Evonik Degussa Gmbh

Degussa Aktiengesellschaft

Degussa - Huls Ag

Evonik Operations Gmbh

United Initiatiors Gmbh & Co. Kg

United Initiators Gmbh & Co. Kg

Stipan Katusic

Peter Kress

Michael Kraemer

Edwin Staab

Harald Herzog

Guido Zimmermann

Stefan Heberer

Michael Kroell

Helmut Mangold

Günther Michael

Hauke Jacobsen

Werner Hartmann

Klaus Deller

Jürgen Meyer

Rainer Golchert

Guenther Michael

Harald Alff

Peter Albers

Thomas Hasskerl

Wolfgang Lortz

Juergen Meyer

Kai Schumacher

Andreas Gutsch

Karl-Anton Starz

Birgit Bertsch-Frank

Horst Miess

Ralph Brandes

Armin Wiegand

Andreas Schulz

Karlheinz Janzon

Jorg Sperlich

Michael Kröll

Konrad Rockstein

Monika Oswald

Friedrich Georg Schmidt

Ghirmay Seyoum

Martin Moerters

Ina Hemme

Rolf Neeb

Aristidis Ioannidis

Rainer Hahn

Matthias Rochnia

Norbert Giesecke

Martin Kunz

Michael Hagemann

Iris Nagl

Roland Schilling

Geoffrey J Varga

Hanno Wolf

Jutta Zimmermann

Tobias Renger

Thomas Hennig

J&uuml;rgen Rollmann

Andrea Tietze

Michael Krämer

Winfried Weber

Patrick Becker

Susanne Reinhart

Sven Hill

Lukas Von Hoppel

Witold Katerinak

Stefan Fiedler

Ronald Ihmig

Hark-Oluf Asbahr

Markus PRIDÖHL

Martin Mörters

Peter Kreß

Meike Pelz

A process for producing a metal oxide powder by flame spray pyrolysis where

Method for producing metal oxides by means of spray pyrolysis

Process for producing metal oxide powders by means of flame spray pyrolysis, in which an aerosol comprising a metal compound is introduced into a flame in a reactor and reacted therein, and the metal oxide powder obtained is separated from gaseous substances, wherein a) the flame is formed by the ignition of an oxygen-containing gas (1) with a fuel gas, b) the aerosol is obtained by joint atomization of a solution containing a metal compound and an atomization gas by means of one or more nozzles and c) the ratio of the spray area to the cross-sectional reactor area is at least 0.2.

Process for producing metal oxide powders by means of flame spray pyrolysis

Core-shell particles containing crystalline iron oxide in the core and amorphous silicon dioxide in the shell and in which

Iron-silicon oxide particles having an improved heating rate

Provided is a composite material which is in pellet form and which has particles with a core-shell structure, where the core of the particles has one or more magnetic materials, and the shell is made of silicon dioxide, and the pellet has one or more crosslinkable polyethylene and/or polyethylene-containing copolymers. Also provided is a process for crosslinking polyethylenes, by mixing the composite material, one or more free radical initiators, and at least one polyethylene, and heating the mixture inductively.

Composite material comprising polyethylene and magnetic particles

Iron-silicon oxide particles with a core and an outer shell have improved heating rates in a magnetic field. The core contains maghemite, magnetite, and haematite. The outer shell is essentially or exclusively silicon dioxide. The crystallite diameter of the haematite determined by X-ray diffraction is greater than 120 nm. A ratio of the brightness of the Debye-Scherrer diffraction ring by electron diffraction at a lattice plane spacing of 0.20+/&#x2212;0.02 nm, comprising maghemite and magnetite, to the brightness of the Debye-Scherrer diffraction ring by electron diffraction at a lattice plane spacing of 0.25+/&#x2212;0.02 nm, comprising maghemite, magnetite and haematite, is no more than 0.2.

Iron-silicon oxide particles having an improved heating rate in an alternating magnetic and electromagnetic field

Composite material comprising&#x2014;one or more heat-activatable free-radical initiators selected from the group consisting of organic peroxides and/or initiators having labile carbon-carbon bonds and particles which have a core-shell structure and the core of which comprises one or more magnetic materials, while the shell comprises silicon dioxide.

Heat-activatable free-radical initiators and composite material which comprises magnetic particles

Iron-silicon oxide particles with a core-shell structure, which have a) a BET-surface area of 10 to 80 m/g, b) a thickness of the shell of 2 to 30 nm and c) a content of iron oxide of 60 to 90% by weight, of silicon dioxide of 10 to 40% by weight, based in each case on the enveloped particles, where d) the proportion of iron, silicon and oxygen is at least 99% by weight, based on the enveloped particles, and where e) the core is crystalline and the iron oxides comprise haematite, magnetite and maghemite, f) the shell consists of amorphous silicon dioxide and g) at least one compound or a plurality of compounds consisting of the elements silicon, iron and oxygen is/are present between shell and core.

Iron-silicon oxide particles with a core-shell structure

Fumed silicon dioxide powder with a BET surface area of 20 to 35 m/g, characterized in that a) the number-based median particle diameter is 60 to 150 nm, and b) the proportion of particles with a diameter of 200 nm or more is at most 10%, and c) the proportion of particles with a diameter of up to 60 nm is at most 20%, based in each case on the total number of particles.

Low-surface area fumed silicon dioxide powder

Process for preparing a mixed metal oxide powder, in which oxidizable starting materials are evaporated and oxidized, the reaction mixture is cooled after the reaction and the pulverulent solids are removed from gaseous substances, wherein as starting materials, at least one pulverulent metal and at least one metal compound, the metal and the metal component of the metal compound being different and the proportion of metal being at least 80% by weight based on the sum of metal and metal component from metal compound, together with one or more combustion gases, are fed to an evaporation zone of a reactor, where metal and metal compound are evaporated completely under nonoxidizing conditions, subsequently, the mixture flowing out of the evaporation zone is reacted in the oxidation zone of this reactor with a stream of a supplied oxygen-containing gas whose oxygen content is at least sufficient to oxidize the starting materials and combustion gases completely.

Process for preparing mixed metal oxide powders

Aqueous cerium oxide dispersion Aqueous cerium oxide dispersion, containing 5 to 60% by weight cerium oxide. It can be used to polish SiOin the semiconductor industry.

Aqueous cerium oxide dispersion

Process for the production of a metal oxide powder having a BET surface area of at least 20 m/g by reacting an aerosol with oxygen in a reaction space at a reaction temperature of more than 700&#xb0; C. and then separating the resulting powder from gaseous substances in the reaction space, wherein

Process for the production of metal oxide powders

Mixed oxide powder consisting of particles with the components zirconium dioxide, aluminium oxide and at least a third component selected from the group including yttrium oxide, magnesium oxide or calcium oxide, wherein mixed oxide powder has an aluminium oxide content 0.01 to 10 wt. % and is homogeneously distributed in the mixed oxide particles, the content of aluminium oxide, zirconium dioxide and yttrium oxide is at least 99.5 wt. %, based on the total quantity of the powder, and the BET surface area is 20 to 80 m2/g. It is obtained by atomising a solution containing at least one starting compound for each of aluminium oxide, zirconium dioxide and the third component, allowing the atomised solution to react with oxygen in a reaction chamber at a reaction temperature 700 to 15000&#xb0; C., cooling the hot gases and the solid products and then separating the solid product from the gases. It can be used as a dental material.

Stabilised aluminium zirconium mixed oxide powder

Nanoscale, pyrogenically produced zinc oxide having a BET surface area of 10 to 200 m/g, which is in the form of aggregates of anisotropic primary particles and whereby the aggregates display an average diameter of 50 to 300 nm. It is obtained from zinc powder, which is converted to zinc oxide powder in the four successive reaction zones, evaporation zone, nucleation zone, oxidation zone and quench zone. It can be used in sunscreen formulations.

Nanoscale zinc oxide, process for its production and use

A process is described for producing mouldings from plastics by coating a moulding on one or more sides with a lacquer system, the lacquer system being composed of a binder or a binder mixture, optionally a solvent or solvent mixture, optionally other additives usual in lacquer systems and optionally a thickener, and use can be made here of polymeric thickeners at from 0 to 20% content and oligomeric thickeners at from 0 to 40% content, in each case based on dry film (components a, c, d, e), from 5 to 500 parts by weight, based on a), of an electrically conductive metal oxide powder with a median primary particle size of from 1 to 80 nm and a percentage degree of aggregation of from 0.01 to 99%, from 5 to 500 parts by weight, based on a), of inert nanoparticles coated [sic] in a manner known per se and the lacquer cured.

Method for the production of anti-statically coated moulded body

Cerium oxide powder having carbonate groups and made of crystalline primary particles containing cerium oxide and having carbonate groups on the surface and in a region close to the surface, and having a BET surface area of from 25 to 150 m/g, a mean diameter of from 5 to 50 nm, a carbonate concentration in the region close to the surface decreasing inwardly from the surface, a carbon content due to carbonate groups on the surface of from 5 to 50% by area, a carbon content due to carbonate groups at a depth of about 5 nm in a region close to the surface of from 0 to 30% by area, a content of cerium oxide calculated as CeOand based on the powder of at least 99.5% by weight and a content of organic and inorganic carbon of from 0.01 to 0.3% by weight. A dispersion containing this powder.

Cerium oxide powder and cerium oxide dispersion

Growing community of inventors

Bad Soden, Germany

Stipan Katusic