Patents Assigned to Degussa AG
  • Patent number: 8911638
    Abstract: Stable, pourable silicon dioxide dispersion, in which the average, number-related aggregate diameter of the silicon dioxide particles in dispersion is less than 200 nm, and which comprises at least 35 wt. % of a silicon dioxide powder, 3 to 35 wt. % of at least one polyol, 20 to 60 wt. % of water, 0 to 10 wt. % of an additive and a substance having an alkaline action in an amount such that a pH of 10<pH<12 is established. It can be prepared by a procedure in which silicon dioxide powder is introduced into water and a polyol in a rotor/stator machine, the pH being less than 5, and the mixture is dispersed until the current uptake of the rotor/stator machine is largely constant, and a substance having an alkaline action is subsequently added in an amount such that a pH of the dispersion of 10<pH<12 results, the substance having an alkaline reaction being added so rapidly that no gel formation takes place.
    Type: Grant
    Filed: June 16, 2005
    Date of Patent: December 16, 2014
    Assignee: Degussa AG
    Inventors: Wolfgang Lortz, Christoph Batz-Sohn, Helmut Mangold, Gabriele Perlet, Werner Will, Sascha Reitz
  • Patent number: 8449812
    Abstract: A process for the production of a titanium silicalite shaped article by: a) preparation of a synthesis gel containing a Si2 source, a Ti2 source, a template compound and water, b) crystallization of the synthesis gel under hydrothermal conditions, c) drying of the titanium silicalite from step b) at a temperature below the decomposition temperature of the template compound, d) preparation of a formable mass containing the product from step c), a binder and a paste-forming agent, e) forming of the mass from step d) into a green shaped article, f) optionally drying, and g) calcinations of the green shaped article, as well as a titanium silicalite shaped article obtainable according to this process, and the use of this shaped article as a catalyst in epoxidation or ammoximation reactions.
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: May 28, 2013
    Assignee: Evonik Degussa AG
    Inventors: Steffen Hasenzahl, Ralf Jantke
  • Patent number: 8252555
    Abstract: The present invention relates to nucleotide sequences encoding enzymatically active cobalamin-methionine synthase and functional fragments thereof that are modified in comparison to the respective wild-type enzyme such that said enzymes show reduced product inhibition by methionine. The present invention also relates to polypeptides being encoded by such nucleotide sequences and host cells comprising such nucleotide sequences. Furthermore, the present invention relates to methods for producing methionine in host organisms by making use of such nucleotide sequences.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: August 28, 2012
    Assignee: Evonik Degussa AG
    Inventors: Oskar Zelder, Wolfgang Grabarse, Corinna Klopprogge, Hartwig Schröder, Stefan Haefner, Anja Knietsch, Andrea Herold
  • Publication number: 20110244209
    Abstract: A polyamide molding composition which can be used for production of a printable or printed item contains a) at most 90 parts by weight of a polyamide obtained from a lactam or from an amino carboxylic acid having at least 10 carbon atoms; and b) from 10 to 100 parts by weight of PA1010, wherein a total of components a) and b) is 100 parts by weight.
    Type: Application
    Filed: June 1, 2011
    Publication date: October 6, 2011
    Applicant: DEGUSSA AG
    Inventors: Kirsten Luetzeler, Franz-Erich Baumann, Sonja Bollmann, Andreas Dowe, Roland Wursche, Georg SCHÄFER
  • Publication number: 20110206971
    Abstract: The present invention relates to flexible ceramic membranes which, depending on embodiment, are useful as separators for batteries, especially lithium batteries, and also a process for their production. Ceramic or hybridic membranes have the disadvantage that, whatever the level of flexibility already achieved, they tend to crumble off the ceramic coating on bending. This is prevented by the present membranes, which comprise, on and in a polymeric nonwoven, a solidified ceramic coating which is constructed from two fractions of metal oxide particles of different size and which adheres to the polymeric nonwoven through a network constructed by two different adhesion promoters.
    Type: Application
    Filed: May 3, 2011
    Publication date: August 25, 2011
    Applicant: DEGUSSA AG
    Inventors: Volker HENNIGE, Christian Hying, Gerhard Hoerpel
  • Patent number: 7960061
    Abstract: The invention relates to an electrolyte composition consisting of an ionic liquid, a conducting salt, a film former and a viscosity modifier and also to the use of the electrolyte composition of the present invention as an electrolyte material for electrochemical energy storage systems, especially for lithium-metal and lithium-ion batteries.
    Type: Grant
    Filed: February 24, 2005
    Date of Patent: June 14, 2011
    Assignee: Degussa AG
    Inventors: Carsten Jost, Michael Holzapfel, Petr Novak, Anna Prodi-Schwab, Volker Hennige, Christian Hying
  • Publication number: 20110136400
    Abstract: The present invention relates to a vapor-pervious water-impervious substrate, preferably a fibrous nonwoven web, which can be used in particular as a textile continuous sheet material, for example as an awning or as an inlet in apparel. The substrate according to the present invention may have self-cleaning properties. The substrate according to the present invention is simple to produce in an at least two-step process wherein a coating on the fibers of the substrate is produced in the first step and then hydrophobic particles are applied to the coated fibers by means of an adhesion promoter.
    Type: Application
    Filed: November 3, 2010
    Publication date: June 9, 2011
    Applicant: DEGUSSA AG
    Inventors: Volker HENNIGE, Christian HYING, Gerhard HÖRPEL, Markus OLES, Edwin NUN, Bernhard SCHLEICH
  • Publication number: 20110130515
    Abstract: A molding produced by a layer-by layer process of selectively melting regions of a respective pulverulent layer via unfocused introduction of electromagnetic energy, using a polymer powder, where the powder has at least one thermoplastic random copolymer with an ISO 1133 MFR value of from 12 to 1 g/10 min.
    Type: Application
    Filed: February 10, 2011
    Publication date: June 2, 2011
    Applicant: DEGUSSA AG
    Inventors: Sylvia MONSHEIMER, Franz-Erich Baumann, Maik Grebe, Eva Von Der Bey
  • Publication number: 20100324190
    Abstract: A pulverulent composition that is a powder containing at least one polymer, and at least one flame retardant that contains ammonium polyphosphate, the powder having a maximum particle size of ?150 ?m and a median particle size of from 20 to 100 ?m.
    Type: Application
    Filed: August 10, 2010
    Publication date: December 23, 2010
    Applicant: Degussa AG
    Inventors: Sylvia MONSHEIMER, Maik GREBE, Franz-Erich BAUMANN
  • Publication number: 20100288164
    Abstract: Highly efficient matting agents based on precipitated silicas and wax-coated precipitated silicas, their preparation, and their use in inks and paints.
    Type: Application
    Filed: July 8, 2010
    Publication date: November 18, 2010
    Applicant: DEGUSSA AG
    Inventors: Juergen SCHUBERT, Robert Kuhlmann, Hans Dieter Christian
  • Patent number: 7795339
    Abstract: The present invention relates to a powder which, in addition to a polymer, comprises a flame retardant based on ammonium polyphosphate, to the use of this powder for the layer-by-layer production of moldings, and also to moldings produced from this powder. The moldings constructed using the inventive powder have marked advantages with regard to their flammability, when comparison is made with conventional products, and this permits use in aircraft, for example.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: September 14, 2010
    Assignee: Degussa AG
    Inventors: Sylvia Monsheimer, Maik Grebe, Franz-Erich Baumann
  • Publication number: 20100221544
    Abstract: Nanoscale silicon particles, essentially hydrogen terminated nanoscale silicon particles, essentially alkyl terminated nanoscale silicon particles, partially alkyl terminated nanoscale silicon particles, methods for producing the particles, and methods for forming electrical components, electronic circuits, and electrochemically active fillers with the particles.
    Type: Application
    Filed: August 17, 2006
    Publication date: September 2, 2010
    Applicant: Degussa AG
    Inventors: Andrea Baumer, Martin S. Brandt, Martin Stutzmann, Hartmut Wiggers
  • Patent number: 7767772
    Abstract: Spherical particles comprising magnesium alcoholate and having a poured cone height of less than 17 mm are prepared by reacting magnesium, an alcohol or a mixture of various alcohols and a halogen and/or an optionally organic halogen compound with one another at below the boiling point of the alcohols. The spherical particles are employed as a precursor for olefin polymerization catalysts.
    Type: Grant
    Filed: November 3, 2004
    Date of Patent: August 3, 2010
    Assignee: Degussa AG
    Inventors: Michael Grün, Klaus Heyne, Claudine Mollenkopf, Sam Lee, Roger Uhrhammer
  • Patent number: 7728167
    Abstract: The present invention is concerned with the resolution of a mixture of enantiomers of N-protected amino acids by crystallization with enantiomerically pure N-unprotected ?-amino acid derivatives.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: June 1, 2010
    Assignee: Degussa AG
    Inventors: Rolf Hoffmann, Michael Kraft
  • Patent number: 7722740
    Abstract: A modular construction micro-reactor with parallel microchannels on fluid guide plates for chemical reactions, but not for evaporation purposes is known. A modular construction falling film evaporator is disclosed, comprising a stack of alternate gap-like evaporation chambers and sheet-like evaporator modules with an assembly of parallel microchannels, whereby the evaporation chambers are open above and/or below across the whole width of the module and the stack is arranged in a container. The falling film evaporator is used in a method for obtaining a gaseous phase from a liquid medium on a technical scale and is suitable for the concentration of thermolabile solutions and rapidly adjustable production of a gas stream.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: May 25, 2010
    Assignees: UHDE GmbH, Degussa AG
    Inventors: Elias Klemm, Johannes Albrecht, Armin Lange de Oliveira, Georg Markowz, Stefan Gross, Ruediger Schuette, Johannes Ehrlich, Steffen Schirrmeister, Olaf von Morstein
  • Publication number: 20100117021
    Abstract: An aqueous dispersion for use as a finishing agent for textiles, wherein the dispersion contains a pyrogenically produced, aggregated silicon dioxide powder and a cationic polymer which is soluble in the dispersion, wherein the cationic polymer is present in a quantity such that the particles of the silicon dioxide powder exhibit a positive zeta potential.
    Type: Application
    Filed: April 28, 2005
    Publication date: May 13, 2010
    Applicant: DEGUSSA AG
    Inventors: Christoph Batz-Sohn, Wolfgang Lortz, Heinz Lach, Gabriele Perlet, Werner Will
  • Patent number: 7713581
    Abstract: The invention relates to a method for impregnating a support matrix with solid and/or liquid compounds using a compressed gas or a compressed mixture of gases at densities ranging from 0.15 to 1.3 kg/l and at least two unsymmetrical pressure changes (pulsations). The method is further characterized in that both a multitude of impregnating substances such as biologically active compounds, technical materials or metal-organic compounds, as well as support matrices of biological origin and organic or inorganic substances can be used that have large inner surfaces and/or inner surfaces that are difficult to access.
    Type: Grant
    Filed: November 9, 2006
    Date of Patent: May 11, 2010
    Assignee: Degussa AG
    Inventors: Jürgen Heidlas, Zhengfeng Zhang, Kurt Stork, Johann Wiesmüller, Martin Ober, Johann Obersteiner
  • Patent number: 7713626
    Abstract: Silanized, structurally modified silicas, characterised by vinyl groups or vinyl silyl groups fixed to the surface, hydrophobic groups such as trimethyl silyl and/or dimethyl silyl and/or monomethyl silyl additionally being fixed to the surface, having the following physico-chemical properties: BET surface area m2/g: 25-400 Average primary particle size nm: 5-50 pH: 3-10 Carbon content %: 0.1-10 DBP value %: <200 or not determinable are produced by treating silica with a surface-modifying agent, heat treating and then structurally modifying the mixture obtained. The silica can be used as a filler in silicone rubber.
    Type: Grant
    Filed: February 8, 2005
    Date of Patent: May 11, 2010
    Assignee: DeGussa AG
    Inventors: Jürgen Meyer, Mario Scholz
  • Patent number: 7704315
    Abstract: Aqueous dispersion containing a metal oxide powder with a fine fraction and a coarse fraction, in which—the metal oxide powder is silicon dioxide, aluminum oxide, titanium dioxide, zirconium dioxide, cerium oxide or a mixed oxide of two or more of the aforementioned metal oxides,—the fine fraction is present in aggregated form and has a mean aggregate diameter in the dispersion of less than 200 nm,—the coarse fraction consists of particles with a mean diameter of 1 to 20 ?m, —the ratio of fine fraction to coarse fraction is 2:98 to 30:70, and—the content of metal oxide powder is 50 to 85 wt. %, referred to the total amount of the dispersion. The aqueous dispersion is produced by a process comprising the steps:—production of a fine fraction dispersion by dispersing the pulverulent fine fraction in water by means of an energy input of at least 200 KJ/m3?, and—introducing the coarse fraction in the form of a powder into the fine fraction dispersion under dispersing conditions at a low energy input.
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: April 27, 2010
    Assignee: Degussa AG
    Inventors: Monika Oswald, Corinna Kissner, Roland Weiss, Andreas Lauer
  • Patent number: 7704586
    Abstract: The present invention relates to plastic molded bodies having two-dimensional or three-dimensional image structures produced in the interior through laser subsurface engraving. The plastic molded bodies are made of plastic materials which have a content of nanoscale metal oxides having particle sizes from 1 to 500 nm, both the plastic material and also the included metal oxide being transparent to the laser light used for producing the image structures. The plastic materials from which the molded bodies are manufactured particularly contain metal oxides having particle sizes from 5 to 100 nm at a content of 0.0001 to 0.1 weight-percent. Typical metal oxides are nanoscale indium-tin oxide or antimony-tin oxide.
    Type: Grant
    Filed: March 7, 2006
    Date of Patent: April 27, 2010
    Assignee: Degussa AG
    Inventors: Klaus-Dieter Schübel, Jürgen Kreutz, Wilhelm Wolff, Günther Ittmann, Thomas Hasskerl, Harald Häger, Ralf Richter, Wolfgang Stuber