Abstract: Process for the production of shaped articles of niobium or tantalum by electrochemical etching of a niobium or tantalum sheet covered by a structured photoresist mask in an aqueous solution containing hydrofluoric acid, the etching being effected under electrochemical conditions under which strong noise is superposed on the etching current and the etching solution contains a water-soluble polymer.

Abstract: A process for the preparation of an aromatic carbonate is disclosed. The process entails reacting an aromatic hydroxy compound of the formula R—(O—H)k, with carbon monoxide and oxygen, optionally in a solvent and in the presence of catalyst components, characterized in that after an initial partial charge of R—(O—H)k to the reaction mixture, the balance thereof is subsequently metered into the reaction mixture at least once in the course of the reaction.

Abstract: Blocked polyisocyanates and one-component stoving systems containing these blocked polyisocyanates, and the preparation thereof and their use for the preparation of lacquers, paints, adhesives and elastomers, wherein blocked polyisocyanates are prepared by reacting polyisocyanates with secondary amines corresponding to the formula wherein R1—R4 can be identical or different and denote hydrogen, C1–C6-alkyl or cycloalkyl, R5 denotes C1–C10-alkyl, C3–C10-cycloalkyl, y denotes a number from 2 to 8, and B represents wherein R6–R8 can be identical or different and independently of one another denote C1–6-alkyl and/or C3–C6-cycloalkyl, R9 denotes hydrogen or C1–6-alkyl or C3–C6-cycloalkyl.

Abstract: The present invention relates to polyol dispersions with long-term stability, to cellular polyurethane moldings produced therewith, to processes for their preparation and to their use.

Abstract: The present invention relates to polymer blends containing a component selected from the group poly(ester)carbonates, graft polymers or mixtures thereof, polyalkylene naphthalate as the second component optionally together with a further component selected from the group of vinyl (co)polymers, polyalkylene terephthalates or mixtures thereof, wherein mixtures of polycarbonate, polyalkylene naphthalate and optionally polyalkylene terephthalate contain no tetrafluoroethylene polymer.

Abstract: The invention relates to compounds having a core-shell structure, to a process for preparing them and to their use as semiconductors in electronic components.

Abstract: A composition and method for consolidating aggregate material is disclosed. The method includes introducing a reaction composition into the aggregate material and allowing it to reach on form a polymer which binds the aggregate together. The composition includes polyol, isocyanate, and ester.

Abstract: A dielectric capacitor having self healing properties is disclosed. The capacitor includes a film made of an amorphous aromatic copolycarbonate having a weight average molecular weight of at least 10,000 and a glass transition temperature of at least 160° C. In a preferred embodiment the copolycarbonate includes structural units derived from bisphenol TMC. Also disclosed is a process for making the film.

Abstract: Blocked polyisocyanates and one-component stoving systems containing these blocked polyisocyanates, and the preparation thereof and their use for the preparation of lacquers, paints, adhesives and elastomers. The blocked polyisocyanates are derived from polyisocyanates reacted with secondary amines and cationic, anionic and/or nonionic hydrophilizing agents such that they are incorporated into the polyisocyanate at a ratio of from 20:1 to 1:1, wherein the blocking agents correspond to the formula R1–R4 can be identical or different and independently of one another denote hydrogen, C1–C6-alkyl or C3–C6-cycloalkyl, R5 denotes C1–C10-alkyl, C3–C10-cycloalkyl, and B represents ?wherein R6–R8 can be identical or different and independently of one another denote C1–C6-alkyl and/or C1–C6-cycloalkyl, R9 denotes hydrogen or C3–C6-alkyl or C3–C6-cycloalkyl.

Abstract: The invention relates to a method for producing polycarbonate according to the method for the transesterification of molten mass whereby bis-(hydroxyaryl) compounds (bisphenols) and diaryl carbonates are reacted by means of reactive rectification.

Abstract: An improvement in the continuous two-phase interfacial condensation process for preparing polycarbonate is disclosed. In the process that entails at least one diphenol, phosgene, at least one chain terminator, and optionally branching agents and is carried out in the presence of a catalyst the improvement comprising maintaining the concentration of the catalyst at a level of at least 0.012 mol per mol of diphenol.

Abstract: An anionic cellulose nitrate derivative is described, which has: (i) a degree of acid group substitution (DS (acid)) in the range of 0.01 to 0.2; and (ii) a nitrogen content of 10.7 wt. % to 12.3 wt. %, based on the weight of cellulose nitrate derivative. The anionic cellulose nitrate derivative is prepared by a process which includes esterifying cellulose nitrate feed material with at least one dicarboxylic acid anhydride (e.g., maleic anhydride). Aqueous dispersions according to the present invention include: (a) at least on anionic cellulose nitrate derivative according to the present invention; and (b) at least one base.

Abstract: The present invention relates to a process for preparing polyisocyanates containing acylurea groups by reacting isocyanates corresponding to formula (I) R—(NCO)n,??(I) wherein R represents an n-valent linear or branched aliphatic group or cycloaliphatic group having 4 to 30 carbon atoms or an aromatic group having 6 to 24 carbon atoms and n is 1, 2, 3 or 4, with aliphatic and/or aromatic carboxylic acids in the presence of a metal salt catalyst at a temperature of 20 to 220° C. The present invention also relates to the reaction products (polyisocyanates) prepared by this process and to their use as binders for polyurethane coating compositions.

Abstract: A thermoplastic molding composition having improved flammability rating and mechanical properties is disclosed. The composition contains aromatic polycarbonate having a weight-average molecular weight Mw?25,000 g/mol., polyalkylene terephthalate, graft (co)polymer characterized in that its grafted phase includes structural units derived from acrylate monomers, an oligomeric organic phosphoric acid ester, and an optional fluorinated polyolefin. In a preferred embodiment the graft (co)polymer is characterized in its core-shell morphology.

Abstract: The invention relates to the use of cycloalkylphosphines as catalysts for isocyanate dimerization and to a process for preparing polyisocyanates containing uretdione groups.

Abstract: Process for producing a valve metal powder by producing a precursor of desired morphology, converting the precursor into an oxide of the valve metal, stabilizing the structure of the oxide by heat treatment and reducing the stabilized oxide while retaining the morphology. Valve metal powders obtainable in this way, in particular comprising spherical agglomerates with a mean agglomerate size of 10–80 ?m, preferably 20–40 ?m, and use of these valve metal powders to produce solid electrolyte capacitors.

Abstract: The present invention is directed to a method of preparing an article of manufacture. The method includes bringing at least a portion of a heated thermoplastic sheet into contact with at least a portion of the first surface of a support having a plurality of perforations. A vacuum is formed on the second surface of the support, and portions the heated thermoplastic sheet are drawn through the perforations of the support and to the second surface side of the support. Thermoplastic attachment heads are formed on the second surface side of the support, from the thermoplastic material of the sheet that is drawn through the perforations. The thermoplastic sheet and the support are fixedly attached one to the other by means of the edges of the perforations being embedded in the thermoplastic material of the sheet drawn therethrough, and the thermoplastic attachment heads. Also disclosed are articles of manufacture, such as interior and exterior automotive body panels and components.

Abstract: A process for stripping volatile constituents from polymer melts is disclosed. The process entails introducing the polymer melt into a horizontally oriented cylindrical device that contains a plurality of perforated disks rotating about a common horizontally oriented, externally driven shaft bringing the melt and disks into contact in a manner calculated to constantly renew the surface of the melt to be stripped. Also disclosed is an apparatus suitable for the process.

Abstract: Ytterbium(III) acetylacetonate is used as a catalyst for the preparation of aliphatic oligocarbonate polyols by transesterification of at least one organic carbonate with at least one aliphatic polyol.

Abstract: An adhesive, sealant or coating composition that includes: a) 20 to 80% by weight, based on the weight of a), b), and c) of a polyether urethane containing two or more reactive silane groups and one or more polyether segments, b) 20 to 80% by weight, based on the weight of a), b), and c) of a polyether urethane containing one reactive silane group and one or more polyether segments, and c) 1 to 60% by weight, based on the weight of a), b), and c) of a pigment having a BET surface area of from 15 to 100 m2/g and an oil absorption of from 40 to 110 cc/100 g; where the sum of a), b), and c) does not exceed 100% by weight. The composition can be used to bond and/or coat substrates.