Evonik Degussa Gmbh

Evonik Goldschmidt Corporation

Mario Loebbus

Karl Meier

Christian Panz

Roland Bergmann

Helga Obladen

Rene Allerdisse

Anja Lukas

Eberhard Esselborn

Philippe Favresse

Dirk Kuppert

Patrick Glöckner

Pedro Cavaleiro

Thomas Veit

Wolfgang Müller

Beatrix Andrea Vom Bruch

A hydrophobic precipitated silica having a BET of less than 110 m/g, a CTAB of less than 150 m/g, a BET/CTAB ratio of less than 3, a carbon content of greater than 3.1%, a pH of 9.7 to 10.5, a DBP of less than 230 g/(100 g), and a methanol wettability of more than 50%. The hydrophobic precipitated silica is used in compositions including defoamers, silicone rubber and HTV crosslinkable silicone rubber compositions. The hydrophobic precipitated silica is also useful as a flow assistant and carrier or anti-blocking agent.

Hydrophobic precipitated silica for defoamer formulations

The invention relates to dispersing resins for solids which are obtainable through the partial or complete reaction of the hydroxyl groups of carbonyl-hydrogenated ketone-aldehyde resins with one or more oxiranes and, if desired, subsequent complete or partial esterification with organic and/or inorganic acids.

Dispersing and emulsifying resins comprising polyether

Precipitated silicas with a high pH and their use in applications as defoamers having optimum silanol group density and a process for preparing precipitated silicas and to their use, particularly in defoamer formulations.

Hydrophilic precipitated silica for defoamer formulations

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Aschaffenburg, Germany

Mario Loebbus