Abstract: A shaft seal containing magnetic liquid, for pump shafts or the like, consists of a permanent magnet which surrounds the shaft and is a distance away and one or more pole pieces connected to the said magnet. The pole piece, together with the shaft surface, forms an air gap in which the magnetic liquid is held by the magnetic field, so that a liquid sealing ring is produced. A volume of gas located between the magnetic liquid seal and the shaft channel to the medium prevents the magnetic liquid from coming into contact with the medium.

Abstract: A process for the preparation of ferrite powders which have a particle fineness which can be set to a defined value, of the general compositionM(II).sub.x Fe(II).sub.1-x Fe(III).sub.2 O.sub.4andM(II).sub.x Fe(III).sub.3-x O.sub.4.5-0.5xwhere M is Mg, Mn, Co, Ni, Cu and/or Zn and x is from 0 to 1, and have an essentially isotropic particle shape.

Abstract: An information disk store possesses an air circulation system in a substantially sealed housing, by means of which system, which includes a channel for directing air to the end of the hub on which the disks are mounted, and a low-pressure compartment that is shut off from the disk compartment by a main filter, a first positive pressure gradient from the bottom to the top of the housing is set up in the peripheral space adjacent to the disks. It is advantageous to also set up a second positive pressure gradient in the direction of rotation of the disks, in the peripheral space adjacent to the disks. The novel air circulation system can be used with advantage in all information disk storage systems in which the write and read operations may be adversely affected by dust and dirt.

Abstract: Diarylide yellow pigment compositions which are sulfonated with 2,2'disulfobenzidine and/or p-sulfo-acetoacetanilide are rendered hydrophobic by treatment with specific quaternary ammonium salts. The pigment compositions are easily flushed into flushed bases. When incorporated into printing inks, the pigments demonstrate improved color strength and transparency.

Abstract: Finely divided, agglomerated crude polyhalo-copper phthalocyanine is recrystallized (conditioned) by heating the crude pigment with benzoic acid, toluic acid, ethylbenzoic acid or a mixture of these, in the presence of water, at from 80.degree. to 130.degree. C.The resulting polyhalo-copper phthalocyanine pigments are readily dispersible and of high color strength, and pigmentary forms ranging from transparent to high-hiding can be obtained in a selective manner.The carboxylic acids used as conditioning media can readily be recovered by acidifying the mother liquor.

Abstract: Stabilizers consisting of (a) 2,5,7,8-tetramethyl-2-(2'-stearyloxyethyl)-chroman and (b) glyceryl stearate, glyceryl hydroxystearate, partial esters of stearic acid with condensates of glycerol and trimethylolpropane, triglyceryl stearate and/or tetraglyceryl stearate, with or without further conventional additives, the weight ratio of (a) to (b) being from 10:1 to 1:10, give improved stabilization to discoloration and superior stability during processing when used in plastics such as polyethylene or polypropylene.

Abstract: Fluorophthalimides are prepared by a process in which a fluorophthalic anhydride is reacted, in the presence of an aliphatic sulfone, with from 0.4 to 0.8 mole of urea per mole of fluorophthalic anhydride, and the reaction is carried out first at 110.degree.-140.degree. C. and then at 150.degree.-170.degree. C.

Abstract: O-substituted 3-oxypyridinium salts of the formula ##STR1## where R.sup.1 is unsubstituted alkyl, alkenyl or alkynyl, or is aralkyl, R.sup.3 is hydrogen, alkyl, alkenyl or alkoxy, R.sup.2 is substituted or unsubstituted alkyl, alkenyl or alkynyl, or is aralkyl, and X.sup..crclbar. is an anion, and fungicides for crop protection containing these compounds.

Abstract: Spring elements, as brake and tape tensioning elements, are provided with two or more locking elements having a predetermined difference in length. The devices of which various embodiments are disclosed can be advantageously used for tape cassettes of any type possessing reel brakes, and in particular for small cassettes.

Abstract: N-(Azolylcarbamyl)-hydroxylamines of the formula ##STR1## where R is unsubstituted or substituted alkyl, alkenyl, alkoxyalkyl or cycloalkyl, or unsubstituted or substituted phenyl, phenylalkyl, phenylalkenyl or phenoxyalkyl, R.sup.1 is alkyl, alkenyl, alkoxyalkyl, alkylthioalkyl, cycloalkyl, cycloalkylalkyl or unsubstituted or substituted benzyl, Y is CH or N and R.sup.2 and R.sup.3 are each hydrogen or alkyl, and fungicides which contain these compounds.

Abstract: In a tape cassette having a mounting for a leg spring, in particular a brake spring in a tape cassette, the spring is held partly or completely either at the inner periphery or at the outer periphery, so that the brake element and the spring form a unit which can be preassembled and in which the spring is held so that it cannot be lost.

Abstract: This invention relates to a gel composition comprising water, mineral oil and two polyoxyethylene-polyoxybutylene block copolymers designated copolymer A and copolymer B wherein said block copolymers are cogeneric mixtures of conjugated polyoxybutylene-polyoxyethylene compounds containing in their structure oxybutylene groups, oxyethylene groups and an organic radical derived from a water-soluble organic compound containing a plurality of reactive hydrogen atoms and 2 to 12 carbon atoms wherein copolymer A has a molecular weight of the polyoxybutylene portion of at least about 1800 and the polyoxyethylene portions contribute from about 60 to 80 percent by weight of the compound and copolymer B has a polyoxybutylene portion with a molecular weight of at least about 600 and the polyoxyethylene portion contributes from about 20 to 40 percent by weight of the compound.

Abstract: An apparatus for entangling filamentary yarns comprises first and second blocks which are positionable in mutually superimposed relationship. Each block includes a plurality of channels and a plurality of fluid ports. The channels are located so that when the blocks are in superimposed relationship, respective ones of the channels are aligned to define yarn passages through which yarns can be fed. The fluid ports communicate with the yarn passages and are communicable with pressurized fluid to create a turbulent fluid flow within respective ones of the yarn passages for entangling the yarns. A motor actuated mechanism separates the first and second blocks to provide simultaneous and immediate access to the interior of the yarn passages. When the blocks are separated, the yarns can be continually fed therethrough to pull trash through the yarn passages. Each block includes a base section and a head section removably attached thereto.

Abstract: 2-Methyl-2-alkenals of the formula ##STR1## where R.sup.1 and R.sup.2 are each hydrogen, alkyl which may additionally carry aromatic radicals, or an aromatic radical, are prepared by isomerizing a 2-alkylacrolein of the formula ##STR2## in the presence of hydrogen and of a catalyst which contains palladium and an oxide or salt of a rare earth metal as active components, at from 20.degree. to 120.degree. C. and under from 1 to 100 bar.

Abstract: A positive interlocking arrangement between two container parts connected pivotably by a joint essentially consists of circular edges in side walls of one part of the container and grooves which are provided in the circular edges and which are engaged by counter-pieces on the other container part which are in the form of sloping surfaces or steps. The container parts can be separated only in the region of a predetermined angle of rotation, in particular in the vicinity of the closed position of the container. Provisions for limiting rotation can advantageously be combined with the interlocking devices. The positive interlocking arrangement can be used for any container which consists of rectangular molded components essentially connected pivotably to one another.

Abstract: The invention relates to elimination of discoloration in polyurethanes, particularly thermoplastic polyurethanes, by the addition to the reaction mixture from 0.

Abstract: The subject invention relates to acidizing concentrates used to prepare acidizing systems for oil and gas recovery. The additives comprise:(a) a C.sub.4 -C.sub.12 aliphatic alcohol, and(b) a polyether nonionic surfactant having the following structural formula: ##STR1## wherein R is the residue of an aliphatic alcohol having 2 to 10 carbon atoms resulting from the oxyalkylation of a corresponding aliphatic alcohol having a functionality equal to n, and n has a value of 2 to 3; and wherein X and Y are numbers such that the ratio of X to Y is from 8:1 to 0.31 in the total molecular weight of the molecule is from 1,000 to 15,000.

Abstract: Compounds of the general formula I ##STR1## wherein R.sup.1 is hydrogen, fluorine, chlorine or bromine, R.sup.2 is hydrogen, fluorine, chlorine, bromine, or nitro, B is aliphatic or a sulfo-substituted phenylene radical, and X is a dye radical, are useful for dyeing hydroxyl-containing textile material, in particular cotton.

Abstract: Stabilized water-containing sodium dithionite formulations which have been rendered alkaline have the consistency of a pumpable paste. They additionally contain readily soluble sodium salts and/or potassium salts which are inert to sodium dithionite and whose water-solubility at 20.degree. C. exceeds 500 g/l. These salts are present in the aqueous phase in an amount of not less than 200 g/l. The pastes are useful reducing agents.

Abstract: Essentially phenol-free phenol resol ethers which are bonded via o,o'-methylene ether groups are prepared by a process in whichA. where the process is carried out beginning with the methylolation in an aqueous medium, the methylolation is carried out in the presence of 0.5-10% by weight, based on the phenol employed, of Me.sup.++ ions, the latter are then removed as a sparingly soluble salt, the water present as a solvent in the reaction mixture is removed at 30.degree.-80.degree. C. in the presence or absence of one or more monohydric, dihydric or trihydric alcohols and an entraining agent, and the water of reaction formed during the etherification is separated off at 45.degree.-120.degree. C., andB. where the process is carried out beginning with the methylolation in a non-polar organic solvent, the methylolation is carried out in the presence of 0.1-0.3% by weight, based on the phenol employed, of Me.sup.++ ions, the etherification is effected at 95.degree.-120.degree. C.