Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Ralf Schmoll

Christian Panz

Stefan Uhrlandt

Uwe Schachtely

Mario Scholz

Anke Blume

Michael Kempf

Peter K Kleinschmit

Peter Panster

Karl Meier

Hans-Detlef Luginsland

Claus-Peter Drexel

Oleg Stenzel

Andre Wehmeier

Helga Obladen

Arnold Storeck

Hans-Juergen Klockner

Herbert Thoma

Ralf Stoffels

Detlef Luginsland

Precipitated silicas which have a broad pore size distribution of the pores with a pore diameter smaller than that of the maximum of the derivative of the pore volume distribution function are useful, for example, for tires.

Precipitated silicas with a particular pore size distribution

The invention relates to hydrophobicized precipitated silicas that possess an extremely high whiteness and extremely low moisture absorption. The hydrophobic precipitated silicas are prepared, inter alia, by coating with silicone oil and oxidative heat treatment.

High-whiteness hydrophobic precipitated silica with ultralow moisture absorption

A hydrophobic precipitated silica is prepared by a process comprising:

Process for preparing high-whiteness hydrophobic precipitated silica with ultralow moisture absorption

A silica comprising at least two silica fractions, wherein said at least two silica fractions differ by at least 10% in at least one value for BET surface area, CTAB surface area and DBP absorption, the ranges of these three physicochemical properties being as follows: 

Inhomogeneous silicas as carrier material

The present invention provides a hydrophobic precipitated silica having the following properties: The present invention also provides methods for making and using the hydrophobic precipitated silica and articles and compositions which include the same.

High-whiteness, non-heat-treated hydrophobic precipitated silica

The invention relates to silicone rubber formulations comprising organopolysiloxanes and hydrophobicized silicas, which possess an extremely high level of whiteness.

Silicone rubber formulations with hydrophobic silicas

A silica having a high degree of dispersibility and a low dust concentration contains at least two silica fractions that differ by at least 10% in at least one value of BET or CTAB surface area or DBP absorption.

Inhomogeneous silicas for elastomer compounds

A silica comprising at least two silica fractions, wherein the at least two silica fractions differ by at least 10% in at least one of their BET surface area values, their CTAB surface area values or their DBP absorption values, the ranges of these three physicochemical properties being as follows:

Inhomogeneous silicas in dental care compositions

A process is described for the hydrided of halogen-substituted compounds of the second to fourth period of Groups III to V of the periodic system, with the exception of gallium, aluminum, carbon, or nitrogen. A finely-granulated aluminum is added to a molten salt melt that consists of 50-67 molar % AlCl.sub.3 (anhydrous) and 50 to 33 molar % of sodium chloride. Then to the stirred, or by some other means dispersed suspension, hydrogen is introduced to hydrided the finely-dispersed aluminum. Thereafter the mixture is reacted with the halogen-substituted compound and the resulting hydrided compound is renewed.

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Bonn, Germany

Ralf Schmoll