Evonik Degussa Gmbh

Degussa Aktiengesellschaft

Gottlieb-Georg Lindner

Robert Kuhlmann

Claus-Peter Drexel

Karl Meier

Michael Kempf

Florian Paulat

Astrid Mueller

Provided is a hydrophilic precipitated silica which is well suited to use in silicone rubber formulations (RTV-1, RTV-2, HTV and LSR), particularly well suited to use in HTV silicone rubber formulations. It has a BET surface area of 185&#x2dc;260 m/g, a CTAB surface area of 100&#x2dc;160 m/g, a BET/CTAB ratio of 1.2&#x2dc;2.6, and a conductivity of &#x3c;250 &#x3bc;S/cm. Also provided are a process for producing the precipitated silica and the use of the precipitated silica for thickening and reinforcing silicone rubber formulations.

Hydrophilic silica as filler for silicone rubber formulations

The present invention provides a process for generating fine particles in a jet mill which operates at a pressure of a milling gas of less than or equal to 4 bar in abs value and a temperature of the mill of less than 100&#xb0; C., a process for simultaneous milling and surface modifications of the fine particles, a jet mill for operating the process and products obtained by the process.

Low-pressure milling process

Precipitated silica or silicates, obtainable by acid precipitation of aqueous silicate solutions while maintaining a constant alkali number of at least 1.

Silica by precipitation at constant alkali number, and its use

Silica and silicate by precipitation at constant alkali number, and its use

Foreign-atom-doped precipitated silicas having a BET surface area of more than 300 m/g and a maximum surface concentration of the foreign atoms of 0.05 mmol/m, to a process for preparing them and to the use of the resulting precipitated silicas in papermaking.

Growing community of inventors

Wesseling, Germany

Gottlieb-Georg Lindner