Abstract: 5,15-Diaza-5b, 15b-dihydrotetrabenzo[a,g,j,p] perylene-6,16-dione, a process for the preparation thereof and its suitability for use as a pigment for coloring a wide variety of organic materials.

Abstract: The invention provides a compound of the general formula I ##STR1## in which R.sub.1 is hydrogen or methyl and R.sub.2 is C.sub.1 -C.sub.12 alkyl, preferably methyl or ethyl.

Abstract: Pearlescent coating compositions comprising a resin binder system, coated mica particles and a manganese salt of an azo pigment, these coating compositions being of particular value in two coat automotive paint systems wherein the pearlescent composition is applied as the base coat which is covered with a clear top coat to provide paint systems with intense color, high pearlescence and excellent durability.

Abstract: Esters of N,N-bis(hydroxyethyl)hydroxylamines corresponding to the formula ##STR1## wherein R are various aliphatic and aromatic groups, and X is hydroxy or substituted carboxyethyl are effective in stabilizing various organic materials against oxidative, thermal and actinic degradation.

Abstract: Substituted hydroxylamine ester stabilizers corresponding to the formula ##STR1## wherein n is 0-2, X is a direct bond, --S-- or --CH.sub.2 S--, R.sub.1 and R.sub.2 are independently hydrogen, alkyl, cycloalkyl, aralkyl, R.sub.3 and R.sub.4 are independently alkyl, cycloalkyl or aralkyl, and R.sub.5 is hydrogen or the group ##STR2## are effective in stabilizing organic materials against oxidative, thermal and actinic degradation.

Abstract: An apparatus for the detection of chemical equalization processes in aqueous solutions, in particular for the determination of pH values and/or redox potentials, is described. The apparatus, a so-called interchangeable probe, includes an essentially cylindrical probe body, with a calibrating chamber and with an immersion pipe axially displaceable in a bore of the probe body and having at its front end a protective cylinder, the area adjacent to the immersion pipe being perforated in a basket-like manner. An electrode is set into the immersion pipe with the head of the electrode being located within the basket like perforated area of the protective cylinder. An annular gap between the immersion pipe and the inner wall of the probe body is sealed by at least three gaskets, located on the inner wall of the probe body.

Abstract: An improved process for preparing dithiobisphenols comprising reacting an appropriate phenol with an alkali metal hydride, an alkaline earth metal hydride or mixtures thereof and subsequently reacting the product thereof with sulfur monochloride.

Abstract: A process for the manufacture of granules of low-melting alkyl esters containing hindered hydroxyphenyl groups which comprises introducing a melt of the compound into a cold aqueous solution of an organic water-miscible solvent, thereby obtaining free-flowing and dust-free granules.

Abstract: N-hydroxy-substituted hindered amine light stabilizers impart outstanding stabilization properties to ambient cured coatings based on a variety of resins, the stabilized coatings exhibiting improved durability, weatherability, and the like.

Abstract: Macrocyclic polyaminotriazines containing tetramethylpiperidine side groups are suitable for use as stabilisers, in particular against degradation by UV light, for polyphenylene ethers. They have the advantage that they do not impair, or impair only to an insignificant degree, the dimensional stability under heat of these polymers.

Abstract: Hindered amines based on various 2,2,6,6-tetralkylated nitrogen-containing heterocyclic moieties wherein the hindered nitrogen atom on the ring is substituted with OH or OR substituents and the 4-position of the ring is substituted with a diversity of substituents are effective in protecting a variety of non-polyolefin substrates against the adverse effects of light, heat and oxygen.

Abstract: An optical waveguide plug connection for the transmission of high continuous wave light powers from an incoming optical waveguide into an outgoing optical waveguide comprises a metallic plug housing equipped with a metallic centering element. The incoming optical waveguide and the outgoing optical waveguide project into the centering element, the end faces of the two optical waveguides being arranged opposite each other. The width of the gap is approximately in the range of from 5 to 30 micrometres. The core diameter of the outgoing optical waveguide is approximately one third larger than the core diameter of the incoming optical waveguide. The gap is filled with gas. The plug housing is connected to a housing of large surface area which dissipates heat. Using this plug connection, continuous wave powers of up to some 100's of watts in the case of visible to infrared laser light can be transmitted with a high degree of coupling without danger to the end faces of the coupling connection.

Abstract: Novel piperidine compounds of the general formula (I) ##STR1## in which m is an integer from 1 to 4, R.sub.1 and R.sub.2 are as defined in claim 1 and at least one 2,2,6,6-tetramethylpiperidinyl group, being present in R.sub.1 or R.sub.2 are useful as light stabilizers, heat stabilizers and oxidation stabilizers for organic material, especially for synthetic polymers.

Abstract: Epoxy resin systems readily available for curing by the application of an induction heat energy source comprising a silica-filled, low viscosity epoxy resin in combination with an iron oxide or a steel powder.

Abstract: A micro-flow cell for chromatographic, spectrometric or scintillation measurements comprises a capillary tube, preferably made of glass or silica glass, through which flows the medium to be examined, and a holding device for said capillary tube. The holding device is separably composed of at least two parts which can be separated in their longitudinal direction. The capillary tube is fixed in the holding device by suitably formed connectors so as to be stress-free and tension-free to the greatest possible extent.

Abstract: Apparatus whereby seeds, in particular unginned cottonseeds having lint, may be wetted with liquid active ingredients. To achieve this, the cottonseeds are separated in a feeder and metering device having conveyor screws and a baffle, and fitted uniformly into a spray chamber. In the spray chamber an atomizer produces a fine spray mist and wets the dropping seed grains. The grains drop into a mixing and transport chamber wherein they are mixed by mixer and agitator shafts. A conveyor screw transports the seed during the mixing slowly toward an inlet opening.

Abstract: In glass enamel coating compositions containing a glass frit system, a metal oxide pigment and a vehicle therefor, the improvement comprising the presence of iron metal powder to provide anti-stick, color maintenance and adhesion properties; the resulting coatings being particularly effective for application to glass sheets which are subsequently subjected to high temperature forming procedures.

Abstract: Substituted hydroxylamine ester stabilizers corresponding to the formula ##STR1## wherein n is 0-2, X is a direct bond, --S-- or --CH.sub.2 S--, R.sub.1 and R.sub.2 are independently hydrogen, alkyl, cycloalkyl, aralkyl, R.sub.3 and R.sub.4 are independently alkyl, cycloalkyl or aralkyl, and R.sub.5 is hydrogen or the group ##STR2## are effective in stabilizing organic materials against oxidative, thermal and actinic degradation.

Abstract: The invention relates to negative photoresists of the polyimide type essentially containing, in an organic solvent, in each case at least(a) one polyamide-acid or polyamide-acid derivative prepolymer which can be converted into a highly heat-resistant polyimide polymer,(b) a photoinitiator, and, if appropriate, further customary additives which contain, as the photoinitiator, a compound of the formula IR.sup.1 --SO.sub.2 --SO.sub.2 --R.sup.2 Iin which R.sup.1 and R.sup.2 are as defined.