalysts based on catalyst supports containing silicon dioxide

A phosphoric acid catalyst on a shaped, inorganic support and its use for the hydration of olefins. At least 90 wt. % of the catalyst support consists of titanium dioxide and/or zirconium dioxide and has outstanding ageing stability under the hydrothermal conditions existing during hydration processes.

Phosphoric acid catalyst and its use

A process for the production of 2,2'-bis(4-hydroxyphenyl)propanes by reacting the corresponding phenols and carbonyl compounds in the presence of organopolysiloxanes containing sulphonate and mercapto groups and acting as a catalyst, consisting of units of the formula

Production of 2,2'-bis (4-hydroxyphenyl) propanes in the presence of

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Mömbris, Germany

Heike Riedemann