[Stephan Herwig, Thomas Ostrowski, Dirk Meckelnburg, Achim Loeffler, Renata Jovanovic, Werner Weinle] DE,,Hassloch;DE,,Mannheim;DE,,Ludwigshafen;DE,,Speyer;DE,,Ludwigshafen;DE,,Bad Friedrichshall; The invention provides a process for continuously preparing polyether alcohols using DMC catalysts, which comprises, in a first step, in a continuous reactor, adding alkylene oxides onto H-functional starter substances and transferring the output of this reactor to a second step in a reactor which is divided by closed trays into mutually separate sections, known as compartments, which are connected to one another by external pipelines, in which the output of the reactor from the first step of the reaction passes through the compartments in succession.

[Gerrit Luinstra, Florian Becker, Matthias Müller, Dirk Meckelnburg, Jens Assmann] DE,,Hamburg;DE,,Mannheim;DE,,Pfungstadt;DE,,Limburgerhof;DE,,Mannheim; A thermoplastic copolymer prepared from acrylonitrile and para-alpha-dimethylstyrene via bulk or solution polymerization has an improved heat distortion temperature and can be used together with graft copolymers and further components for the preparation of thermoplastic moldings.

[Gerrit Luinstra, Florian Becker, Matthias Müller, Dirk Meckelnburg, Jens Assmann] DE,,Hamburg;DE,,Mannheim;DE,,Pfungstadt;DE,,Limburgerhof;DE,,Mannheim; A thermoplastic copolymer prepared from acrylonitrile and para-alpha-dimethylstyrene via bulk or solution polymerization has an improved heat distortion temperature and can be used together with graft copolymers and further components for the preparation of thermoplastic moldings.

[BIDELL, Wolfgang, LUTZ, Gerald, LANGHAUSER, Franz, SCHERER, Günter, MECKELNBURG, Dirk, OELZE, Jürgen, GERBIG, Hans-Jürgen, HÜHNERBEIN, Jürgen] {Via Pergolesi 25 20124 Milano;IT(IT)(IT)}{G 7, 18 68158 Mannheim;DE(DE)(DE)}{Minzeweg 3 50999 Köln;DE(DE)(DE)}{Haagweg 18 67152 Ruppertsberg;DE(DE)(DE)}{Mantelbergstr. 36 67435 neustadt an der Weinstrasse;DE(DE)(DE)}{Schanzstr. 105 67063 Ludwigshafen;DE(DE)(DE)}{Rheinecke 20 67071 Ludwigshafen;DE(DE)(DE)}{Lange Gewann 69 67346 Speyer;DE(DE)(DE)}{Königsfeld 19 53562 Katherinen;DE(DE)(DE)} The invention relates to a method for measuring the level of a medium in a reactor during continuously operated polymerisation processes, whereby the limiting surface of each phase in the reactor is measured with the aid of an ionising radiation. Said method is characterised in that at least one measuring unit, consisting of a radiation source that emits ionising radiation and a corresponding detector, is brought up to the limiting surface in the reactor and is fixed in a flexible manner in the vicinity. To measure the level of the medium, the limiting surface of the phase is determined by measuring the radioactive backscatter of said phase.

[Martin Weber, Peter Ittemann, Axel Gottschalk, Bernd Niedermaier, Birgit Reinhard, Dirk Meckelnburg] DE,,Maikammer;DE,,Lampertheim;DE,,Neustadt;DE,,Ludwigshafen;DE,,Limburgerhof;DE,,Limburgerhof; The present invention relates to processes for preparing copolymers A) with a reduced soil particle content, comprising 49.2 to 93.2% by weight of structural units which derive from one or more vinylaromatic monomers (component A1)), 6 to 50% by weight of structural units which derive from one or more vinyl cyanides (component A2)), 0.8 to 7% by weight of structural units which derive from one or more dicarboxylic anhydrides (component A3)) and 0 to 25% by weight of structural units which derive from further copolymerizable monomers (component A4)), where the percentages by weight are each based on the total weight of the structural units which derive from components A1), A2), A3) and A4), and together add up to 100% by weight, by bulk or solution polymerization, it being essential to the invention that the mathematical product of the percentages by weight of the structural units which derive from component A2) and the percentages by weight of the structural units which derive from component A3) in the copolymer A) is in the range from 40%2 by weight to 65%2 by weight. The present invention further relates to the copolymers A), to thermoplastic molding materials comprising the copolymers A), to the use of the copolymers A) and of the thermoplastic molding materials, and to the moldings, films, fibers and foams obtainable from the copolymers A) and the thermoplastic molding materials.

[Vinit Chilekar, Oliver Bey, Andreas Brodhagen, Achim Löffler, Fatemeh Ahmadnian, Ralf Böhling, Christoph Grossmann, Ulrich Kammel, Ronald Adelmann, Thomas Ostrowski, Milind Joshi, Gerrit Waters, Dirk Meckelnburg, Vinit Chilekar, Oliver Bey, Andreas Brodhagen, Achim Löffler, Fatemeh Ahmadnian, Ralf Böhling, Christoph Grossmann, Ulrich Kammel, Ronald Adelmann, Thomas Ostrowski, Milind Joshi, Gerrit Waters, Dirk Meckelnburg] BE,,Tervuren;DE,,Niederkirchen;DE,,Tiefenthal;DE,,Speyer;DE,,Ludwigshafen;DE,,Lorsch;DE,,Gruenstadt;BE,,Kapellen;DE,,Darmstadt;DE,,Mannheim;DE,,Ludwigshafen;DE,,Karlsruhe;DE,,Limburgerhof; A process for a continuous production of a polyetherol first involves reacting an alcohol with a starter or an alkoxylated precursor, to give a mixture comprising an alcoholate and water. Water is then removed from the mixture. The process further involves feeding the alcoholate into a bubble column and feeding an alkylene oxide into the bottom of a compartment of the bubble column, such that the alkylene oxide rises in the alcoholate. The alkylene oxide then reacts with the alcoholate or a secondary product from the reaction between the alcoholate and alkylene oxide, to give the polyetherol.

[Vinit Chilekar, Oliver Bey, Andreas Brodhagen, Achim Loffler, Fatemeh Admadnian, Ralf Bohling, Christoph Grossmann, Ulrich Kammel, Ronald Adelmann, Thomas Ostrowski, Milind Joshi, Gerrit Waters, Dirk Meckelnburg] BE,,Tervuren;DE,,Niederkirchen;DE,,Tiefenthal;DE,,Speyer;DE,,Ludwigshafen;DE,,Lorsch;DE,,Grunstadt;BE,,Kapellen;DE,,Darmstadt;DE,,Mannheim;DE,,Ludwigshafen;DE,,Karlsruhe;DE,,Limburgerhof; A process for a continuous production of a polyetherol first involves reacting a catalyst (5) with an alcohol starter (3) or an alkoxylated precursor, to give a mixture comprising an alcoholate and water. Water is then removed from the mixture. The process further involves feeding the alcoholate into a bubble column and feeding an alkylene oxide into the bottom of a compartment of the bubble column, such that the alkylene oxide rises in the alcoholate. The alkylene oxide then reacts with the alcoholate or a secondary product from the reaction between the alcoholate and alkylene oxide, to give the polyetherol.

[SCHWITTAY, Claudius, BLINZLER, Marko, MECKELNBURG, Dirk] {67056 Ludwigshafen;DE(DE)(DE)}{Bergstrasse 152 69121 Heidelberg;DE(DE)(DE)}{Bellenstrasse 34 68163 Mannheim;DE(DE)(DE)}{Schanzstrasse 105 67063 Ludwigshafen;DE(DE)(DE)} A process is proposed for preparation of a polyoxymethylenehomo- or copolymer end product starting from a polyoxymethylenehomo- or copolymer melt via a) addition and incorporation of additives, b) degradation of unstable chain ends and c) devolatilization for removal of volatile components, and is characterized in that only a substream of at most 10% by weight of the starting polyoxymethylenehomo- or copolymer melt or a corresponding mass flow of the melt of a polyoxymethylenehomo- or copolymer end product which meets specification or which is of lower quality is passed by way of an ancillary extruder in order to carry out step a) of the process giving an additive-modified ancillary stream, and the remainder of the process is carried out without using an extruder.

[Thomas Ostrowski, Johannes Adam, Dirk Meckelnburg, Ulrike Mahn, Renata Jovanovic, Achim Loeffler] DE,,Mannheim;DE,,Dresden;DE,,Ludwigshafen;DE,,Mannheim;DE,,Ludwigshafen;DE,,Speyer; The invention relates to a process for the continuous preparation of polyether alcohols by reacting H-functional initiators with alkylene oxides using basic catalysts, wherein at least one initiator is metered with at least one alkylene oxide continuously into a back-mixing reactor and the reaction product is removed continuously from the back-mixing reactor.

[Achim Loeffler, Eckard Schauss, Matthias Schopohl, Dirk Meckelnburg] DE,,Speyer;DE,,Heuchelheim;DE,,Dresden;DE,,Limburgerhof; The invention provides a process for preparing polyether alcohols by adding alkylene oxides onto H-functional starter substances, of which at least one is solid at room temperature in a reaction vessel, by feeding the starting components continuously to the reaction vessel, which comprises preparing a paste from the solid starter substance and feeding this paste continuously to the reaction vessel.