Abstract: An actuating device includes an exhaust flap of a supercharging pressure control of turbocharged internal combustion engines. The exhaust flap is arranged pivotably in an exhaust pipe, in particular in the housing of a turbine of an exhaust-gas turbocharger, and controls in dependence on the compressor-side supercharging pressure the opening cross section of a bypass line which circumvents the turbine. The exhaust flap is arranged on an actuator arm which is fastened on a shaft mounted rotatably in the exhaust pipe and adjustable from outside the exhaust pipe via an adjustment lever and a control rod which is articulated thereto and via a linear control motor. In order to avoid vibration-induced buzzing noise in the actuating device, a friction damper is connected into the force flow between the shaft and the control rod, in particular for system damping in the region of the exhaust flap.

Abstract: An actuating device includes an exhaust flap of a supercharging pressure control of turbocharged internal combustion engines. The exhaust flap is arranged pivotably in an exhaust pipe, in particular in the housing of a turbine of an exhaust-gas turbocharger, and controls in dependence on the compressor-side supercharging pressure the opening cross section of a bypass line which circumvents the turbine. The exhaust flap is arranged on an actuator arm which is fastened on a shaft mounted rotatably in the exhaust pipe and adjustable from outside the exhaust pipe via an adjustment lever and a control rod which is articulated thereto and via a linear control motor. In order to avoid vibration-induced buzzing noise in the actuating device, a friction damper is connected into the force flow between the shaft and the control rod, in particular for system damping in the region of the exhaust flap.

Abstract: Process for preparing monodisperse weakly basic or optionally strongly basic anion exchangers of the poly(meth)acrylamide type, the ion exchangers themselves and their use.

Abstract: The present invention relates to a process for preparing novel, monodisperse anion exchangers by (a) reacting monomer droplets made from monovinylaromatic compounds and polyvinylaromatic compounds, and optional porogens and/or initiators, (b) amidomethylating the resultant monodisperse, crosslinked bead polymers with phthalimide derivatives, (c) converting the amidomethylated bead polymers to aminomethylated bead polymers, and (d) alkylating the aminomethylated bead polymers.

Abstract: The present invention relates to a process for preparing novel, monodisperse anion exchangers having strongly basic functional groups either in the center of the resin particle or in the shell of the resin particle, as well as to their use.

Abstract: The invention relates to processes for the preparation of free-flowing end products of strongly acidic cation exchangers. In the case of the strongly acidic cation exchangers prepared by the processes described in Patent Application P 195 48 012.0, the particle beds of the end products are not free-flowing. By additions of wetting agents or water-soluble initiators or surfactants in the polymerization stage or after the filtration of the end product and/or process engineering means, a permanent or temporary free flowability of the particle beds of the strongly acidic cation exchangers is achieved using the following processes. 1. By additions of known wetting agents in amounts of 0.25 g/l of aqueous phase or water-soluble initiators in amounts of 0.05 to 20 g/l of aqueous phase to the copolymerization system 20 minutes to 120 minutes after reaching the gel point. 2. By treatment of the strongly acidic cation exchangers with aqueous solutions of surface-active substances having a content of 0.

Abstract: The invention relates to sulfonated bead polymers prepared from styrene, vinylpyridines, further monomers, and crosslinkers, to a process for preparing them, and to their use as cation exchangers.

Abstract: Sulfonated strongly acidic cation exchangers are rendered free-flowing by treatment with wetting agents or water soluble initiators, washing with water at temperatures of at least 60° C. and heat drying.

Abstract: The invention relates to a process for the preparation of mechanically and osmotically stable, high-capacity strongly acidic cation exchangers having a particle size of ≧0.1 mm by sulphonation of gel-like or porous bead polymers with sulphuric acid without the use of inert chlorine-containing swelling agents and/or of comonomers based on acrylonitrile. According to the invention, such strongly acidic cation exchangers can be prepared by sulphonation of gel-like and porous bead polymers, prepared by copolymerization of styrene and divinylbenzene having a crosslinker content of up to 65% by weight of divinylbenzene with and without inert composition, with 80-96% strength sulphuric acid at temperatures of 125-180° C. and a reaction time of up to 20 h.