Abstract: The invention relates to an improved process for the manufacture of magnetic discs carrying very thin magnetic layers, by applying a fluid dispersion of magnetic materials in a binder mixture to rigid base discs by the spin-coating process. Above the side of the base disc which is to be provided with the magnetic layer, there are arranged means which produce an aerodynamic boundary layer above the discs during rotation of the latter. This avoids the formation of surface irregularities and of coating streaks during production of the layer by spin-coating.

Abstract: A technique for the manufacture of a resin-impregnated, reinforced article while resin fumes are prevented from escaping into the surrounding atmosphere.

Abstract: An apparatus for treating photopolymer printing plates, which have already been exposed, with liquid media, in which the plate, mounted on a vertically movable holder, can be moved up and down between an upper loading and unloading chamber and a lower treatment chamber, separated from the upper chamber by a partially open partition, and in which upper and lower rim elements of the plate holder seal the aperture in the partition in a vapor-tight manner when the plate holder is in its terminal positions.

Abstract: A color video tape recording/playback system with a magnetic tape unit and possibly a color video camera comprises at least one signal storage means, e.g. a charge-coupled device (CCD), for the intermediate storage of the video information, thus enabling the recording to be carried out with a reduced bandwidth or at a reduced tape speed and, if applicable, with a reduction of time base errors. Skip line or skip field methods are used or the grouping of several lines is exploited. The reduction of time base errors during playback is achieved by clocking out the stored signal from the charge-coupled device at the rhythm of the tape speed fluctuations in the tape recorder.

Abstract: Photopolymerizable coating compositions contain, as the binder, olefinically unsaturated compounds having a boiling point above 50.degree. C, together with from 0.5 to 15% by weight of photoinitiators, based on the binder. The photoinitiators are a mixture of an aromatic carbonyl compound A, which is a derivative of benzoin or benzil, which has at least one carbon-oxygen single bond in the .alpha.-position relative to the carbonyl group, an aromatic carbonyl compound B which is derived from benzophenone, fluorenone, anthraquinone, xanthene, thioxanthone or acridone, and an amine C of the general formula ##STR1## where R', R" and R"' are H, alkyl of 1 to 10 carbon atoms, cycloalkyl of 3 to 10 carbon atoms, aryl, hydroxyalkyl of 1 to 8 carbon atoms or alkoxyalkyl of 2 to 4 carbon atoms, but at most 2 substituents are H and at most 2 substituents are aromatic.These coating compositions may be used for finishing various substrates, as fillers or as printing inks.

Abstract: A receiver for radio signals, comprising an r-f (radio-frequency) unit and an a-f (audio-frequency) unit, the circuit in the a-f unit being interrupted at certain points and the receiver being devised electrically and with respect to its spatial design in such a way that, by changing modules accommodated within the spatial confines of the receiver case, completely different technical versions of the receiver are obtained.

Abstract: A process for the separation of rhodium from a solution containing a rhodium carbonyl complex such as is obtained in the carbonylation of an alkanol or of an olefinically or acetylenically unsaturated compound with carbon monoxide and water and conversion of the separated rhodium into a soluble rhodium carbonyl complex, in which the solution containing the rhodium carbonyl complex is treated with hydrogen in the presence of a carrier substance at a temperature of from 25.degree. to 300.degree. C and at a pressure of from 1 to 700 atmospheres, the solution freed from rhodium is separated and the rhodium precipitated on the carrier is converted into a soluble rhodium carbonyl complex by treatment with carbon monoxide in the presence of a solvent and a compound which can replace the carbon monoxide as a ligand at a temperature of from 20.degree. to 300.degree. C and at a pressure of from 1 to 700 atmospheres.

Abstract: A container for a cassette containing a recording tape which container consists of a hollow portion, a support for the cassette and a lid portion. The design of the support and lid portion and the hinged connection between the same and the hollow portion are such that in the closed position of the container the latter is closed on all sides while in its open position the cassette is held securely but is readily removable.

Abstract: New sulfamic acid halides and a process for their manufacture by reacting N-(.alpha.-haloalkyl)-sulfamic acid halides with alcohols. The products are starting materials for the manufacture of crop protection agents, dyes and pharmaceuticals.

Abstract: Yarn spinning machinery and process utilizing a pair of perforated sieve belts, cylindrical sieve drums or hyperboloid sieve drums for twisting staple fibres at a line of yarn formation wherein the sieve members are moving in opposite directions while air currents are drawn through the sieve members on opposite sides of, and in opposite, twist-assisting flow directions, the line of yarn formation.

Abstract: New and valuable diurethanes of the formula ##STR1## where R denotes lower alkyl, X/Y denote the combination fluorine/fluorine, fluorine/chlorine or chlorine/fluorine, and processes for controlling the growth of unwanted plants with these compounds.

Abstract: Pyrazoline compounds of the formula (I): ##STR1## in which EACH OF B.sup.1 to B.sup.5 is hydrogen or C.sub.1 to C.sub.4 alkyl;R.sup.1 is hydrogen, alkyl or hydroxy;R.sup.2, r.sup.3, r.sup.5, r.sup.6 and R.sup.7 independently of one another are hydrogen, chloro, bromo, fluoro, methyl, ethyl, methoxy or ethoxy;R.sup.4 is hydrogen, alkyl, benzyl, phenylethyl or also phenyl optionally bearing chloro, bromo, methyl, ethyl, methoxy, ethoxy, cyano, dialkylamino or SO.sub.3 H as a substituent;X is --O--, --S--, --NR.sup.8 --, --NR.sup.8 CO--, --NR.sup.8 --SO.sub.2 --, --OSO.sub.3 -- or --SO.sub.3 --;R.sup.8 is hydrogen, alkyl or alkyl bearing hydroxy or C.sub.1 to C.sub.4 alkoxy as a substituent;A is hydrogen, sodium, potassium, unsubstituted or substituted ammonium, unsubstituted or substituted alkyl, cycloalkyl, aralkyl or aryl; and--NR.sup.8 -- and A together may be an optionally quaternized saturated or unsaturated heterocyclic ring.

Abstract: New and valuable pyrocatechol derivatives and a process for their preparation. The pyrocatechol derivatives have the formula ##STR1## wherein: R denotes alkyl of from 1 to 4 carbon atoms which may be substituted with halogen; alkenyl having up to 4 carbon atoms which may be substituted with halogen; alkynyl having up to 5 carbon atoms which may be substituted with halogen; or benzyl;R.sup.1 denotes hydrogen or alkyl of from 1 to 4 carbon atoms;R.sup.2 denotes benzyl or alkyl of from 1 to 3 carbon atoms which may be substituted with halogen, methoxy or ethoxy;R.sup.3 denotes alkyl of from 1 to 4 carbon atoms; cycloalkyl of from 3 to 7 carbon atoms; .beta.-chlorethyl; methoxyethyl; ethoxyethyl; alkenyl of from 2 to 4 carbon atoms; alkynyl of from 2 to 4 carbon atoms; acetyl; propionyl;R.sup.1 and R.sup.2 when taken together with the carbon atom to which they are attached form a cyclopentyl or cyclohexyl ring; andR.sup.1 and R.sup.

Abstract: Process for the manufacture of styrene polymers optionally containing blowing agent by polymerization in aqueous suspension using as the suspension stabilizer a calcium phosphate which after its manufacture by precipitation has been heated in aqueous dispersion for at least 2 hours at from 70.degree. to 130.degree. C. The styrene polymers may be used for the manufacture of foams.

Abstract: A process for the manufacture of rigid magnetic recording media by depositing a cobalt-containing ferromagnetic metal layer on a non-magnetic metallic base disc provided with a cured layer of binder which does not dissolve or swell in organic solvents and contains non-magnetic pigments, and which has been activated, before deposition of the ferromagnetic layer, by treatment with a solution of a palladium (O) complex in an organic solvent, followed by decomposition of this complex, to prepare it to receive the ferromagnetic metal layer which is produced by electroless deposition.

Abstract: The invention relates to baking finishes of low solvent content, consisting essentially of an acrylate resin, an epoxy resin and a mixture of organic solvents, with or without pigment, catalyst and other conventional auxiliaries, in which the acrylate resin is a copolymer which contains from 10 to 35% by weight of .alpha.,.beta.-olefinically unsaturated carboxylic acids as copolymerized units, has a very low K value and has an acid number of from 70 to 250 mg of KOH/g, the epoxy resin contains at least 2 oxirane groups per molecule and the mixture of organic solvents is a mixture of from 20 to 80% by weight of a solvent having a boiling point of from 100.degree. to 280.degree. C and a dielectric constant of from 2 to 4.99, and from 80 to 20% by weight of a solvent having a boiling point of from 80.degree. to 200.degree. C and a dielectric constant of from 5 to 27. The weight ratio of acrylate resin to epoxy resin is from 9:1 to 6:4.These baking finishes of low solvent content may be used, e.g.

Abstract: An apparatus for the mixing of materials such as synthetic polymers and their additives. The apparatus comprises a casing which surrounds a cylindrical rotor. A series of groove rings and spacer rings are axially arranged on the rotor and in the casing. The grooves formed on the peripheral surface of the groove rings are circumferentially separated by shearing lands and are bound along their longitudinal side faces by the side faces of the alternately arranged spacer rings. In assembly, the grooves formed in the rotor groove rings are arranged in a partially overlapping, axially displaced relationship with respect to the radially opposed grooves formed on casing groove rings.

Abstract: The invention is directed to a tape transport mechanism for recording and playing back video signals comprising a contact winding mechanism with tape-guiding means at the capstan and a magnetic tape in which the substrate is a polyethylene terephthalate film. The coated side of the tape, during transport, is in contact with the guide surface of the guide means, and no part of the transport mechanism at which slip could occur during the tape transport is allowed to be in contact with the tape substrate. The tape is wound with its substrate on the inside and its coated side is preferably abrasive with respect to the guide surface, which latter may advantageously consist either of steel or a ceramic material. The bonding agent of the magnetic dispersion -- preferably a chromium dioxide dispersion -- may be prepared from a polyurethane/polyvinyl chloride mixture which imparts the desired hardness to the tape.

Abstract: Solutions of nitrosylsulfuric acid in sulfuric acid are manufactured by reacting nitric acid with sulfur in sulfuric acid or oleum. Less than 0.33 gram atom of sulfur is employed per mole of nitric acid, and after completion of the reaction the free nitric acid still present in the nitrosylsulfuric acid solution is reduced with lactones.

Abstract: A process for the continuous manufacture of organic monoisocyanates, diisocyanates and/or polyisocyanates from the corresponding organic amines and phosgene in the presence of inert organic solvents, with recycling of the reaction mixture, wherein the streams of liquid, consisting of the recycle stream and the amine feed solution, are fed to the reaction mixture at a rate such that an energy dissipation density of from 5 to 1,000 kJoule per m.sup.3 of recycled reaction mixture plus amine feed solution is generated in the mixing and reaction zone.