Wacker-chemie Gmbh

Wacker Chemie Ag

Herbert Barthel

Mario Heinemann

Torsten Gottschalk-Gaudig

Frank Achenbach

Johann Schuster

Helmut Maginot

Volker Frey

Richard Weidner

Frank Sandmeyer

Herbert Eck

Bernd Pachaly

Uwe Scheim

August Altenbuchner

Bernard Paul Binks

Michael Stepp

Michael Dreyer

Franz Herrmann

Oliver Schaefer

Andreas Bauer

Reiner Figge

Werner Graf

Juergen Pfeiffer

Oliver Schäfer

Enno Funk

Otto Rothenaicher

Norbert Egerter

Johann Doppelberger

Christian Finger

Sabine Schreyer

Stephan Loskot

Ute Voelkel

Amro Dyab

Paul Fletcher

Franz Gr&uuml;nwald

Tommy S Horozov

Ute V&ouml;lkel

Henri Balard

Lutz Eismann

Ute Völkel

Disclosed is a flame reactor characterized in that the flame reactor comprises a reactor chamber having a volume of 1 mto 10 m, is 1 m to 10 m high, and includes a reactor nozzle for feeding the reactants.

Pyrogenic silicic acid manufactured in a small-scale production plant

Particles with a structural surface which are useful to produce abrasion resistant self-cleaning surfaces contain particulate solid particles having a superstructured overlayer of fine particles. The particles may be prepared by polymerizing a polymerizable siloxane, silane, or mixture thereof in a Pickering emulsion.

Particles with structured surface

The invention relates to water-in-oil (W/O) or oil-in-water (O/W) emulsions containing an oil phase of at least one water-insoluble constituent; an aqueous phase; pyrogenic silica at the oil-water interface, the pyrogenic silica partially silylated such that non-silylated surface silanol groups remaining are between 95% and 5% of initial silanol groups, the equivalent of 1.7 to 0.1 surface SiOH groups per nm, a surface energy gamma-s-D of 30 to 80 mJ/m, and a specific BET surface area between 30 and 500 m/g; and optionally other substances, such as pigments or preservatives. The inventive emulsions have a mean particle size of the dispersed phase, of between 0.5 &#x3bc;m and 500 &#x3bc;m, and are of low viscosity.

Particle-stabilised emulsions

Partly hydrophobic metal oxides are prepared by silylating a metal oxide with

Water-wettable silylated metal oxides

Particles having a relative viscosity or thickening effect &#x3b7;of more than 2, measured in a liquid medium having a viscosity of 1 Pas at a temperature of 25&#xb0; C. and measured at a shear gradient of 10 s. The particles can form beds having a porosity &#x3b5;&#x3e;0.5 in a dry form.

Particles having a small specific surface and a great thickening effect

A large scale process for preparing fumed silica with consistent product parameters wherein a silica precursor compound is fed to a burner at &#x2267;100 Kg/h along with a combusting gas at &#x2267;300 m/h and a combustible gas at &#x2267;100 m/h, with a nozzle gas velocity between 10 and 200 m/s, and a radially symmetrical, homogenous gas velocity and gas temperature.

Pyrogenic silica produced in a production facility with high capacity

Suspensions having good flow properties are produced by including a particulate thickener containing chemically or physically bound polymer.

Stabilized fumed silica suspensions for reinforcement of reactive resins

Suspensions of fine particles in a liquid containing a colloid-scale adhesive produce coatings and shaped articles which are both porous and robust.

Reactive silicic acid suspensions

Aqueous dispersions contain at least two chemically different particle types having a diameter on average of less than 100 &#x3bc;m. The dispersions are resistant to sedimentation and gelling for long periods of time, and can be used for many purposes, such as the polishing of optical surfaces, and in paints and adhesives.

Dispersion which contains at least 2 types of particles

Storage stable multiple emulsions of a polar phase A, a nonpolar phase B and a polar phase A, or of a nonpolar phase B, a polar phase A and a nonpolar phase B, employ particulate solids smaller than 1 &#x3bc;m to stabilize the resulting A/B/Aor B/A/Bmultiple emulsions against coalescence, with the proviso that surface-active substances are present only up to a maximum concentration of less than 0.1 times the critical micelle concentration of the surface-active substances in phase A, A, A. The multiple emulsions have numerous uses including controlled release of active substances from a dispersed phase.

Multiple emulsions

A process for preparing a metal oxide having groups of the general formula I&#x2014;O&#x2014;SiR&#x2014;CH&#x2014;Y&#x2003;&#x2003;(I)which involves reacting a solid having OH groups on the surface with silanes of the general formula IIRO&#x2014;SiR&#x2014;CH&#x2014;Y&#x2003;&#x2003;(II)where

Organofunctional surface-modified metal oxides

Surface-modified solids bearing groups of the formula ISiR&#x2014;R&#x2014;NH&#x2003;&#x2003;(I),are prepared by reacting a solid having OH groups on a surface thereof with a cyclic silazane of the general formula IIwhere

Solids surface-modified with amino groups

Silylated silica is prepared by silylating silica with an organosiloxane composed of A units of the formula (I)(RSiO)&#x2003;&#x2003;(I)and B units of the formulae (IIa-c)(RSiO), and/or&#x2003;&#x2003;(IIa)(RSiO), and/or&#x2003;&#x2003;(IIb)(SiO)&#x2003;&#x2003;(IIc),optionally having 1 or 2 attached groups &#x2014;X on Si atoms, where

Silica with homogeneous layer of silylating agent

A silylated silica having an SiOH density per nm of less than 0.6, based on the BET-method surface area (DIN 66131 and 66132), is prepared by silylating silica in a process where loading, reacting, and purifying are performed in separate steps.

Growing community of inventors

Emmerting, Germany

Herbert Barthel