Patents Assigned to Degussa AG
  • Multistage continuous preparation of cycloaliphatic diisocyanates
    Patent number: 7329776
    Abstract: A multistage process for continuous and phosgene-free preparation of cycloaliphatic diisocyanates.
    Type: Grant
    Filed: August 20, 2004
    Date of Patent: February 12, 2008
    Assignee: Degussa AG
    Inventors: Stephan Kohlstruk, Manfred Kreczinski, Rainer Elm, Hans-Werner Michalczak
  • Aqueous/Organic Metal Oxide Dispersion And Coated Substrates And Mouldings Produced Therewith
    Publication number: 20080032117
    Abstract: A binder-free metal oxide dispersion with a content of metal oxide of greater than 15 wt. %, wherein the metal oxide powder in the dispersion has a number-average aggregate diameter of less than 200 nm and the dispersion comprises as the liquid phase a mixture of water and a water-miscible, organic solvent. Coated substrates and mouldings produced with the metal oxide dispersion.
    Type: Application
    Filed: June 11, 2005
    Publication date: February 7, 2008
    Applicant: Degussa AG
    Inventors: Yi Deng, Monika Oswald, Klaus Deller
  • Process for the conversion of polysulfanes
    Patent number: 7326393
    Abstract: The invention provides a process for the removal of polysulfanes from gas streams formed during H2S synthesis.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: February 5, 2008
    Assignee: Degussa AG
    Inventors: Alexander Möller, Wolfgang Böck, Wolfgang Taugner, Harald Heinzel, Stephan Rautenberg
  • Thermohardenable Epoxy Resin-Based Compositions, 3(4)-(Aminomethyl)-Cyclohexane-Propanamine and 1,4(5)-Cyclooctane Dimethanamine
    Publication number: 20080027169
    Abstract: Curable compositions based on epoxy resins and 1-aminopropyl-3(4)(aminomethyl)cyclohexane and 1,4(5)-bisaminomethylcyclooctane The invention relates to curable compositions based on epoxy resins and 1-aminopropyl-3(4)-(aminomethyl)cyclohexane and 1,4(5)-bisaminomethylcyclooctane.
    Type: Application
    Filed: March 21, 2005
    Publication date: January 31, 2008
    Applicant: DEGUSSA AG
    Inventor: Martina Ortelt
  • Polymer Compositions of Carbonyl-Hydrated Ketone-Aldehyde Resins and Polyisocyanates in Reactive Solvents
    Publication number: 20080027156
    Abstract: The invention relates to polymer compositions of carbonyl-hydrogenated ketone-aldehyde resins and polyisocyanates in reactive solvents, to a process for their preparation and to the use, particularly in radiation-curable coating materials and adhesives.
    Type: Application
    Filed: March 4, 2005
    Publication date: January 31, 2008
    Applicant: Degussa AG
    Inventors: Patrick Gloeckner, Andreas Wenning, Peter Denkinger
  • Highly Filled Polyolefin Compounds
    Publication number: 20080027161
    Abstract: The present invention relates to highly filled polyolefin compounds, the preparation of which uses maleic-anhydride-modified polyolefin and at least one amino-functional silicon compound, and to a process for their preparation, and to their use.
    Type: Application
    Filed: December 17, 2004
    Publication date: January 31, 2008
    Applicant: Degussa AG
    Inventors: Thomas Schlosser, Aristidis Ioannidis
  • Organosilicon compounds
    Patent number: 7323582
    Abstract: Organosilicon compounds of the general formula I and/or II are produced by reacting silanes of the general formula III with alcohols of the general formula R?—OH, with elimination of R—OH, wherein R—OH may be continuously separated from the reaction mixture by distillation. The organosilicon compounds may be used in rubber mixtures. Compounds, such as rubbers, produced using such organosilicon compounds.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: January 29, 2008
    Assignee: Degussa AG
    Inventors: Ulrich Deschler, Roland Krafczyk, Hans-Detlef Luginsland, Karsten Korth, Ingo Kiefer, Michael Horn
  • Process for L-amino acid production using enterobacteriaceae strain with enhanced ptsG expression
    Patent number: 7320882
    Abstract: The invention relates to a process for the preparation of L-amino acids, in particular L-threonine, which comprises overexpressing a ptsG gene coding for the glucose-specific IIBC component of the phosphotransferase system in Enterobacteriaceae.
    Type: Grant
    Filed: June 14, 2002
    Date of Patent: January 22, 2008
    Assignee: Degussa AG
    Inventor: Mechthild Rieping
  • Amino acid-producing bacteria and a process for preparing L-amino acids
    Patent number: 7319026
    Abstract: The invention relates to amino acid-producing bacteria from the family Enterobacteriaceae, in particular from the species Escherichia coli, which contain a stop codon chosen from the group amber, ochre and opal in the nucleotide sequence for the coding region of the rpoS gene and a suppressor for a stop codon chosen from the group amber suppressor, ochre suppressor and opal suppressor. This invention also relates to a process for preparing amino acids, in particular L-threonine, using these bacteria.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: January 15, 2008
    Assignee: Degussa AG
    Inventors: Mechthild Rieping, Nicole Siebelt
  • ALKYLIDENE COMPLEXES OF RUTHENIUM CONTAINING N-HETEROCYCLIC CARBENE LIGANDS; USE AS HIGHLY ACTIVE, SELECTIVE CATALYSTS FOR OLEFIN METATHESIS
    Publication number: 20080009598
    Abstract: The invention relates to a complex of ruthenium of the structural formula I, where X1 and X2 are identical or different and are each an anionic ligand, R1 and R2 are identical or different and can also contain a ring, and R1 and R2 are each hydrogen or/and a hydrocarbon group, the ligand L1 is an N-heterocyclic carbene and the ligand L2 is an uncharged electron donor, in particular an N-heterocyclic carbene or an amine, imine, phosphine, phosphate, stibine, arsine, carbonyl compound, carboxyl compound, nitrile, alcohol, ether, thiol or thioether, where R1, R2, R3 and R4 are hydrogen or/and hydrocarbon groups.
    Type: Application
    Filed: July 26, 2007
    Publication date: January 10, 2008
    Applicant: Degussa AG
    Inventors: Wolfgang Herrmann, Wolfgang Schattenmann, Thomas Weskamp
  • Polymer powder with phosphonate-based flame retardant, process for its production, and moldings produced from this polymer powder
    Patent number: 7317044
    Abstract: The present invention relates to a polymer powder composed of polyamide or of copolyamides, which also comprises flame retardant, in particular phosphonates, to a layer-by-layer process which selectively melts regions or selectively binds them, and also to moldings produced from this polymer powder. Compared with conventional products, the moldings constructed using the powder of the invention exhibit marked advantages in flammability and combustibility and drop behavior, particularly with respect to UL® (Underwriters Laboratories) classification. Furthermore, moldings produced from polymer powder of the invention have adequately good mechanical properties when compared with moldings based on polymer powders without flame retardant, in particular in terms of modulus of elasticity and tensile strain at break. In addition, these moldings also have a density close to that of injection moldings.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: January 8, 2008
    Assignee: Degussa AG
    Inventors: Sylvia Monsheimer, Maik Grebe, Franz-Erich Baumann
  • Stable Solutions of N-Substituted Aminopolysiloxanes, Their Preparation and Use
    Publication number: 20080003448
    Abstract: Stable, low-chloride solutions of hydrosalts of organic acids with cationic N substituted aminopolysiloxanes of the formula (I) in which groups R independently of each other are each benzyl or vinylbenzyl, groups Y are identical or different and Y is an alkoxy or hydroxyl group or 01/2, A is an organic carboxylic acid and 0?a<2, 0?b?1 c?0.125, 0.125?(a+b)?3 and x?2, which are present substantially in the form of T structural units in a lower alcohol. Preparation takes place from the corresponding hydrochloride salts of the cationic N-substituted aminopolysiloxanes by reaction with NaOH or Na alkoxide or with the sodium salt of the organic carboxylic acid A, precipitation and removal of the NaCl.
    Type: Application
    Filed: May 12, 2005
    Publication date: January 3, 2008
    Applicant: Degussa AG
    Inventors: Burkhard Standke, Peter Jenkner
  • Surface-Modified Zinc-Titanium Mixed Oxides
    Publication number: 20070297998
    Abstract: Surface-modified zinc-titanium mixed oxides are produced by treating zinc-titanium mixed oxides with a surface-modifying agent. They may be used for the production of sunscreen preparations.
    Type: Application
    Filed: August 24, 2005
    Publication date: December 27, 2007
    Applicant: Degussa AG
    Inventors: Jurgen Meyer, Steffen Hasenzahl, Kai Schumacher
  • Feedback Resistant Acetohydroxy Acid Synthethase Mutants
    Publication number: 20070292914
    Abstract: The present invention provides nucleotide sequences coding for acetohydroxy acid synthetase (AHAS) mutants, the mutated enzymes themselves and a process for the fermentative production of branched-chain amino acids using these enzymes in specific hosts in which genes which code for the modified acetohydroxy acid synthetase (AHAS) are expressed.
    Type: Application
    Filed: June 8, 2004
    Publication date: December 20, 2007
    Applicant: DEGUSSA AG
    Inventors: Miroslav Patek, Veronika Elisakova
  • Method for regenerating platinum catalysts
    Patent number: 7309675
    Abstract: The regeneration of platinum group metal suspension catalysts involves a dissolution step using HCl and an oxidant, such as Cl2 or H2O2, and a precipitating step carried out in the presence of a reducing agent, especially an aldehyde, an HCOOH or a formiate. According to the invention, the content of non-platinum metals which are dragged into the catalyst as a result of the method can be reduced by carrying out the precipitation in the presence of a chelate complexing agent for one or more metals selected from the series of metals of groups 2a, 3a, 4a of the periodic table and of the transition elements without elements of the platinum group.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: December 18, 2007
    Assignee: Degussa AG
    Inventors: Hermann Renner, Hans Herzog
  • Silicon-titanium mixed oxide powder
    Patent number: 7306667
    Abstract: A silicon-titanium mixed oxide powder contains aggregates of primary particles selected from amorphous silicon dioxide particles, crystalline titanium dioxide particles, and silicon-titanium mixed oxide particles each having an amorphous silicon dioxide fraction and a crystalline titanium dioxide fraction. The silicon-titanium mixed oxide particles predominate in the powder. The powder exhibits a BET surface area of from 20 to 200 m2/g, and a titanium dioxide content in a range of from greater than 10 wt. % to less than 70 wt. %. An X-ray diffractogram of the powder exhibits the diffraction patterns of rutile and anatase, with a rutile/anatase ratio of from 2:98 to 98:2. The powder can be produced by vaporizing a silicon halide and a titanium halide at temperatures of less than 180° C.
    Type: Grant
    Filed: January 7, 2005
    Date of Patent: December 11, 2007
    Assignee: Degussa AG
    Inventors: Kai Schumacher, Martin Moerters, Oswin Klotz, Uwe Diener
  • High-reactivity liquid polyurethane systems which contain uretdione groups and can be cured at a low temperature
    Patent number: 7307135
    Abstract: A high-reactivity liquid polyurethane composition which contains at least one uretdione group and cures at a low baking temperature can be used for producing plastics, particularly surface coatings and adhesives. The polyurethane composition contains A) at least one curing agent which contains at least one uretdione group and is obtained from i) an aliphatic polyisocyanate, a (cyclo)aliphatic polyisocyanate, a cycloaliphatic polyisocyanate or mixtures thereof, and ii) at least one hydroxyl-containing compound, the curing agent having a free NCO content of less than 5% by weight and a uretdione content of from 1 to 18% by weight; and B) at least one catalyst.
    Type: Grant
    Filed: October 6, 2004
    Date of Patent: December 11, 2007
    Assignee: Degussa AG
    Inventor: Emmanouil Spyrou
  • Coryneform bacteria with altered glucokinase activity in the production of L-lysine
    Patent number: 7306932
    Abstract: The invention relates to alleles of the glk gene from coryneform bacteria coding for glucokinases, and to processes for the production of L-lysine by fermentation using bacteria containing such alleles.
    Type: Grant
    Filed: November 7, 2002
    Date of Patent: December 11, 2007
    Assignee: Degussa AG
    Inventors: Brigitte Bathe, Stephan Hans, Caroline Reynen
  • Multistage continuous preparation of cycloaliphatic diisocyanates
    Patent number: 7307186
    Abstract: A process for continuous phosgene-free preparation of cycloaliphatic diisocyanates.
    Type: Grant
    Filed: August 13, 2004
    Date of Patent: December 11, 2007
    Assignee: Degussa AG
    Inventors: Stephan Kohlstruk, Manfred Kreczinski, Rainer Elm, Hans-Werner Michalczak
  • Method for producing solid highly-reactive polyurethane compositions containing uretdione groups
    Publication number: 20070282089
    Abstract: The invention relates to a process for preparing solid highly reactive polyurethane compositions which contain uretdione groups and cure at low baking temperatures, to compositions of this kind, and to their use for producing polymers, especially powder coatings, which crosslink to high-gloss or matt, light-stable and weather-stable coating films.
    Type: Application
    Filed: January 13, 2005
    Publication date: December 6, 2007
    Applicant: DEGUSSA AG
    Inventor: Emmanouil Spyrou