Abstract: An electrically conductive polyethylene foam which is in the form of a profile, e.g. a sheet, having a closed cell foam structure and exhibiting a surface resistivity of not more than 10.sup.5 ohms/square. The sheet is prepared by a continuous method wherein an extruded, foamable, non-crosslinked preform containing a mixture of polyethylene, ethylene copolymer, chemical blowing agent, crosslinking agent and conductive carbon black is heated to produce the foam.

Abstract: Articulated connection between the break-open action and the at least one barrel of a rifle with two coaxial pairs of articulation members, the two articulation members (1a and 2a) of each pair complementing each other, and respectively one articulation member being provided at the break-open action (1) and, respectively, at the corresponding sidewall of the barrel (20). These articulation members (1a and 2a) exhibit a coupling profile (P1 and P2, respectively) ensuring a shape-mating connection between the break-open action (1) and the barrel (20) also transversely to the firing direction, this coupling profile permitting utilization of the axial pressure (S) produced during firing for generating a component force that is perpendicular to the aforementioned axial pressure (S) and counteracts the spreading apart of the sidewalls (1b) of the break-open action (1).

Abstract: The present invention relates to the production of molds for the casting of metal. The molds are made of refractory materials bound together by a binding agent on the basis of a partially hydrolyzed, partially condensed silicic acid ester. A slip consisting of binding agent and refractory material is applied to the model alternately with a granular refractory sanding material. In accordance with the invention, the granular refractory sanding material contains the agent for hardening the binding agent. The method of the invention makes possible the dimensionally accurate reproduction of even relatively large models, while the slip can be stored over a relatively long period of time without loss of its action.

Abstract: Solvent-free alkyl trialkoxy-silanes whose alkyl groups have 2 to 8 carbon atoms and whose alkoxy groups have 1 or 2 carbon atoms are used for the in-depth hydrophobic impregnation of concrete. Propyl and isobutyl trialkoxy-silanes display an especially deeply penetrating hydrophobizing action which is greater than that of solutions of these silanes.

Abstract: The invention relates to solutions of silanols prepared by hydrolysis of alkyltrialkoxysilanes whose alkoxy groups are partially or completely hydrolyzed.Preferred hydrolyzed alkyltrialkoxysilanes are of the formula CH.sub.3 --CH.sub.2 .dbd.CH.sub.2 --Si(OH).sub.n (OH').sub.3-n.

Abstract: A multistage arrangement for countercurrent separation of suspended solids, such as crystals, by means of hydro-cyclone groups connected in series and corresponding pumps and pump wells. For operating with relatively small expenditures with respect to apparatus under high pressures and at high temperatures within a certain, limited temperature range, the hydro-cyclone groups, the pump wells with pumps projecting into the pump wells, and the essential parts or regions of the lines are placed in a common pressure-proof and heat-insulated chamber. In addition, for removing coarser crystallizations and solid particles, an upstream classifier also accommodated in the chamber may be provided. The multistage arrangement can be used in a process for the production of terephthalic acid from dimethyl-terephthalate as the intermediate product, and in a process for the hydrogenation of coal.

Abstract: A motor vehicle door including a supportive and dimensionally stable skeleton which, together with an inner shell, constitutes a one-piece door body, to which an outer shell is attached as a separate element. The inner shell and the outer shell are fashioned from a synthetic resin and the supportive skeleton connects hinge members with the door lock of the door. The inner skin is provided with at least one of troughs or depressions and mounting bores or apertures.

Abstract: From reaction solutions of carboxylic acids prepared by carbonylation with the aid of cobalt carbonyl catalysts, the cobalt of the catalyst is precipitated by the addition of at least equivalent amounts of monocarboxylic or dicarboxylic acids and neutralization with alkaline agents, in the form of a cobalt(II) salt of the added acid, and the carboxylic acid is completely recovered from the reaction solution by acidification.

Abstract: An after-firing safety mechanism of a training ammunition that is fired through the central barrel of a full-caliber dummy projectile is described. The training ammunition includes a primer igniting an active charge upon impingement of the training ammunition on the target, as well as a locking pin ejectable perpendicularly to the axis of the training ammunition, this pin fixing the primer in place at least as long as the training ammunition is within the barrel of the dummy projectile. The locking pin is inserted in this arrangement in a cavity, to be ejectable by gas pressure. The cavity is in communication with a pyrotechnical gas generator; the latter being connected to an ignition system operating with delay. This ignition system is initiated upon firing of the training ammunition from the barrel of the dummy projectile.

Abstract: A process for producing an expanded or foamed polyolefin panel with a decorative surface wherein a polyolefin or a mixture of a polyolefin with rubber and/or a synthetic resin miscible therewith is blended homogeneously with a crosslinking agent and a blowing agent and shaped into a panel-like matrix below the decomposition temperature of the blowing agent and the activation temperature of the crosslinking agent; a film of a thermoplastic synthetic resin, imprinted in accordance with a pattern with printing ink on one surface side, is applied unilaterally or bilaterally to the matrix, with the imprinted surface side facing the matrix; and then the matrix, with the film applied, is crosslinked and expanded by heating to a temperature above the activation of the crosslinking agent and the decomposition temperature of the blowing agent.

Abstract: A break-open action for sporting rifles comprising a forward part for connection with the at least one rifle barrel, which part can be releasably locked together with a rearward part by snug seats and corresponding fastening elements, and with the rearward part containing lock mechanisms for connection with the rifle stock.

Abstract: An electric detonator device including an insulating carrier member carrying an ignition bridge and first and second electrodes connected to the ignition bridge. At least one of the electrodes is provided in the form of a layered conductor path configured to provide a high-frequency filter so as to prevent high-frequency interference signals from passing to the ignition bridge and causing misfiring.

Abstract: An inorganic, aqueous molding composition is described which can be hardened at low temperatures into molded parts having a high flexural stress at break.The molding composition is produced from electrostatic precipitator ash of high-temperature coal-burning power plants, this ash containing 45-55% by weight of vitreous SiO.sub.2 in addition to Al.sub.2 O.sub.3, or from calcined bauxite by reaction with an alkaline alkali silicate solution at a low temperature; fillers being optionally present.

Abstract: A practice ammunition system for a rocket launcher having a guide tube for receiving an original rocket, the original rocket including an ignition device which, prior to launch, performs a data exchange via at least one data line with an external fire control unit for the rocket launcher. The practice ammunition system includes a practice rocket having a rocket engine and an igniter for igniting the rocket engine thereof, the practice rocket being insertable in the guide tube of the rocket launcher, a simulator external to the practice rocket arranged for connection with the practice rocket and the fire control unit with the external simulator, after connection with the training rocket and the fire control unit, simulating functions of the ignition device of the original rocket for performing a data exchange dwith the fire control unit and for enabling launching of the practice rocket from the rocket launcher.

Abstract: An expandable molding composition for the production of a cross-linked foam material, and a process for the manufacture of the foam from a mixture of polyolefin and a selected, partially crystalline ethylene-propylene terpolymer, a blowing agent, and optionally a crosslinking agent are disclosed.

Abstract: Disclosed is a method for the production of silicon ester halides by the equilibration of chlorosilanes and silane esters. Organic phosphorous compounds are used as catalysts. These catalysts make it possible to obtain a virtually pure end product with a defined partial ester structure, and they reduce the formation of undesired by-products. The final distillation can also be performed in the presence of these catalysts without the occurrence of any disproportioning destruction of the reaction products.

Abstract: A partially combustible propellant charge igniter has a bottom piece with primer charge and an ignition gas guide tube adjoining this primer charge, with a combustible tube containing the booster charge, the internal diameter of this latter tube being larger than that of the ignition gas guide tube, and a cavity containing a separating charge between the ignition gas guide tube and the combustible tube. A communicating opening is provided between the propagation charge and the separating charge. The communicating opening comprises at least one bore in a valve bonnet, valve means being provided which, in case of excess pressure in the cavity with respect to the booster charge close the bores at least partially, so that ignition of the separating charge takes place essentially through the bore.

Abstract: A method for the preparation of 3,4-dihydro-alpha-pyrones by the thermolysis of 5-hydroxymethyl-gamma-butyrolactone in a liquid medium at temperatures between 300.degree. and 400.degree. C. and in the presence of aluminosilicates as catalysts is disclosed. The dihydropyrone that forms is distilled out of the reaction medium together with the reaction water immediately after its formation. Heat transfer oils, including, for example, polynuclear aromatic compounds joined together by methylene bridges or other bridge groupings, are especially suitable as heat transfer oils. The method has the advantage of permitting the temperature to be regulated within a definable range so that secondary reactions due to local overheating or imprecise temperature control occur to only a limited degree if at all.

Abstract: Disclosed is a process for preparing cis-trans isomer mixtures of 2,2-dimethyl-3(.beta.,.beta.-dichlorovinyl)-cyclopropane-1-carboxylic acid esters, having a high cis/trans isomer ratio, wherein a 4,4-dimethyl-5-halogen-6-alkoxytetrahydro-pyrone or a 3,3-dimethyl-4-halogen-5-oxo-pentanic acid ester is reacted with dichlorophosphonic acid esters in the presence of alkali alcoholates or alkali hydrides or lithium alkyls.Also disclosed are novel starting tetrahydropyrone compounds usable in the above process, and a process for preparation of the novel compounds which includes reacting .beta.,.beta.-dimethyl-.gamma.,.delta.-dihalogen-.delta.-valerolactones with alkali alcoholates at reaction temperatures between -10.degree. and +50.degree. C.

Abstract: Closed-cell foam molded parts or articles of crosslinked polyolefin are manufactured according to a process comprising the steps of filling a foamable and crosslinkable polyolefin composition containing a blowing agent and a crosslinking agent into a closed mold and molding a correspondingly shaped, foamable product under pressure, the crosslinking reaction progressing without decomposition of the blowing agent; subsequent heating of the resultant foamable, crosslinked product to a blowing temperature between a pair of metal plates, wherein the product can expand biaxially within the region left between the metal plates; and then heating of the thus-obtained intermediate product under low pressure of about 1 bar so that it can expand into all directions with complete decomposition of the residual blowing agent to result in the completely foamed molded part.