Abstract: Ethene homopolymers and ethene copolymers with minor amounts of higher .alpha.-monoolefins are prepared by polymerization of the monomer or monomers using a chromium trioxide catalyst which is obtained by a method in which (1) a finely divided, porous, silicate carrier is laden with (2) chromium trioxide or a chromium compound which is converted to chromium trioxide under the conditions of stage (3), and then (3) the intermediate resulting from stage (2) is heated in an oxygen-containing gas stream. In this process, a cocatalyst which consists of a lithiumalkyl used in addition to the chromium trioxide catalyst.

Abstract: In a wheel suspension for steerable rear wheels of motor vehicles, especially passenger motor vehicles, which include in a customary manner a front wheel steering system and additionally a rear wheel steering system (four wheel steering system), each rear wheel-wheel carrier is pivotally connected with the vehicle body or the like about a steering axis of rotation by way of cross guide members, which steering axis of rotation is arranged inclined in such a manner that during a deflection not only an inclined positioning of the rear wheel results but at the same time a change of the wheel camber results so that a rapid build-up of the lateral force for the lateral shift of the vehicle is achieved.

Abstract: Ethene polymerization by Phillips catalysis is carried out using (1) a supported catalyst, which is laden with chromium, phosphorus and aluminum, and (2) a cocatalyst, (1) being obtained by a method in which (1.1) a catalyst intermediate laden with chromium, phosphorus and aluminum is prepared from a silicate carrier, a selected chromium compound, a selected phosphorus compound and a selected aluminum compound, and then (1.2) the catalyst intermediate is heated in an oxygen-containing gas stream. In this process, the component (1) used is one which is obtained by a method in which, in each case in a specific manner, (1.1) in a first stage, (1.1.1) first a suspension is prepared from (1.1.1.1) a finely divided silicate carrier and (1.1.1.2) an inert organic solvent, (1.1.2) then, (1.1.2.1) in an inert organic solvent, (1.1.2.2) an organic chromium compound is combined with (1.1.2.3) an aluminum trialkyl, (1.1.3) then (1.1.3.1) the suspension resulting from (1.1.1) is combined with (1.1.3.

Abstract: In a vehicle spring system, the rear wheel spring system is constructed as active spring system and the front wheel spring system as passive spring system. The control pulses for the active rear wheel spring system are supplied from the vehicle front wheels which act as road surface sensors.

Abstract: In a wheel suspension for steerable rear wheels of motor vehicles, especially passenger motor vehicles, which include in a customary manner a front wheel steering and additionally a rear wheel steering (four wheel steering), each rear wheel-wheel carrier is connected with the vehicle body or the like exclusively by way of guide members of which one cross guide member is displaceable in the vehicle transverse direction for steering purposes by an adjusting motor and serves as support on the side of the wheel of a support spring supporting the main part of the vehicle.

Abstract: A process for the continuous preparation of finely divided homopolymers and copolymers of ethene by catalytic polymerization in a circular tube reactor using a liquid alkane as reaction medium in which the ethene or ethene/comonomer mixture to be polymerized is present in dissolved form and the polymer formed is present in suspended form and running the reaction mixture as a cycle stream to which the feed materials are added by bleeding in and from which the polymer formed is withdrawn by bleeding out reaction mixture, comprising (a) maintaining the mean concentration C.sub.m of polymer in the cycle stream at a value within a certain range and (b) effecting the bleeding out of reaction mixture at a point of the cycle stream at which the concentration of polymer has a value which is lower than the mean concentration C.sub.m by a distinct and definite amount.

Abstract: Acrylates or methacrylates I ##STR1## (A and B=C.sub.2 -C.sub.5 -alkylene, R.sup.1 =H, CH.sub.3) are prepared by reacting an acrylate or methacrylate II ##STR2## (R.sup.2 =C.sub.1 -C.sub.4 -alkyl) with a heterocycle III ##STR3## in the presence of titanium alcoholates chelate compounds of the metals titanium, zirconium, iron and zinc with 1,3-dicarbonyl compounds.

Abstract: A process for preparing titanium disulfide for use as electrode material in batteries. The starting material to be purified has an approximate composition corresponding to TiS.sub.2, a content of free sulfur greater than 0.1 weight % and/or a particle diameter d.sub.90% greater than 10 .mu.m and is dispersed in an organic liquid that dissolves sulfur but not TiS.sub.2 in a shearing device, is then separated from the liquid phase, washed, and dried with exclusion of air.

Abstract: Ethane polymers are prepared by Phillips catalysis using (1) a supported catalyst which is laden with chromium, phosphorus and titanium and (2) a cocatalyst, (1) being obtained by a procedure in which (1.1) a catalyst intermediate laden with chromium, phosphorus and titanium is prepared from a silicate carrier, a selected chromium compound, a selected phosphorus compound and a selected titanium compound, and (1.2) the catalyst intermediate is then heated in an oxygen-containing gas stream. In the process, the supported catalyst (1) used is one which is obtained (using specific methods and substances in each case) by a procedure in which (1.1) in a first stage (1.1.1), a suspension is first prepared from (1.1.1.1) a finely divided silicate carrier and (1.1.1.2) an inert organic solvent, (1.1.2) a suspension is then prepared from (1.1.2.1) a finely divided chromium trioxide and (1.1.2.2) an inert organic solvent, (1.1.3) thereafter (1.1.3.1) the suspension resulting from (1.1.2) is combined with (1.1.3.

Abstract: A rear wheel suspension for motor vehicles, especially for driven rear wheels which comprises a wheel carrier supporting the wheel, which is connected with the vehicle body by way of an upper cross guide member and two lower cross guide members. Additionally, a longitudinal arm is pivotally connected with the wheel carrier. This longitudinal arm is supported at the forward lower cross guide member between the two ends thereof by way of a connecting bearing which couples this guide member with the longitudinal arm approximately in the vertical direction but permits approximately horizontal relative movements between the guide member and the longitudinal arm. An instantaneous longitudinal center of rotation can be realized by this type of construction about which the wheel pivots during the spring compression movement whereas the real point of pivotal connection of the longitudinal arm is located considerably lower and nearer the wheel.

Abstract: A rear wheel suspension for motor vehicles with a wheel carrier supporting the wheel, with a longitudinal arm extending approximately in the vehicle longitudinal direction and connected with the wheel carrier and the vehicle body and with at least two cross guide members connected with the wheel carrier which are arranged one behind the other in plan view. Whereas the longitudinal arm is elastically connected directly with the vehicle body, the two cross guide members are pivotally connected at their ends on the body side at an auxiliary frame which in its turn is elastically connected with the vehicle body by way of rubber bushings. Unilaterally acting longitudinal forces can be absorbed elastically in the bearing without causing a significant rotation of the auxiliary frame about a vertical axis which would lead to undesired steering movements of the two wheels of an axle.

Abstract: A process for the preparation of aqueous polymer dispersions which have a low film-forming temperature but still give films having a high block resistance, and the use of these polymer dispersions as binders for coating materials.

Abstract: There are prepared compounds of the formulae ##STR1## where R is lower alkyl, chlorine, or bromine and n is an integer from 1 to 5. The compounds of formula (1) can be used to make erythro-9-(2-hydroxy-3-nonyl) hypoxanthine and its homologues and also to make the compounds of formulae (2) and (3). All three classes of compounds are useful as immunomodulators.

Abstract: There are prepared compounds of the formulae ##STR1## where R is lower alkyl, chlorine, or bromine and n is an integer from 1 to 5. The compounds of formula (1) can be used to make erythro-9-(2-hydroxy-3-nonyl) hypoxanthine and its homologues and also to make the compounds of formulae (2) and (3). All three classes of compounds are useful as immunomodulators.

Abstract: Aqueous polyacrylate dispersions having improved flow characteristics are prepared by polymerizing esters of acrylic acid and/or methacrylic acid and alkanols of 1 to 10 carbon atoms, with or without admixture of styrene and/or vinyl esters and/or water-soluble monoolefinically unsaturated comonomers (the monomer feed being in the form of an emulsion), in aqueous emulsion in the presence of a free radical polymerization initiator, a protective colloid, a nonionic emulsifier and a regulator, at least a part of the protective colloid being introduced into an aqueous initial charge, and a water-soluble regulator being employed in the initial charge and in the feed.

Abstract: The yield of 4-methyl-5-hydroxymethyl-imidazole from the known reaction between formaldehyde and 4-methyl-imidazole can be increased greatly if the reaction is performed in a concentrated aqueous medium at pH 11-13.5, preferably 12-13.5, at a temperature of 20.degree.-60.degree. C., preferably 30.degree.-40.degree. C., with an amount of formaldehyde not exceeding 1.5 mole per mole of 4-methyl-imidazole.

Abstract: A process for the preparation of 4-androstene-3,17-dione derivatives of the formula ##STR1## wherein X is 1,2-methylene or 1- or 2-methyl, comprises fermenting a sterol derivative of the formula ##STR2## wherein X is as above, the bond is a single or double bond, and R.sub.1 is the hydrocarbon residue, of 8-10 carbon atoms, of a sterol, with a microorganism culture capable of the side chain degradation of sterols.

Abstract: A process for the preparation of 4-androstene-3,17-dione derivatives of the formula ##STR1## wherein X is 6,7-methylene or fluoro, chloro, or methyl in the 6- or 7-position, comprises fermenting a sterol of the formula ##STR2## wherein X is as above and R.sub.1 is a hydrocarbon residue of 8-10 carbon atoms with a microorganism culture capable of degrading the side chain of a sterol.

Abstract: A process for the preparation of androstane-3,17-dione compounds of the formula ##STR1## wherein X is 1,2-methylene or 1- or 2-methyl, comprises fermenting a sterol of the formula ##STR2## wherein X is as above and R.sub.1 is the hydrocarbon residue of 8-10 carbon atoms, of a sterol, with a microorganism culture capable of effecting the side chain degradation of sterols.

Abstract: Means for removing deposits formed due to foaming, etc., on the inner walls of a liquid reaction vessel which contains agitating means. Dispersing means are provided attached by arm means to the shaft of the agitator, which are adapted to engage the surface of the reaction mixture, and on increased rotation of said agitator shaft will spray or fling liquid reaction mixture onto said inner walls. The dispersing means can be curved tubular members, channel members, angled plates, paddles, etc. In one embodiment, the dispersing member is spring-biased, normally not engaging said liquid surface, and which will engage said liquid surface upon increased rotational speed.