Patents Assigned to Degussa AG
  • Polyamide powder with long-lasting, consistently good flowability
    Publication number: 20040204531
    Abstract: A composition containing from 88 to 99.99% by weight of a polyamide, a compound of a polyamide and mixtures of these, and from 0.01 to 0.25% by weight of a flow aid where the drying loss from the flow aid after 5 days of conditioning at a relative humidity of 95% is less than or equal to 1%, determined by ISO 787/2.
    Type: Application
    Filed: November 5, 2003
    Publication date: October 14, 2004
    Applicant: DEGUSSA AG
    Inventors: Franz-Erich Baumann, Sylvia Monsheimer, Maik Grebe, Wolfgang Christoph, Dirk Heinrich, Holger Renners, Heinz Scholten, Thomas Schiffer, Joachim Muegge, Johannes Chiovaro
  • Line system for fluids and gases in a fuel cell
    Publication number: 20040202908
    Abstract: A component of a line system of a fuel cell, comprises:
    Type: Application
    Filed: April 9, 2004
    Publication date: October 14, 2004
    Applicant: DEGUSSA AG
    Inventors: Guido Schmitz, Harald Hager, Hans Ries, Olivier Farges
  • Doped precipitated silica
    Patent number: 6800267
    Abstract: Aluminum-doped precipitated silicas having a BET surface area of more than 300 m2/g and aluminum distributed uniformly in the silica particles are prepared by sequentially heating a mixture of water and sodium silicate at a temperature of from 70 to 86° C. and adding sulfuric acid until half of the sodium silicate is neutralized, then aging the mixture for a time of from 30 to 120 minutes, adjusting the pH of the mixture with sulfuric acid to a range of from 3.0 to 7.0, thereby precipitating the aluminum-doped silica, filtering the aluminum-doped silica from the mixture to form a filtercake and washing the filtercake, followed by drying and/or grinding the washed filtercake. An aluminum salt solution is metered into the mixture at step a) and/or step c). The aluminum-doped precipitated silicas of the present invention may be used in coatings for paper and other media intended for ink jet printing.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: October 5, 2004
    Assignee: Degussa AG
    Inventors: Jürgen Schubert, Klaus-Dieter Hellwig, Astrid Muller
  • Catalyst and process for preparing color-reduced polyisocyanates containing isocyanurate groups
    Patent number: 6800714
    Abstract: The present invention relates to a catalyst and to a process for preparing color-reduced polyisocyanates containing isocyanurate groups.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: October 5, 2004
    Assignee: Degussa AG
    Inventors: Stephan Kohlstruk, Lutz Mindach, Michael Ewald
  • Arthrobacter D-carbamoylase and methods of preparing enantiomerically enriched D-amino acids
    Patent number: 6800464
    Abstract: The present invention relates to a new D-carbamoylase and the gene sequences which code for this from the organism Arthrobacter crystallopoietes DSM 20117. Plasmids, vectors, microorganisms, particular primers and specific possible uses of the enzymes according to the invention are also mentioned. The invention moreover describes a new process for the discovery of enzymes which can be employed in a process for the preparation of D-amino acids starting from 5′-substituted hydantoins.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: October 5, 2004
    Assignee: Degussa AG
    Inventors: Karlheinz Drauz, Oliver May, Andreas Bommarius, Christoph Syldatk, Josef Altenbuchner, Markus Werner, Martin Siemann-Herzberg
  • Epoxidized polyalkenylenes and method for their preparation
    Patent number: 6797787
    Abstract: An epoxidized polyalkenylene is prepared reacting a polyalkenylene, an aqueous solution of 15 to 90% by volume of hydrogen peroxide and a carboxylic acid having from 1 to 3 carbon atoms in the presence of a catalyst which is phosphonic acid, a derivative of phosphonic acid or a mixture thereof, without addition of an organic solvent or water, to obtain the epoxidized polyalkenylene. The epoxidized polyalkenylene has a number-average molar mass of between 500 and 50 000 g/mol and an epoxide oxygen content of between 1 and 25 percent by mass.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: September 28, 2004
    Assignee: Degussa AG
    Inventors: Peter Scholz, Bernd Ondruschka, Peter Denkinger, Werner Freitag, Martina Ortelt, Werner Andrejewski, Andreas Berlineanu
  • Process for producing SiO2-TiO2 glasses having a low coefficient of thermal expansion
    Patent number: 6796143
    Abstract: SiO2—TiO2 glasses having a low coefficient of thermal expansion are produced by a molding being produced that consists of SiO2 powder, SiO2—TiO2 powder or TiO2 powder and that contains by way of secondary component a titanium-containing component which is converted into amorphous TiO2.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: September 28, 2004
    Assignee: Degussa AG
    Inventors: Rolf Clasen, Helmut Mangold, Klaus Deller, Gerrit Schneider, Christine Wagner
  • Process for the preparation of alpha-amino acids by hydrolysis of hydantoins at elevated pressure and elevated temperature
    Patent number: 6797827
    Abstract: A process for the preparation of &agr;-amino acids by hydrolysis of hydantoins in the presence of water and at least one metallic oxide under conditions such that all the starting materials are completely dissolved in the water as a result of high pressure and high temperature and only one further phase is present in the reactor in addition to the metallic oxide phase.
    Type: Grant
    Filed: July 30, 2003
    Date of Patent: September 28, 2004
    Assignee: Degussa AG
    Inventors: Martin Körfer, Dieter Buss, Horst Weigel, Christoph Weckbecker, Hans Joachim Hasselbach, Klaus Huthmacher
  • Process for continuously preparing acetals of alpha, beta-dicarbonyl compounds
    Publication number: 20040186304
    Abstract: The present invention relates to a process for preparing acetals of &agr;,&bgr;-dicarbonyl compounds of the general formula
    Type: Application
    Filed: March 22, 2004
    Publication date: September 23, 2004
    Applicant: DEGUSSA AG
    Inventors: Johannes Ruwwe, Jutta Bruhl, Clemens Osterholt
  • Dispersions of amorphous unsaturated polyester resins based on particular Dicidol isomers
    Publication number: 20040186226
    Abstract: An aqueous dispersion based on an amorphous unsaturated polyester resin obtained by polycondensing a mixture of Dicidol isomers and one or more saturated and/or unsaturated dicarboxylic acids.
    Type: Application
    Filed: December 22, 2003
    Publication date: September 23, 2004
    Applicant: DEGUSSA AG
    Inventors: Patrick Glockner, Martina Ortelt, Werner Andrejewski, Alessandro Cerri, Lutz Mindach, Stephan Kohlstruk
  • Adhesion promoter additive comprising an unsaturated, amorphous polyester
    Patent number: 6794482
    Abstract: An adhesion promoter additive contains at least one unsaturated, amorphous polyester containing 1) an acid component comprising at least one &agr;,&bgr;-unsaturated dicarboxylic acid, and 2) an alcohol component. The alcohol component contains at least 5% of a dicidol mixture of the isomeric compounds a) 3,8-bis(hydroxymethyl)tricyclo[5.2.1.02,6]decane, b) 4,8-bis(hydroxy-methyl)-tricyclo[5.2.1.02,6]decane and c) 5,8-bis-(hydroxymethyl)tricyclo[5.2.1.02,6]decane. Each isomer is present in the dicidol mixture in a proportion of from 20 to 40% by weight. A sum of the isomeric compounds a)-c) is from 90 to 100% by weight.
    Type: Grant
    Filed: September 9, 2003
    Date of Patent: September 21, 2004
    Assignee: Degussa AG
    Inventors: Patrick Gloeckner, Alessandro Cerri, Werner Andrejewski, Giselher Franzmann, Peter Denkinger
  • Plastic molding having two or more layers and antistatic properties
    Patent number: 6793997
    Abstract: The molding of the present invention has a continuous conducting path from an inner to an outer surface, comprising: A) a skin layer on the inner and outer surface of said molding, comprising an electrically conductive plastic molding composition A comprising a first base polymer; and B) a core disposed between the skin layer on the inner and outer layer of said molding comprising a plastic molding composition B comprising a second base polymer, wherein the molding composition A differs from the molding composition B. The molding may be a connector, for example a connector used in a fuel-line system for connecting plastic pipes and other assemblies.
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: September 21, 2004
    Assignee: Degussa AG
    Inventor: Guido Schmitz
  • Raney copper
    Patent number: 6794331
    Abstract: Raney copper which is doped with at least one metal from the group comprising iron and/or noble metals is used as a catalyst in the dehydrogenation of alcohols.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: September 21, 2004
    Assignee: Degussa AG
    Inventors: Daniel Ostgard, Jorg Sauer, Andreas Freund, Monika Berweiler, Matthias Hopp, Rudolf Vanheertum, Walther Girke
  • Multilayer composite based on polyamide/polyolefin
    Patent number: 6794048
    Abstract: A multilayer composite comprising the following layers bound directly to one another: I. a layer I of a polyamide molding composition; II. a layer II of a bonding agent comprising at least 50% by weight of a mixture of a) from 30 to 70 parts by volume of polyamide and b) from 70 to 30 parts by volume of polyolefin, where the sum of the parts by volume is 100 and in addition at least some of the polyamide is present either in the form of a polyamide-polyolefin graft copolymer or as a highly branched polyamine-polyamide copolymer; III. if desired a layer III of a polyolefin molding composition, displays good adhesion between layers which remains largely intact even on prolonged contact with alcohol-containing or aqueous media at elevated temperature.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: September 21, 2004
    Assignee: Degussa AG
    Inventors: Guido Schmitz, Harald Haeger
  • Nucleotide sequences which code for the rpoB gene
    Publication number: 20040180359
    Abstract: The present invention relates to polynucleotides corresponding to the rpoB gene and which encode the &bgr;-subunit of RNA polymerase B, methods of producing L-amino acids, and methods of screening for polynucleotides which encode proteins having activity of the &bgr;-subunit of RNA polymerase B.
    Type: Application
    Filed: November 13, 2003
    Publication date: September 16, 2004
    Applicant: DEGUSSA AG
    Inventors: Bettina Moeckel, Brigitte Bathe, Thomas Hermann, Walter Pfefferle, Michael Binder
  • Laser-sintering powder with PMMI, PMMA, and/or PMMI-PMMA copolymers, process for its preparation, and moldings produced from this laser-sintering powder
    Publication number: 20040180980
    Abstract: The present invention relates to a sinter powder composed of polyamide which also comprises PMMI, PMMA, or copolymers with PMMI, in particular PMMI-PMMA copolymers, to the use of this sinter powder for laser-sintering, and also to moldings produced from this sinter powder. The moldings made from the powder of the invention have marked advantages over conventional products in their appearance and in their surface quality, especially as far as roughness and dimensional stability during selective laser sintering (SLS) are concerned. In addition, moldings produced from the sinter powder of the invention also have better mechanical properties than moldings based on conventional nylon-12 powders, in particular in terms of modulus of elasticity and tensile strength. These moldings also have a density close to that of injection moldings.
    Type: Application
    Filed: March 15, 2004
    Publication date: September 16, 2004
    Applicant: DEGUSSA AG
    Inventors: Christoph Petter, Maik Grebe, Sylvia Monsheimer, Franz-Erich Baumann
  • Process for preparing low-odor and storage-stable monomer-containing polyisocyanurates based on isophorone diisocyanate
    Publication number: 20040176562
    Abstract: Process for preparing low-odor and storage-stable monomer-containing polyisocyanurates from isophorone diisocyanate, in which the partial trimerization is carried out over a period of from 2 minutes to 30 minutes in the presence of from 0.05 to 1.
    Type: Application
    Filed: March 5, 2004
    Publication date: September 9, 2004
    Applicant: DEGUSSA AG
    Inventors: Stephan Kohlstruk, Manfred Kreczinski, Rainer Elm
  • Homobimetallic and heterobimetallic alkylidene complexes of ruthenium containing N-heterocyclic carbene ligands
    Patent number: 6787620
    Abstract: The invention relates to complexes of ruthenium of the structural formula I where X is an anionic ligand, Z is a monodentate to tridentate ligand which contains a metal and is nonionically bound to the ruthenium center, R1 and R2 are identical or different and are each hydrogen or/and a hydrocarbon group, but may also form a ring, and Ligand L is an N-heterocyclic carbene, and also to a process for preparing acyclic olefins having two or more carbon atoms or/and cyclic olefins having three or more carbon atoms and the use of at least one complex of the formula I in olefin metathesis.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: September 7, 2004
    Assignee: Degussa AG
    Inventors: Wolfgang Anton Herrmann, Florian J. Kohl, Thomas Weskamp
  • Process for the preparation of pantothenic acid by amplification of nucleotide sequences which code for the ketopantoate reductase
    Patent number: 6787334
    Abstract: The invention relates to a process for the preparation and improvement of D-pantothenic acid-producing microorganisms by amplification of nucleotide sequences which code for ketopantoate reductase, in particular the panE gene, individually or in combination with one another, and optionally additionally of the ilvC gene, the microorganisms containing these nucleotide sequences, and a process for the preparation of D-pantothenic acid comprising fermentation of these microorganisms, concentration of pantothenic acid in the medium or in the cells of the microorganisms, and isolation of the D-pantothenic acid.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: September 7, 2004
    Assignee: Degussa AG
    Inventors: Frank Elischweski, Jorn Kalinowski, Alfred Puhler, Nicole Dusch, Jurgen Dohmen, Mike Farwick, Georg Thierbach
  • Amino acid composition for hemodialysis
    Patent number: 6787039
    Abstract: The invention relates to a special amino acid mixture for hemodialysis as well as to the dialysis solution that can be prepared from the amino acid mixture. When the amino acid mixtures according to the invention are used for such purposes, the “shrinking men” phenomenon can be prevented. The present invention also relates to a hemodialysis process and apparatus. This aspect of the invention provides a closed dialysis system with a dialyzer solution containing the amino acid mixtures according to the invention.
    Type: Grant
    Filed: January 26, 2001
    Date of Patent: September 7, 2004
    Assignee: Degussa AG
    Inventors: Karlheinz Drauz, Guenter Knaup, Gerard Richet, Werner Kleophas, Adolf Gruenert