Abstract: The invention relates to L-lysine-producing strains of corynebacteria with enhanced lysE gene (lysine export carrier gene), in which strains additional genes chosen from the group comprising the dapA gene (dihydrodipicolinate synthase gene), the lysC gene (aspartate kinase gene), the dapB gene (dihydrodipicolinate reductase gene) and the pyc gene, but especially the dapA gene and the lysC gene (aspartate kinase gene), are enhanced and, in particular, over-expressed, and to a process for the preparation of L-lysine.
Abstract: Polyaddition products containing hydroxyl and uretdione groups, a process for their preparation, their use for the production of highly reactive polyurethane (PUR) powder coatings which are free from elimination products and which crosslink to give light-stable and weather-stable coating films of high gloss, and the powder coatings produced accordingly are provided.
Abstract: The present invention relates to polynucleotides corresponding to the plsC gene and which encode 1-acyl-SN-glycerol-3-phosphate acyltransferase, methods of producing L-amino acids, and methods of screening for polynucleotides which encode proteins having 1-acyl-SN-glycerol-3-phosphate acyltransferase activity.
Type:
Application
Filed:
April 11, 2001
Publication date:
January 2, 2003
Applicant:
DEGUSSA-HUELS AKTIENGESELLSCHAFT
Inventors:
Madhavan Nampoothiri, Brigitte Bathe, Lothar Eggeling, Hermann Sahm
Abstract: The present invention relates to polynucleotides corresponding to the nadA gene and which encode the quinolinate synthetase A protein, methods of producing nicotinic acid or nicotinic acid derivatives, and methods of screening for polynucleotides which encode proteins having quinolinate synthetase A activity.
Abstract: The present invention relates to polynucleotides corresponding to the nadC gene and which encode the nicotinate nucleotide pyrophosphorylase protein, methods of producing nicotinic acid or nicotinic acid derivatives, and methods of screening for polynucleotides which encode proteins having nicotinate nucleotide pyrophosphorylase activity.
Abstract: The invention relates to a process for the preparation of 1,2,3,6-tetrahydro 2,2,6,6-tetramethylpyridine N-oxide by the catalytic oxidation of 1,2,3,6-tetrahydro-2,2,6,6-tetramethylpyridine, wherein 1,2,3,6-tetrahydro-2,2,6,6-tetramethylpyridine is oxidized with hydrogen peroxide in an aqueous medium in the presence of an alkaline earth metal salt or hydroxide as catalyst. The product is a polymerization inhibitor for monomers.
Abstract: A multilayer plastic composition having (I) an outer layer of a thermoplastic molding composition and (II) an inner layer of an electrically conductive thermoplastic molding composition containing graphite fibrils, which are useful for the transport of (petro) chemical materials and also in the motor vehicle sector for conveying brake, cooling and hydraulic fluid and also fuel.
Abstract: An apparatus for the purification of crude N,N′-diphenyl-p-phenylenediamine (DPPD) in which there is an extraction unit containing a liquid permeable container and an adsorption layer downstream of the container, a solvent evaporator downstream of the adsorption layer, a filter unit, a line for returning the filtrate to the solvent evaporator, and a condenser for returning solvent to the extraction unit.
Type:
Grant
Filed:
January 11, 2000
Date of Patent:
June 4, 2002
Assignee:
Degussa-Huels Aktiengesellschaft
Inventors:
Albert-Johannes Frings, Michael Horn, Peter Jenker, Jaroslaw Monkiewicz, Hans-Guenther Srebny, Burkhard Standke, Bertram Trautvetter
Abstract: A plastic pipe based on polyolefins is provided, which pipe, compared with single-layer pipes of polyolefins, has improved barrier action against (petro)chemical materials, in particular against methanol-containing fuels. This is achieved by a multilayer plastic pipe which comprises the following layers:
I. at least one layer based on a polyolefin,
II. at least one layer based on a thermoplastic polyester,
bonded via
III. a layer between them of a suitable coupling agent which contains reactive groups,
with adjacent layers being cohesively bonded to one another. The invention makes it possible to obtain plastic pipes having the desired improved property profile.
Abstract: Shaped Raney metal fixed-bed catalysts are doped with rhenium. Saturated or unsaturated esters are hydrogenated to their corresponding mono- or polyhydroxyalcohols.
Type:
Application
Filed:
July 17, 2001
Publication date:
March 28, 2002
Applicant:
DEGUSSA-HUELS AKTIENGESELLSCHAFT
Inventors:
Daniel Ostgard, Konrad Moebus, Monika Berweiler, Barbara Bender, Gernot Stein
Abstract: Transparent molding compositions are prepared by blending from 50 to 99 parts by weight of a transparent polyamide, and from 1 to 50 parts by weight of a graft copolymer, such that the sum of the parts by weight of the transparent polyamide and the graft copolymer is 100. The graft copolymer is prepared by reacting from 0.5 to 25% by weight, based on the graft copolymer, of a branched polyamine having at least 4 nitrogen atoms and having a number average molecular weight Mn of at least 146 g/mol, with polyamide-forming monomers selected from the group consisting of lactams, w-aminocarboxylic acids, equimolar combinations of diamine and dicarboxylic acid, and combinations thereof.
Type:
Application
Filed:
January 25, 2001
Publication date:
March 28, 2002
Applicant:
Degussa-Huels Aktiengesellschaft
Inventors:
Juergen Maul, Georg Oenbrink, Harald Haeger, Hans-Peter Hauck, Ralf Richter
Abstract: An isolated nucleic acid that encodes glycerol-3-phosphate dehydrogenase from coryneform bacteria, variants, homologs and fragments thereof. Hybridization probes and primers, vectors and host cells comprising such sequences. Coryneform bacterium with an enhanced ability to express glycerol-3-phosphate dehyrogenase. Methods of fermentative production of L-amino acids using coryneform bacteria having enhanced expression of glycerol-3-phosphate dehydrogenase.
Type:
Application
Filed:
March 2, 2001
Publication date:
March 21, 2002
Applicant:
Degussa-Huels Aktiengesellschaft
Inventors:
Madhavan Nampoothiri, Brigitte Bathe, Lothar Eggeling, Hermann Sahm
Abstract: A stable and high-solids aqueous dispersion of blocked isocyanates, containing auxiliary solvent, is prepared by (1) preparing a solution of a polyisocyanate mixture of from 20-70% by weight of a blocked, hydrophilically modified polyisocyanate (A) and from 30-80% by weight of a blocked, hydrophobic polyisocyanate (B) in an auxiliary solvent (G) and (2) adding water to this solution, with intensive mixing, in an amount which is such as to give a two-phase system comprising a disperse polyisocyanate phase and a continuous, aqueous phase containing auxiliary solvent. In a preferred embodiment of the invention dispersions are prepared which are virtually free from auxiliary solvent, by first adding a portion of water to the solution (1), substantially removing the auxiliary solvent with intensive mixing and then adding a second portion of water with intensive mixing to the mixture comprising the polyisocyanates (A) and (B) and the first portion of water.
Type:
Application
Filed:
October 19, 2001
Publication date:
February 28, 2002
Applicant:
DEGUSSA-HUELS AKTIENGESELLSCHAFT
Inventors:
Hartwig Lange, Klaus Janischewski, Dirk Reichel
Abstract: A stable and high-solids aqueous dispersion of blocked isocyanates, containing auxiliary solvent, is prepared by (1) preparing a solution of a polyisocyanate mixture of from 20-70% by weight of a blocked, hydrophilically modified polyisocyanate (A) and from 30-80% by weight of a blocked, hydrophobic polyisocyanate (B) in an auxiliary solvent (G) and (2) adding water to this solution, with intensive mixing, in an amount which is such as to give a two-phase system comprising a disperse polyisocyanate phase and a continuous, aqueous phase containing auxiliary solvent. In a preferred embodiment of the invention dispersions are prepared which are virtually free from auxiliary solvent, by first adding a portion of water to the solution (1), substantially removing the auxiliary solvent with intensive mixing and then adding a second portion of water with intensive mixing to the mixture comprising the polyisocyanates (A) and (B) and the first portion of water.
Type:
Grant
Filed:
May 10, 2000
Date of Patent:
February 19, 2002
Assignee:
Degussa-Huels Aktiengesellschaft
Inventors:
Hartwig Lange, Klaus Janischewski, Dirk Reichel
Abstract: The first embodiment of the present invention provides a process, which includes:
Type:
Application
Filed:
January 24, 2001
Publication date:
February 7, 2002
Applicant:
Degussa-Huels Aktiengesellschaft
Inventors:
Stephan Laue, Andreas Liese, Christian Wandrey, Olaf Burkhardt, Jens Woeltinger, Andreas Bommarius, Karlheinz Drauz, Jean-Louis Philippe, Hans Henniges, Adreas Karau
Abstract: A thermoplastic composite having a multiplicity of layers and comprising:
I) a layer of a polyamide molding composition,
II) a layer of a polyester molding composition, and
III) a layer of an adhesion promoter adherent to I and II comprising at least 50% by weight of a blend of:
a) from 20 to 80% by weight of a polyamide, prepared from
&agr;) at least one diamine having from 6 to 12 carbon atoms, and
&bgr;) an essentially stoichiometrically equivalent amount of at least one dicarboxylic acid comprising at least 5 mol % of a dicarboxylic acid having from 10 to 36 carbon atoms,
and
b) from 80 to 20% by weight of a polyester, prepared from
&agr;) a mixture of from 30 to 95 mol % of an aromatic dicarboxylic acid having from 6 to 20 carbon atoms and from 70 to 5 mol % of the same dicarboxylic acid as in the polyamide of the adhesion promoter, having from 10 to 36 carbon atoms, and
&bgr;) at least one diol having from 2 to 12 carbon atoms.
Type:
Grant
Filed:
February 22, 2000
Date of Patent:
January 1, 2002
Assignee:
Degussa-Hüls Aktiengesellschaft
Inventors:
Harald Haeger, Guido Schmitz, Franz-Erich Baumann, Giselher Franzmann, Georg Oenbrink
Abstract: The invention relates to a process for preparing alkali metal salts of malonic monoalkyl esters by selective saponification of malonic dialkyl esters using a basic alkali metal compound which comprises preparing from the malonic dialkyl ester and an alkali metal alkoxide, in a first stage, a CH-acid alkali metal salt of the malonic dialkyl ester and hydrolyzing this in a second stage by the action of water.
Abstract: The present invention relates to a process for the preparation of alkoxysilanes in which at least one halogenosilane is reacted with at least one alcohol in the presence of metallic magnesium and the alkoxysilane is isolated from the crude product.
Type:
Grant
Filed:
November 13, 2000
Date of Patent:
November 27, 2001
Assignee:
Degussa-Huels Aktiengesellschaft
Inventors:
Peter Löwenberg, Thomas Schlosser, Michael Horn, Ralf Laven, Jaroslaw Monkiewicz