Abstract: Toughened thermoplastics are prepared by mechanically dewatering a water-moist elastomer component A containing up to 50% by weight of residual water and mixing the resulting dewatered elastomer component A' with a thermoplastic polymer B in a mixing unit, by a process in which the elastomer component A is fed to a twin-screw extruder which has corotating, in each case triple-flight, screws and essentially includes, in the transport direction,one unheated metering section in which the elastomer component A is fed to the extruder by a metering means,at least one squeeze section which serves for dewatering and contains at least one retarding element and in each case at least one associated dewatering orifice,at least one section in which the thermoplastic polymer B is introduced as a melt into the extruder,at least one section provided with mixing, kneading or other plasticating elements or combinations of these elements,at least one devolatilization section which is provided with at least one devolatilization

Abstract: Essentially dry materials are obtained by mechanically dewatering water-moist rubber, prepared by emulsion polymerization and precipitation, to give a compact material having a rubber content of at least 50%, by a process in which the previously dewatered rubber is fed to the feed section of a twin-screw extruder which has screws rotating in the same direction and possesses, in succession in the conveying direction, at least two back-up zones and two associated dewatering orifices, each of which may be provided with a retaining screw, and at least one kneading zone, one devolatilization zone and finally one discharge zone, which may be closed by a die lip, and the water separated off is discharged at the dewatering orifices in liquid form.

Abstract: An energy converter for generating high-power pulses includes a housing defining a chamber having an open side; an electrode assembly supported in the chamber; a power supply for applying a voltage to the electrode assembly; a fluid medium accommodated in the housing and being in contact with the electrode assembly for receiving pulses from the electrode assembly; and a diaphragm attached to the housing and closing the open side of the housing for encapsulating the electrode assembly and the fluid medium in the chamber. The diaphragm has an inner surface oriented toward the chamber and is in contact with the fluid medium. The diaphragm further has an outer surface oriented away from the chamber and is arranged for contacting a substance to be comminuted, whereby mechanical pulses transmitted from the fluid medium to the diaphragm are applied by the diaphragm to the substance to be comminuted.

Abstract: Mixtures of high molecular weight polyisobutylene and thermoplastic polymers are prepared in an extruder by a process in which meterable, high molecular weight polyisobutylene is first metered into the extruder and homogenized in at least one kneading stage, heated and subjected to controlled molecular weight degradation and the thermoplastic polymer is then introduced into the polyisobutylene melt by means of a side feed and is subsequently homogenized together with said melt. The novel process is particularly suitable for the preparation of mixtures of high molecualr weight polyisobutylene and polyethylene.

Abstract: For the preparation of polyarylene ether ketones by Friedel-Crafts polycondensation, a reaction mixture consisting ofA. a monomer system,B. a Lewis acid,C. if required, a Lewis base andD. an inert solventis subjected to polycondensation in two reaction zones, discharged from the second reaction zone with plug flow and compounded. The reaction mixture is subjected to polycondensation in the first reaction zone while stirring to a viscosity of about 2,000 mPa.s, is transferred to the second reaction zone and is discharged therefrom by means of an inert solvent or of an inert gas saturated with the solvent, under from about 6 to 65, preferably from 10 to 25, bar, the transport pressure being reduced in at least two stages and the pressure reduction in the first stage being not more than 60%.

Abstract: Copolymers crosslinkable by a free radical method are prepared by polymer-analogous reaction ofA) a copolymer (A) which is composed ofa1) from 20 to 85 mol % of a monomer (a1) having the structural element of methacrylic acid anda2) from 15 to 80 mol % of another monomer (a2) which undergoes free radical polymerization,a3) from 5 to 50 mol % of the total amount of the monomers (a1) and (a2) being monomers (a3) which carry functional groups and whose functional groups are capable of undergoing a condensation or addition reaction,withB) an olefinically unsaturated monomer (B) which carries a functional group which is complementary to that of the monomers (a3),by a process in which the polymer-analogous reaction is carried out at from 90.degree. to 150.degree. C. in an average residence time of from 3 to 20 minutes in highly concentrated solution or in the absence of a solvent. Said copolymers are used as binders for powder coatings.

Abstract: Semi-finished GMT sheet material of GMT recyclate in which more than 50% by weight of the glass fibers are more than 2 mm in length and which is produced by extruding GMT recyclate particles without significant comminution of the glass fibers.

Abstract: The invention relates to a holding element 1 of plastic, with a holding zone 2 for holding at least one part, and a fastening zone 3 to be connected with a support. Between the fastening zone 3 and the support is arranged at least one intermediate element 5 which allows selective lateral height and/or angular compensation or adjustment for the holding zone.

Abstract: Rhamnolipids with high surface activity are produced micro iologically in high yield per g of dry cell substance using Pseudomonas spec. DSM 2874 in the form of growing, resting and immobilized cell mass in an aqueous medium containing at least one assimilable carbon source at a pH of 6.7 to 7.3 and a temperature of 30.degree. to 37.degree. C. Two new rhamnolipids with only one .beta.-hydroxydecanoic acid residue in the molecule and defined as .alpha.-L-rhamnopyranosyl- and 2-O-.alpha.-L-rhamnopyranosyl-.alpha.-L-rhamnopyranosyl-.beta.-hydroxydeca noic acid with a molecular weight of 334 and 480, respectively, are obtained.

Abstract: A plastic or cable tie band element for clasping, holding and bundling of objects comprises a profiled band part 6 having a head part 1 joined thereto. Extending through the head part is a passage opening 8 for receiving the band part 6. A holding projection 2 is provided in the opening 8 for cooperating with the profile of the band part 6 and retaining it in the opening. Also within the opening 8 and lying opposite the holding projection is at least one guide element. The guide element comprises at least one rigidly designed knob part 3 provided with a guide track 7 for the band part 6. The guide element is located relative to the introduction direction A of the band part 6 such that it is displaced to the side and at a distance behind the holding projection 2. This causes the band part 6 to move into engagement with the holding projection 2 during insertion or attempted removal of the band part 6.

Abstract: Anionic, surface-active trehalose lipids, in which different organic acids are bound to a trehalose molecule by an ester linkage, are prepared by aerobically cultivating trehalose-producing microorganisms, capable of assimilating hydrocarbons, under growth-limiting conditions, but without limiting the oxygen.

Abstract: There is needed a process and an apparatus for the pyrolytic decomposition of halogen and/or phosphorus containing organic materials, particularly those which are radioactive, in which no corrosive secondary products, minimal amounts of waste gas, small amounts of dust and conditionable active solid waste form. This is accomplished by mixing the materials in an over stoichiometric ratio with basis compounds and introducing them from above in the form of a suspension into a fixed bed reactor which is charged with mechanically agitated substantially spherical ceramic structures.

Abstract: Material pairing for highly stresses machine parts with sliding friction between two surfaces, particularly for parallel-plate slide valves in a corrosive environment, wherein the one surface is formed by a hard cobalt alloy applied as hard-face welding, and the other surface is formed by a low-alloy, low-chromium steel which is tempered and nitrided.

Abstract: For the operation of material-test-reactors, recently there have been considered fuels having lower degrees of enrichment in U-235. For this purpose, there is needed U.sub.3 O.sub.8 powder having a crystal size of 40 to 90 .mu.m, which is producible economically and in whose production there is developed as little secondary waste as possible and a pore-free product. For this purpose, uranium compounds of the stage of oxidation +4 to +6 are calcined in an oxygen containing atmosphere whereby the calcining is carried out above 1250.degree. C. in an atmosphere containing more than 30 volume % oxygen.