Abstract: Compositions are described comprising a) polyoxymethylene, b) thermoplastic elastomer having active hydrogen atoms, c) polyoxymethylene which differs from component a) and contains active hydrogen atoms, d) reagent for covalent coupling of components b) and c), and e) if appropriate, another impact modifier, which differs from component b). The compositions feature improved toughness and can be used for production of moldings.

Abstract: The present invention relates to novel molding compositions based on semicrystalline engineering thermoplastics which, in conventional processing techniques, give moldings with reduced surface gloss. A feature of the molding compositions is that they comprise, in a polymer matrix, if appropriate with the usual additives, polymer particles with a median size d50 of from 0.1 ?m to 100 ?m, and comprise at least one other incompatible or semicompatible polymer which has not been chemically crosslinked, and also, if appropriate, comprise salt-like additives. The invention further relates to moldings which are produced by means of conventional processing techniques, in particular via injection molding, from these matt-effect molding compositions.

Abstract: The present invention relates to novel molding compositions based on semicrystalline engineering thermoplastics which, in conventional processing techniques, give moldings with reduced surface gloss. A feature of the molding compositions is that they comprise, in a polymer matrix, if appropriate with the usual additives, polymer particles with a median size d50 of from 0.1 ?m to 100 ?m, and comprise at least one other incompatible or semicompatible polymer which has not been chemically crosslinked, and also, if appropriate, comprise salt-like additives. The invention further relates to moldings which are produced by means of conventional processing techniques, in particular via injection molding, from these matt-effect molding compositions.

Abstract: Compositions are described comprising a) polyoxymethylene, b) thermoplastic elastomer having active hydrogen atoms, c) polyoxymethylene which differs from component a) and contains active hydrogen atoms, d) reagent for covalent coupling of components b) and c), and e) if appropriate, another impact modifier, which differs from component b). The compositions feature improved toughness and can be used for production of moldings.

Abstract: The present invention relates to novel molding compositions based on semicrystalline engineering thermoplastics which, in conventional processing techniques, give moldings with reduced surface gloss. A feature of the molding compositions is that they comprise, in a polymer matrix, if appropriate with the usual additives, polymer particles with a median size d50 of from 0.1 ?m to 100 ?m, and comprise at least one other incompatible or semicompatible polymer which has not been chemically crosslinked, and also, if appropriate, comprise salt-like additives. The invention further relates to moldings which are produced by means of conventional processing techniques, in particular via injection molding, from these matt-effect molding compositions.

Abstract: A process is proposed for producing non-oxidic ceramic having a thermal conductivity in a predetermined range. A shaped body of non-oxidic ceramic material is heated to remove organic constituents, and is subsequently thermally treated in an oxygen-containing atmosphere to incorporate oxygen atoms into the crystal lattice of the non-oxidic ceramic, with the temperature and/or the hold time at this temperature being selected as a function of the predetermined thermal conductivity range, and the shaped body is finally sintered in a non-oxidizing atmosphere.

Abstract: A water sensitive ceramic powder, in particular aluminum nitride, is provided with a hydrophobic coating. The coated powder is dispersed in water with addition of a binder and a nonionic surfactant from the group comprising ethylene oxide adducts with an HLB value of from 10 to 14. Subsequently the aqueous slip is converted into a free flowing granulated powder. The nonionic surfactant, which is added in an amount sufficient to give a monomolecular layer, makes possible a good dispersion of the hydrophobically coated powder in water.

Abstract: A planar sensor made of ceramic material, for measuring and detecting combustible gases and/or the oxygen content in furnaces or in the exhaust gases of internal combustion engines, is described. The sensor has an at least five-layered structure on the basis of a combination of three zirconium dioxide layers with two aluminum oxide layers, a metallic heating resistor being embedded between two aluminum oxide layers, and three zirconium dioxide layers being combined with two platinum electrodes and one further electrode made of a binary or ternary alloy of platinum with gold, nickel, copper, rhodium, ruthenium, palladium or titanium. A process for fabricating the sensor is also described. It is also possible for the sensor to be combined, according to the invention, with a suitable housing which on its outside is provided with connecting wires and plugs for transmitting the measured signals.

Abstract: A planar oxygen sensor based on zirconium dioxide is described which is suitable for measuring the oxygen content in combustion furnaces or in the exhaust gases of internal combustion engines. Disposed on an external surface of the sensor is a noble-metal measuring electrode and located in its interior is a reference electrode which is connected to an external contact and is enclosed by two zirconium dioxide layers. One of these layers has, in its region near the edge, a hole whose outwardly pointing part is sealed by a solder glass. The internal part of the hole is partially filled with sintered platinum which makes a conductive connection between a platinum wire, passing outwards through the hole, as external contact and a platinum conductor track which is disposed on the internal interface of the zirconium dioxide layer and which leads to the reference electrode. A method of producing the oxygen sensor is also described.