Abstract: Process for the manufacture of .alpha.-hydroxycarboxylic acid amides by adding water onto cyanohydrins in an aqueous medium containing 10-60% by weight of the oxo compound on which the cyanohydrin is based, with the aid of a catalyst dissolved in the reaction medium and selected from the group consisting of alkali metal-, alkaline earth metal- and alkylammonium salts of boric acid, at a pH from 7-11.

Abstract: A storage-stable lacquer resin which can be baked without yellowing at a low baking temperature, and is based on an alkyd resin, acrylic resin or epoxy resin, is obtained by reacting the resin with a bis- or tris-alkoxyalkylamino-s-triazine which has been obtained by heating a triazine derivative of the general formula: ##STR1## wherein X is an alkyl group having 1 to 4 carbon atoms, a phenyl group or the group ##STR2## and each of R and R' is an alkyl group radical having up to six carbon atoms, at 100.degree. to 200.degree. C. up to a weight loss of 3 to 25%, preferably 5 to 15%.

Abstract: Production of foamed plastics with improved combustion characteristics by condensing aqueous solutions of aminoplast precondensates with at least bifunctional organic isocyanate whereby an acid curing catalyst and an accelerator for polyurethane formation is used. For performing the condensation, the aqueous solution of the precondensate is added to the mixture of isocyanate and the accelerator at the same time as but separately from the acid curing catalyst.

Abstract: Foamed plastics with improved combustion characteristics and good mechanical strength are obtained by condensation of aminoplast precondensates with organic isocyanates in the presence of an acid curing catalyst and an accelerator for polyurethane formation, whereby the precondensate used as starting material is prepared by reacting formaldehyde with urea and/or melamine in a molar ratio of 1.80 to 4.5:1 at pH values of 4 to 9.5, adjusting then the pH to 7.0 to 8.0 and adding urea to obtain a molar ratio offormaldehyde to the total amount of aminoplast forming compound of 1.0-2.1:1.

Abstract: N-acyl derivatives of 3-amino-2,4,6-triiodobenzoic acid having the formula ##STR1## in which R.sub.1 is hydrogen, alkyl of up to 4 carbon atoms, alkoxyalkyl of 2-5 carbon atoms or alkoxyalkoxyalkyl of 3-8 carbon atoms, R.sub.2 is alkylene of up to 5 carbon atoms, R.sub.3 is alkylene of up to 3 carbon atoms, R.sub.4 is alkyl of up to 6 carbon atoms, X is straight chain or branched alkylene with two or three carbon atoms in the main chain and n is 0, 1 or 2 and the pharmaceutically acceptable salts thereof, which are useful as X-ray contrast media for intravenous cholecystographie.

Abstract: 3-Methoxy-4-(4'-aminobenzenesulphonamido)-1,2,5-thiadiazole is prepared by reaction of 3-methoxy-4-chloro-1,2,5-thiadiazole with sulfanilamide in dimethylsulfoxide as solvent and in the presence of alkali hydroxides or carbonates using a reaction temperature of from ambient temperature to 95.degree. C., whereby per mole of thiadiazole-compound from 1.2 to 1.5 mole of sulfanilamide and from 1.5 to 3 moles of the alkali hydroxide or carbonate are used, whereafter the reaction product is obtained by acidification.

Abstract: Novel Arylaminoimidazoline derivatives of the formula ##STR1## in which R.sub.1 and R.sub.2 are chlorine, bromine or an alkyl group with 1 to 4 C atoms, R.sub.3 is hydrogen or an alkyl radical with 1 - 4 C atoms and n and m each represent an integer from 1 to 3, the sum of n + m being an integer from 2 to 5 inclusive, and their salts. This novel compounds have a pronounced analgesic action.

Abstract: Foamed plastics with improved combustion characteristics are produced by condensing an aqueous solution of formaldehyde-urea and/or melamine precondensates with polyisocyanates and optionally a polyol in the presence of an acid catalyst, being present in an amount of 1 part by weight per at least 20 parts by weight of precondensate, whereby this catalyst is added to the isocyanate before mixing with the precondensate or to the mixture of isocyanate and precondensate, but separately from the precondensate.

Abstract: Pure, concentrated ammonia is recovered from aqueous liquors by stripping off gas water, de-acidifications, scrubbing and withdrawing ammonia from the top of a scrubbing column.

Abstract: Amine salts of 3-phenyl-6-halo-4-hydroxypyridazines of the formula: ##STR1## in which X is a chlorine or bromine atom, R.sub.1 is an alkyl group containing up to 14 carbon atoms, which group may be substituted by a hydroxy group, an alkoxy group containing up to 10 carbon atoms, cyano group, amino group or lower mono- or lower dialkylamino group, an alkenyl group containing up to 6 carbon atoms or a cycloalkyl group containing 5, 6 or 7 carbon atoms, and R.sub.2 and R.sub.3 have the same meaning as R.sub.1 or each is a hydrogen atom, or R.sub.1 and R.sub.2 together with the nitrogen atom of the amine form a 5- or 6-membered heterocyclic group which may also contain oxygen and which may be mono- or di- substituted by alkyl, and herbicidal compositions containing them.

Abstract: A process for the preparation of raw mix for the production of cement and sulphuric acid by the cement-sulphuric acid process, which mix comprises calcium sulphate, coke and other additives, by separate grinding of the materials used, which comprises grinding the coke alone to a degree of comminution corresponding to a grain size spectrum, by weight, of<60 .mu. 25 to 40%60 to 90 .mu. 8 to 15%>90 .mu. 45 to 70%and then mixing the ground coke with a finely ground mixture of calcium sulphate and the remaining additives, and the use of such raw mix in the production of cement and sulphuric acid.

Abstract: Phenoxypropylamine derivatives of the general formula: ##STR1## in which R is a hydrogen atom or a straight-chain or branched alkyl group containing up to 10 carbon atoms, R.sub.1 is a hydrogen atom, a straight-chain or branched alkyl group containing up to 10 C atoms or a cyclopentyl, cyclohexyl, benzyl or phenyl group or R and R.sub.1 taken together form a pentamethylene-(1,5), tetramethylene-(1,4), 2-azapentamethylene-(1,5), 3-azapentamethylene-(1,5) and 3-oxapentamethylene-(1,5)-group, R.sub.2 is an alkyl group containing up to 6 carbon atoms or a benzyl or phenyl group and R.sub.3 is a branched alkyl group containing 3 to 6 carbon atoms, a cyanoalkyl group containing up to 6 carbon atoms or a cycloalkyl group containing 3 to 7 carbon atoms, and pharmaceutically-acceptable salts thereof, having a cardio-selective .beta.-blocking action.

Abstract: A process for purifying waste gypsum from the wet phosphoric acid process to a maximum fluorine content of 0.25 % by weight based on the anhydride, which comprises adding active silicic acid in two portions during the course of the phosphoric acid process, wherein at least half the total amount of silicic acid added is added during the decomposition of the crude phosphate and the remainder is added after the end of the decomposition but before the waste gypsum is filtered off, and the waste gypsum, after it has been filtered, is made into a suspension with water, separated from the liquid phase and dried.

Abstract: Derivatives of triiodo-aminobenzene carboxylic acids having the general formula: ##STR1## a process for their preparation and X-ray contrast agents containing them.

Abstract: A device for the recovery of noble metals emanating from the surface of catalysts used in high pressure gas reactions involving absorbing the noble metal dispersed in the reaction gas in an intercepting bed formed of acid-soluble metal oxides in which the external boundary surface of the intercepting bed is 1.5 to 20 times the cross-sectional area of the catalyst surface. The thickness of the intercepting bed, in the direction of gas flow through the material thereof, is 20 to 40 mm., and the flow of the reaction gases in the intercepting bed is in a direction parallel to the plane of the supporting base of the bed.

Abstract: Melon is prepared by heating, in the solid form, preferably as granules, a mixture of dicyandiamide and melamine, or a mixture of one or both thereof with urea and/or biuret and/or triuret and/or guanidine carbonate at a temperature from 450.degree. to 600.degree. C.

Abstract: Aluminium fluoride hydrates, especially aluminium fluoride trihydrate, are dehydrated by a process involving dehydration in two sections, the first dehydration being effected in a disc dryer while observing certain process conditions and the second dehydration being effected in a fluidized bed at a temperature up to 600.degree. C.

Abstract: A process for the preparation of 2-(substituted aryl)amino-2-imidazoline derivatives by reacting appropriate substituted aniline derivatives with 1-aroyl-imidazoline-2-ones in the presence of at least two mols of phosphorus oxychloride per mol of the aniline derivative and optionally hydrolyzing the resulting intermediate compound. Certain novel 2-dihaloarylamino-2-imidazoline derivatives with hypotensive action are also disclosed.

Abstract: Guanidine carbonate is isolated from dilute aqueous solutions containing guanidine, urea, pyrolysis products of urea, ammonia and carbon dioxide, by evaporation of the solution at a temperature of 80.degree. to 130.degree. C until a guanidine carbonate content of 20g/l and a pyrolysis products content of not more than 28g/l at 80.degree. C or not more than 128.degree. g/l at 30.degree. C is achieved, without exceeding a heating time of 6 hours at the upper temperature limit, separation of the precipitated pyrolysis products, subsequent cooling to not more than 45.degree. C, addition of ammonia to an ammonia content of 15 to 30 % by weight and separation of the precipitated guanidine carbonate.

Abstract: Phenoxypropylamine derivatives of the general formula: ##EQU1## in which R is a hydrogen atom or a straight-chain or branched alkyl group containing up to 10 carbon atoms, R.sub.1 is a hydrogen atom, a straight-chain or branched alkyl group containing up to 10 carbon atoms or a cyclopentyl, cyclohexyl, benzyl or phenyl group or R and R.sub.1 taken together form a pentamethylene-(1,5), tetramethylene-(1,4), 2-azapentamethylene-(1,5), 3-azapentamethylene-(1,5) or 3-oxapentamethylene-(1,5)-group, R.sub.2 is a hydrogen atom or an alkyl group containing up to 6 carbon atoms or a benzyl or phenyl group, R.sub.3 is a branched alkyl group containing 3 to 6 carbon atoms, a cyanoalkyl group containing up to 6 carbon atoms or a cycloalkyl group containing 3 to 7 carbon atoms and R.sub.4 is a hydrogen atom, an alkyl group containing up to 6 carbon atoms or a benzyl group, and the pharmaceutically-acceptable salts thereof having a cardioselective .beta.-blocking action.