Abstract: A process for the preparation of an aminoacetaldehyde acetal of the formula ##STR1## wherein R is a saturated branched or unbranched alkyl radical of 1 to 4 carbon atommsBy contacting a dialkoxyacetonitrile of the formula ##STR2## wherein R has the same meaning with hydrogen at an elevated pressure and at a temperature of 50-180.degree. C., preferably in the presence of a catalyst and preferably in the presence of ammonia.

Abstract: Production of cellulose derivatives substituted by groups having functional moieties by reaction of a hydroxyl group(s) of the cellulose with an at least bifunctional reagent. The reagent is reacted with cellulose dissolved in dimethylsulfoxide containing polyhydroxymethylene.

Abstract: Compounds of the formula: ##STR1##The compounds can be produced by reacting the corresponding 4,4'-bis-(halogenmethyl)-ar-octahalogendiphenylethers with at least 2 moles of alkali acetate or formiate in the presence of alcohol as transesterification agent and solvent. The compounds are useful as intermediates for the production of insecticides, herbicides or hydrophobizing agents.

Abstract: An improvement in an unsaturated polyesters having recurring units of the formula ##STR1## wherein A is the residue of an alcoholic moiety and B is the residue of an acid moiety, which improvement resides in the fact that some of the A residues are chloroxylylene containing residues having the formula ##STR2##

Abstract: A training projectile having an auxiliary drive mechanism for counteracting the aerodynamic resistance to which the projectile is exposed during the training flight phase of projectile travel. The auxiliary drive mechanism preferably is in the form of a rocket or jet drive. The training projectile is also provided with a mass so that the ratio of the resultant axial force to the mass of the training projectile is at least approximately equal to the ratio of the resistance force to the mass of a corresponding live projectile during the training flight phase.

Abstract: A self-supporting molded headliner for use in the inside of automobile roofs is formed of a layered composite arrangement or construction of polyethylene foam panels laminated or otherwise secured on both sides to at least one reinforcing layer of rigid paperboard, for example, corrugated cardboard or carton material.

Abstract: Production of chloroacetaldehydedimethyl acetal by the reaction of a vinyl halide with chlorine and methanol in contact with an acid binding material in an approximately anhydrous system. Co-produced dichloroethyl, methyl ether is also disclosed.

Abstract: A polymer having as a component thereof a moiety corresponding to a monomer having the following formula ##STR1## WHEREIN N = 0 OR 1, X is bromine, chlorine or a mixture thereof and R represents hyrogen or methyl, a method of preparing the same and the use of such a polymer, including a copolymer thereof in a plastic composition containing a normally flammable plastic.

Abstract: A short-range projectile for practice ammunition having an axial air inlet duct emanating from the front end of the projectile and at least one outlet duct connecting the inlet duct with the jacket of the projectile. At least one of the inlet and outlet ducts are blocked during the initial flight path of the projectile by a blocking member displaceable in a chronologically controlled manner. The blocking member is displaceable in response to an air pressure head occurring during flight of the projectile from a starting position for preventing the influx of air from the inlet duct to the outlet duct to a final position wherein communication and influx of air from the inlet duct to the outlet duct is completely enabled.

Abstract: A process for extruding patterned sheets or panels of differently colored thermoplastic synthetic resin compositions which include the steps of distributing additional color compositions outside of an extrusion duct of a basic color composition over a number of individual feed channels and introducing the additional color compositions at right angles to the direction of flow of the basic color composition into the interior of the stream of the basic color composition at locations over the width and thickness in an initial flow zone via said channels.

Abstract: A non-swellable three-dimensional polymer having a component which is a residue of an optically active compound, which residue is chemically removable from said polymer to leave behind in the physical structure of said polymer a void corresponding to the size and shape of said residue of optically active compound, and a particular steric arrangement of functional groups within the void of said polymer corresponding to the chemical structure of said residue of optically active compound, the original polymer having recurring units of the formulas ##STR1## wherein A, C and D are residues bonded to B of compounds which residues are polymerizable or polycondensable and B is a residue of an optically active compound; a process for preparing such polymer and the form of such polymer containing such void and free of the residue of optically active compounds.

Abstract: A process for producing dimethyl terephthalate from high-boiling tarry residues from the combined oxidation of p-xylene and p-toluate in the liquid phase, esterification of the resulting acids with methanol and separation of the resulting dimethyl terephthalate which include the steps of subjecting the high-boiling residues to treatment with methanol at temperatures above 250.degree. C. and thereafter separating the resulting dimethyl terephthalate in accordance with conventional separation techniques.

Abstract: Forming tool comprising a shaped structure that is porous and air-permeable and that is made from a reactive resin and at least one inert filler.

Abstract: Process for the production of terephthalic dialdehyde by hydrolysis of .alpha.,.alpha.,.alpha.',.alpha.'-tetrachloro-p-xylene, which comprises contacting .alpha.,.alpha.,.alpha.',.alpha.'-tetrachloro-p-xylene and steam in a reaction zone at a temperature and for a time sufficient for hydrolysis of the .alpha.,.alpha.,.alpha.',.alpha.'-tetrachloro-p-xylene to form said dialdehyde.

Abstract: A process for reducing the shrinkage of profiled elements of thermoplastic synthetic resins, which normally occurs due to undesired stresses frozen in during extrusion in an extruder die and calibration in a calibrating device, involves the step of maintaining the extrusion speed of the profiled element upon exiting from the extruder die at least the same or almost the same as the calibrating speed and/or take-off speed of the profiled element during its subsequent passage through the calibrating device. Also, it is advantageous to cool selected and defined portions of the periphery of the extrudate during the initial stage of calibration within the calibrating device so that a reinforced frame or corset is formed within the extrudate.

Abstract: A process for the preparation of an aqueous alkali metal polysilicate solution having an SiO.sub.2 : alkali metal oxide mole ratio of 2.5 - 5.5 : 1 and a silica content of 16 - 23% by weight which comprises contacting a tetraalkoxysilane of the formula Si(OR).sub.4 wherein each R is independently a straight or branched-chain alkyl group of 1 to 3 carbon atoms with an aqueous alkali metal hydroxide solution at a temperature between room temperature and the boiling point of the reaction mixture and at a temperature up to 100.degree. C. distilling over alcohol formed by the reaction of the silane with the alkali metal hydroxide.

Abstract: A polymeric formal having the general formula ##STR1## wherein p is 0 or 1, n is a positive integer from 2 to 200 and R represents optionally halogen-substituted straight-chained or branched-chained alkyl radicals having 3 to 8 carbon atoms, an aryl radical or an aralkyl radical which can be substituted on one or both sides with alkyl or hydroxyalkyl ether groups; improved methods for the preparation of such formals, tetrabromoxylylene-bis-(.beta.-hydroxyethylether) compounds employed in the preparation of such formals and the use of such polymeric and oligomeric formals as flame retardant agents in plastic compositions especially thermoplastic and polycondensation plastic compositions.

Abstract: A process for mass transfer between heterogeneous systems or phases in a vertical exchange column having at least one plate, a heavier stream of matter being introduced above the plate and, a lighter stream of matter being introduced countercurrently thereto from the bottom of the plate, wherein (a) a heavier stream of matter fed from the top is deflected, above the plate, into a mixing zone in which the heavier stream undergoes vertical rotary movement and is mixed with a lighter stream of matter passing from below through a first passgeway of the plate and introduced into the mixing zone to also undergo vertical rotary movement, (b) a heavier phase, suspension, or the like fluid-like mass forming in the mixing zone during the mass transfer therein is accumulated in a zone superjacent to a second passageway of the plate; and (c) after a sufficient pressure gradient has been built up, the accumulated mass flows as another heavier stream through the second passageway into a space underneath the plate and is at

Abstract: Iron is removed from grits, e.g. crushed corundum by contacting the grits with aqueous hydrochloric acid for dissolving of the iron and provision of a suspension of the grits in the acedic aqueous medium; water is added to the suspension and it is then centrifuged; water is added to the grit-rich fraction and the resulting suspension is subjected to a second centrifuging step.

Abstract: A laminate comprising an inorganic oxidic or metallic surface and a polymer, the laminate having in the region of the interface between inorganic oxidic or metallic surface and the polymer a silane having a capped function group; the use of silanes having capped functional groups as adhesivizing agents especially for use between organic polymers and substances having inorganic oxidic and/or metallic surfaces. Also disclosed is the surface of an inorganic oxidic or metallic surface resistive to corrosion by applying thereto a silane having a capped functional group.