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
Abstract: Antimicrobial activity is imparted to the surface(s) of an apparatus or article by polymerizing tert-butylaminoethyl methacrylate in the presence of the apparatus or article by which adhesion of the polymer to the surface(s) is achieved. In a preferred embodiment of the invention the antimicrobial monomer is graft polymerized on the surface(s).
Type:
Grant
Filed:
March 17, 2000
Date of Patent:
November 13, 2001
Assignee:
Degussa-Huels Aktiengesellschaft
Inventors:
Peter Ottersbach, Frank Hill, Christine Anders
Abstract: A product made from plastic and composed, at least in part, of a thermoplastic molding composition which comprises polyamide and comprises from 3 to 30% by weight of a conductivity black, where the conductivity black is defined by the following parameters:
a) DBP absorption of from 100 to 300 ml/100 g;
b) a specific surface area of from 30 to 180 m2/g;
c) an ash content of less than 0.1% by weight and
d) a grit content of not more than 25 ppm,
has improved heat-ageing resistance, and also improved resistance to peroxide-containing motor fuels.
Type:
Grant
Filed:
November 17, 1999
Date of Patent:
November 13, 2001
Assignee:
Degussa Huels AG
Inventors:
Franz-Erich Baumann, Reinhard Beuth, Josef Kübber, Michael Schlobohm
Abstract: A process for the preparation of cyclooctanol from cyclooctene comprising:
a. reaction of cyclooctene with formic acid in the absence of an added catalyst to produce a two-phase reaction mixture containing cyclooctyl formate and residual formic acid,
b. separation of the two phases into a lower phase rich in formic acid (phase A) and an upper phase low in formic acid (phase B),
c. extraction of cyclooctyl formate from phase A to obtain an extract,
d. combination of phase B and the extract from phase A,
e. distillative work-up of the combination of phase B and the extract from phase A in an apparatus fitted with a short distillation path to obtain crude cyclooctyl formate, and
f. catalytic transesterification of the cyclooctyl formate of said crude cyclooctyl formate with an alcohol to produce cyclooctanol.
Type:
Grant
Filed:
September 18, 2000
Date of Patent:
November 6, 2001
Assignee:
Degussa Huels AG
Inventors:
Guenther Kohler, Manfred Kaufhold, Renate Paulczynski, Michael Beuth
Abstract: Molecular weight-enlarged, homogeneously soluble ligands are provided that are especially useful for hydrogenation catalysts, wherein the ligands contain homochiral active centers of bis(3,4-diarylphosphinyl)pyrrolidines, and their use in producing cataylsts for enantioselective reactions, as well as the catalysts thus produced.
Type:
Application
Filed:
January 24, 2001
Publication date:
October 25, 2001
Applicant:
Degussa-Huels Aktiengesellschaft
Inventors:
Olaf Burkhardt, Jens Woeltinger, Andreas Bommarius, Juan Jose Almena Perea, Hans Henniges, Karlheinz Drauz, Andreas Karau, Jean-Louis Philippe, Hans-Peter Krimmer, Gunther Oehme
Abstract: A dish rack for a dishwasher, including a frame and a coating covering the frame and configured to distribute water over a surface of the coating in a thin film.
Abstract: A solid, oxazoline-terminated, urethane-functional polyaddition compound having a melting point ranging from 40-130° C. and a free NCO content of less than 3% by weight, consisting essentially of a reaction product of a) at least one at least difunctional polyisocyanate and b) at least one hydroxy- or amino-functional oxazoline derivative, the ratio of NCO to OH equivalents ranging from 0.8:1.2 to 1.2:0.8.
Abstract: A process for the isolation of high-boiling monomers from distillation residue formed in the cyclodimerization and/or cyclotrimerization of 1,3-butadiene after target products of cyclooctadiene, vinylcyclohexene and/or cyclododecatriene have been separated off, comprising extracting the distillation residue with a nonpolar or slightly polar solvent, separating off insoluble oligomers and polymers that have at least partly crystallized by mechanical separation, removing the extractant, and isolating the high-boiling monomers.
Type:
Application
Filed:
January 31, 2001
Publication date:
October 11, 2001
Applicant:
DEGUSSA-HUELS AKTIENGESELLSCHAFT
Inventors:
Thomas Schiffer, Matthias May, Norbert WILCZOK, Georg Oenbrink
Abstract: A crosslinkable hot-melt adhesive composition, comprising a reactive powder mixed with a crosslinking component of a crosslinking agent bound in a polyolefin matrix, wherewith the components of the composition do not react by crosslinking until the mixture is melted, said composition being useful for the coating and/or lamination of sheet-like structures.
Abstract: Particulate magnesium ethoxide having a high coarse particle content can be obtained in a simple and economical manner by the present invention, which provides a process for preparing particulate magnesium ethoxide having a coarse grain content, and includes reacting metallic, optionally activated, magnesium with liquid ethanol under pressure at a temperature above 78° C. The present invention also relates to particulate magnesium ethoxide having a coarse grain content, which contains:
<40% by weight of a screening fraction ≦500 &mgr;m and
≧60% by weight of a screening fraction >500 &mgr;m.
Type:
Grant
Filed:
October 27, 1999
Date of Patent:
October 2, 2001
Assignee:
Degussa-Huels Aktiengesellschaft
Inventors:
Reinhold Schork, Burkhard Standke, Hartwig Rauleder, Albert-Johannes Frings, Michael Horn, Peter Jenkner, Jaroslaw Monkiewicz
Abstract: An extrusion-coated metal article is prepared by applying a mixture which comprises an organosilane composition to a metal surface, and then extruding a melt of a polyamide molding composition onto the coated surface thus treated and dried.
Abstract: A process for electrolytically producing an amalgam from metal salt, using an anion exchanger membrane. The chlorine-free process provides amalgam produced from metal salt and having a high degree of purity, and ensures advantageous parameters, such as a low cell voltage and high current efficiencies.
Type:
Grant
Filed:
March 19, 1999
Date of Patent:
September 25, 2001
Assignee:
Degussa-Huels Aktiengesellschaft
Inventors:
Carl Heinz Hamann, Peter Schmittinger, Joerg Helling
Abstract: The present invention provides a process for producing N-acyl-protected amino acids with the general formula I
by amidocarbonylation whereby carbon monoxide, an amide/nitrile and an aldehyde, are reacted in the presence of a metal catalysts such as rhodium, iridium or ruthenium catalysts.
Type:
Grant
Filed:
June 26, 2000
Date of Patent:
September 25, 2001
Assignee:
Degussa-Huels AG
Inventors:
Karlheinz Drauz, Olaf Burkhardt, Matthias Beller, Markus Eckert, Wahed Moradi, Helfried Neumann
Abstract: The invention relates to a process for preparing vinyl chlorosilanes, that includes thermally and non-catalytically reacting chlorosilane with vinyl chloride at a temperature of 550 to 700° C. by flowing the chlorosilane and vinyl chloride through a ring-gap space in a ring-gap reactor to produce a reaction gas; the ring-gap space having a cross-sectional area and a volume; and, after the flowing, further reacting, adiabatically, the reaction gas in a second zone to produce a hot reaction gas that contains vinylchiorosilane; wherein the second zone has a cross-sectional area that is greater than the cross-sectional area of the ring-gap space; and wherein the second zone has a volume that is in a ratio to the volume of the ring-gap space of 0.15:1 to 1.5:1. The invention also provides an apparatus for carrying out the above process.
Type:
Grant
Filed:
April 24, 2000
Date of Patent:
September 18, 2001
Assignee:
Degussa Huels AG
Inventors:
Stefan Bade, Bernt Kesper, Robert Koell, Hartwig Rauleder, Uwe Schoen