Abstract: A light emitting element includes edge-lit luminaires of transparent light guiding material having an increased resistance against UV-light and high temperatures. The light emitting element can be advantageously employed as a light source in outdoor applications such as traffic signs, street lights, advertising panels, outdoor illumination means or in exterior vehicle lighting.

Abstract: A process is useful for producing optical molding materials on the basis of methyl methacrylate (MMA), wherein this MMA has been produced by an optimized method and the molding materials feature in particular a very low yellowness index. This MMA has been produced by direct oxidative esterification of methacrolein. In particular, an optimized workup of the reactor output from the oxidative esterification of methacrolein is useful for removing particularly discoloring byproducts. This process moreover has the advantage that fewer demands than described in related art are placed on plant apparatus configuration.

Abstract: The present invention relates to a composite system, preferably a multilayer film, having high impact resistance and heat distortion resistance, and to a process for production thereof and to the use thereof.

Abstract: The invention relates to novel poly(meth)acrylates for producing moulding compositions. In particular, the invention relates to novel methacrylates having ester groups which, in the cleavage process, liberate at most only a very small amount of components which are not re-copolymerizable. Copolymerization of monomers of this type in the production of the novel poly(meth)acrylates for moulding compositions brings about only minimal alteration of the heat resistance of these materials or may indeed improve the same.

Abstract: The invention relates to a vented extruder (1) for the devolatilization of a polymer material, encompassing at least one extruder barrel (2) with at least one rotatably driven extruder screw (3) mounted in the extruder barrel (2), and with at least one material feed and with at least one extrudate outlet, and also with at least one vent zone (9). A particular feature of the vented extruder (1) is that the gas output for the gas arising in the vent zone (9) has been provided upstream of the material feed, in relation to the direction of conveying of the polymer material.

Abstract: The invention relates to a vented extruder (1) for the devolatilization of a polymer material. The vented extruder (1) encompasses at least one drive (4), at least one gearbox (5), at least one rotatably driven extruder screw (3), at least one first material feed (6) and at least one extrudate outlet (13). A feature of the vented extruder (1) according to the invention is that the drive, encompassing drive (4) and gearbox (5), has been provided in the region of that end of the extruder screw (3) that is downstream in relation to the direction of conveying of the polymer.

Abstract: The invention relates to novel composite materials with improved mechanical properties and improved weathering resistance, said composite materials being made of at least one material containing cellulose, preferably wood, and at least one plastic, and to a method for producing said composite materials and for using same.

Abstract: The invention relates to novel composite materials which are made of at least one material containing cellulose, preferably wood, and at least one plastic material, and which have improved mechanical and weather resistance properties.

Abstract: The invention provides a process for preparing 1-alkoxy-2-methyl-1-oxopropan-2-yl(meth)acrylate, e.g. 1-methoxy-2-methyl-1-oxopropan-2-yl(meth)acrylate, by transesterifying alkyl ?-hydroxyisobutyrates. Copolymerization of such monomers in the preparation of poly(meth)acrylate-based moulding materials improves the heat distortion resistance thereof.

Abstract: The invention relates to novel poly(meth)acrylates for producing moulding compositions. In particular, the invention relates to novel methacrylates having ester groups which, in the cleavage process, liberate at most only a very small amount of components which are not re-copolymerizable. Copolymerization of monomers of this type in the production of the novel poly(meth)acrylates for moulding compositions brings about only minimal alteration of the heat resistance of these materials or may indeed improve the same.

Abstract: The invention relates to a stirred-tank reactor and to a method for carrying out a polymerization reaction of unsaturated monomers using a stirred-tank reactor. According to the invention, said stirred-tank reactor is characterized in that the product discharge point is designed as the central base outlet that is at least partially traversed by the agitator shaft. Said polymerization is performed continuously under positive pressure, so that the stirred-tank reactor is operated hydrodynamically.

Abstract: The invention relates to a copolymer for producing molded compounds or cast glass for the production of molded bodies having increased dimensional stability under heat, obtainable from the copolymerization of A) one or more ethylenically unsaturated ester compounds of the formula (I), where R1 is hydrogen or methyl and R2 a linear or branched alkyl group with 1 to 8 carbon atoms, B) one or more ethylenically unsaturated ester compounds of the formula (II), where R3 is hydrogen or methyl and R4 a cyclic group with 8 to 30 carbon atoms, C) one or more ethylenically unsaturated ester compounds of the formula (III), where R5 is hydrogen or methyl and R6 and R7, independently of each other, are hydrogen or a linear or branched group with 1 to 40 carbon atoms.

Abstract: The invention relates to a vented extruder (1) for the devolatilization of a polymer material. The vented extruder (1) encompasses at least one drive (4), at least one gearbox (5), at least one rotatably driven extruder screw (3), at least one first material feed (6) and at least one extrudate outlet (13). A feature of the vented extruder (1) according to the invention is that the drive, encompassing drive (4) and gearbox (5), has been provided in the region of that end of the extruder screw (3) that is downstream in relation to the direction of conveying of the polymer.

Abstract: The invention relates to a stirred-tank reactor and to a method for carrying out a polymerisation reaction of unsaturated monomers using a stirred-tank reactor. According to the invention, said stirred-tank reactor is characterised in that the product discharge point is designed as the central base outlet that is at least partially traversed by the agitator shaft. Said polymerisation is performed continuously under positive pressure, so that the stirred-tank reactor is operated hydrodynamically.

Abstract: Compositions comprising an organic polymer as the matrix and inorganic particles as the filler and exhibiting in mixture a) 20 to 99.9% by wt. of an organic polymer and b) 0.1 to 80% by wt. of inorganic particles, where the sum of the constituents a) and b) amounts to 100% by wt.; and optionally c) 0 to 100 parts by weight of b) of various additives, in which case the content of the additives c) relates to the sum of a) and b), calculated as 100 parts by weight. characterized in that the composition can be obtained by incorporating particles and optionally other additives into the polymer matrix, in which case the particles to be incorporated i) are aggregates of globular primary particles; ii) the size of the primary particles is in a range of 0.5 nm to less than 100 nm; iii) the volume-weighted median value d50 of the particles is in a range of greater than 0.50 ?m to 0.

Abstract: The invention relates to a tube bundle heat exchanger for transferring heat for the temperature sensitive and/or polymerisible substances. Said heat exchanger comprises a housing (4) having one or more product outlets (8) and one or more product inlets (1) and a tube bundle is arranged in said housing. Displacer rods (7, 10, 12, 15) are arranged in the tubes of the tube bundle and at least one heat exchanger cap of the tube bundle heat exchanger is filled with displacer bodies (3) for reducing the volume filled with the product.

Abstract: The invention relates to a vented extruder (1) for the devolatilization of a polymer material, encompassing at least one extruder barrel (2) with at least one rotatably driven extruder screw (3) mounted in the extruder barrel (2), and with at least one material feed and with at least one extrudate outlet, and also with at least one vent zone (9). A particular feature of the vented extruder (1) is that the gas output for the gas arising in the vent zone (9) has been provided upstream of the material feed, in relation to the direction of conveying of the polymer material.

Abstract: The invention relates to a process for continuous preparation of alkyl (meth)acrylates by transesterification of methyl (meth)acrylate using alcohols which are high-boiling relative to methanol. A particular workup technique achieves product qualities which have hitherto not been attained. Very high space-time and overall yields can also be achieved.

Abstract: The invention relates to a process for continuous preparation of alkyl (meth)acrylates by transesterification of methyl (meth)acrylate using alcohols which are high-boiling relative to methanol. A particular workup technique achieves product qualities which have hitherto not been attained. Very high space-time and overall yields can also be achieved.