Abstract: N-acylamino carboxylic acids and N-acylamino sulfonic acids and their alkali metal salts from the technical alkali metal salts of amino carboxylic acids and amino sulfonic acids, respectively, with an active content of 50-95% by weight, based on the solids content of the technical alkali metal salts, and from alkyl carboxylates, are prepared by(a) preparing a suspension of the solid anhydrous technical alkali metal salts of the amino carboxylic acids or amino sulfonic acids in the alkyl carboxylates,(b) reacting this suspension by adding more than 30 to 150 mol % of strong bases to give the alkali metal salts of the N-acylamino carboxylic acids or N-acylamino sulfonic acids, and(c) if required preparing therefrom the free N-acylamino carboxylic acids or N-acylamino sulfonic acids in a conventional way by adding acids.

Abstract: A process for compounding polymer dispersions, which comprises circulating the polymer dispersion from a vessel (7) having a stirring device (6) through a line (3) having a mixing device (2) by means of a pump (4) which is located in the line (3), and, before the entry of the circulated polymer dispersion into the mixing device (2), metering at least one solution or dispersion of at least one compounding material from at least one stock container (5) via a supply line (9) into the circulated polymer dispersion.

Abstract: A coating composition is described comprising, in an aqueous medium:A) a resin having a plurality of primary amine groups, andB) a curing agent having a plurality of cyclic carbonate groups.

Abstract: A spray gun cleaning device for capturing and condensing cleaning solvent and a method for using. The spray gun cleaning device comprises:(a) a passage way comprising an inlet and an outlet, wherein said inlet defines a receptacle for receiving a spray gun nozzle,(b) a vertically descending member having a proximal opening and first and second distal openings, wherein the first distal opening is located downstream from the proximal opening and at a 90.degree. angle to the second distal opening, and wherein the descending member is connected to the passage way at its proximal opening,(c) a waste collection container located downstream of the vertically descending member, and connected to the first distal opening of the descending member, and(d) a vertically ascending passive condenser attached to the vertically descending member at its second distal opening, wherein the condenser comprises a multiplicity of tubular members located adjacent to one another.

Abstract: Provided are aqueous paints with which paint films which have excellent paint film properties such as water resistance and resistance to chemical attack, and excellent finished appearance are obtained, and which have excellent painting operability and storage stability. The invention further provides water dispersible acrylic based graft copolymers, aqueous paints incorporating same and a method to make such paints, wherein an unsaturated bond-containing acrylic based copolymer (a) obtained by reacting an acrylic based copolymer (a1) of acid value 35-120 mg.KOH/gram, hydroxy group value 50-150 mg.KOH/gram, glass transition temperature -20.degree.-+50.degree. C. and number average molecular weight 4500-9000 and an unsaturated monomer mixture (a2), which has functional groups which can react with hydroxy groups, in a mol ratio of a2/a1=0.4-1.

Abstract: A process for preparing 2,2,6,6-tetramethylpiperidin-4-one (TAA) is described, whereina mixture comprising acetone and/or acetone condensates and ammonia in a molar ratio of from 20:1 to 3:1at from 50.degree. to 130.degree. C.is reacted in the presence of dimethyl sulfate, the amount of dimethyl sulfate being from 0.5 to 5 mol-%, based on acetone.

Abstract: Silanes of the general formula I ##STR1## wherein n is an integer of from 1 to 5, at least one of the residues R represents a hydrolyzable residue selected from the group of substituents consisting of halogen, alkoxy, sec. amino and oxycarbonyl hydrogen or oxycarbonyl alkyl, and the other residues represent alkyl, cycloalkyl, aryl or one of the said hydrolyzable residues, a process for their preparation, and their use.

Abstract: A process is provided for the isolation of (meth)acrylic acid from a mixture containing (meth)acrylic acid as the main component and lower aldehydes as secondary components by rectification in a rectification column having a stripping section and a rectification section, wherein the starting mixture containing the (meth)acrylic acid to be isolated by rectification is not fed directly to the rectification column but is first passed into a heated dwell vessel which is connected to the vapor side of the rectification section of the rectification column and in which the starting mixture is kept at the boil and, instead of the starting mixture as such, the bottom liquid of the dwell vessel is fed to the rectification column.

Abstract: A process and intermediates for preparing .alpha.

Abstract: The present invention relates to a process for the production of a powder coating, in which a suspension of powder particles is sprayed and the spray jet is directed onto the substrate to be coated, characterized in that1.) a suspension of powder particles in a liquefied gas is employed, the gas having been liquefied under a pressure of not more than 20 bar, and2.) the liquid gas is vaporized before, during or after the spraying of the suspension.

Abstract: A silica-supported catalyst suitable for the selective hydrogenation of acetylene in hydrocarbonaceous streams, comprising from 0.001 to 1% by weight, based on the supported catalyst, of palladium and from 0.005 to 5% by weight, based on the supported catalyst, of at least one promoter metal of groups 1 and 2 of the periodic table, obtainable by impregnating a silica support with a solution comprising at least one promoter metal, drying the impregnated support, impregnating with a palladium-including solution, drying and calcining.

Abstract: A process for the dehydrogenation of ethylbenzene to styrene with input of heat by a heat-transfer medium on a dehydrogenation catalyst which is essentially located in a tube bundle, wherein the heat-transfer medium flows countercurrently to the reaction mixture in the region of the tube bundle, and, if required, another reaction chamber is located downstream of the tube bundle and is provided with a catalyst for adiabatic reaction.

Abstract: Dye mixtures comprising one or more pyridone dyes of the formula ##STR1## where M is a pyridone or triazolopyridone radical which is bonded to the thiazole ring via CH and the other radicals are each as defined in the description, and one or more dyes based on 1-aminoanthraquinone are useful for thermal transfer.

Abstract: A process for preparing phosphorus-doped silver catalysts from silver contaminated with phosphorus compounds, which comprisesa) heating the silver which is contaminated with phosphorus compounds to temperatures at which the silver is liquid and subsequently cooling to temperatures below the melting point,b) preparing silver crystals from the silver obtained in stage a) by anodically oxidizing it to silver ions in an electrolysis cell with an aqueous electrolyte, and cathodically reducing the silver ions again to elemental silver, andc) contacting the silver crystals with a finely divided phosphorus compound with a melting point or decomposition temperature above 500.degree. C. (phosphorus compound P).

Abstract: A coating composition is disclosed that includes:(A) a multi-functional compound having(1) at least one carbamate or urea functional group,(2) at least one other functional group which may or may not be carbamate or urea, and(3) at least one hydrogen bond acceptor group that is not also a hydrogen bond donor group, with the proviso that said multi-functional compound is other than an acrylic polymer or oligomer having carbamate functional or urea groups appended to the acrylic backbone through acrylic ester side chains, a polyester polymer or oligomer that is the polycondensation reaction product of a polyol and a polyacid component, or a polyurethane that is the reaction product of a polyisocyanate component and a polyester polyol component, and(B) a curing agent comprising a plurality of groups that are reactive with the functional groups on compound (A).

Abstract: Foam materials based on copolymers of styrene with from 2 to 50 mol % of 1,1-diphenylethene have a high heat distortion resistance.

Abstract: Thermoplastic molding compounds comprise as essential componentsA) from 10 to 100% by weight of copolymers of the monomers of the general formulae I and II ##STR1## where R.sub.1 is H or alkyl of 1-22 carbon atoms,R.sub.2 is H or alkyl of 1-22 carbon atoms,R.sub.3 is H or alkyl of 1-4 carbon atoms,a is 0, 1, 2, 3, 4 or 5, andb is 0, 1, 2, 3, 4 or 5,B) from 0 to 3000 ppm, based on the weight of component A, of compounds of the general formula I,C) from 0 to 500 ppm, based on the weight of component A, of compounds of the general formula II,D) from 0 to 90% by weight, based on the total weight of the molding compound, of polymers other than A), andE) from 0 to 50% by weight, based on the total weight of the molding compound, of additives and processing aids.

Abstract: Paper coating slips contain an emulsion copolymer, comprising overallfrom 0 to 60% by weight of a vinylaromatic,from 40 to 95% by weight of a C.sub.1 -C.sub.10 -alkyl (meth)acrylate,from 5 to 40% by weight of an alkenylnitrile,from 0 to 10% by weight of an ethylenically unsaturated acid andfrom 0 to 20% by weight of further monomersas a binder, wherein the emulsion copolymer is a mixture of at least two polymers or an emulsion copolymer comprising at least two stages, one polymer or one stage whose content in the emulsion copolymer is from 10 to 75% by weight containing at least 90% by weight of the total amount of alkenylnitrile (alkenylnitrile-rich polymer or stage).

Abstract: The present invention provides wire-coating compositions comprising polyhydric alcohols which are esterified with naphthalenedicarboxylic acid and/or esterifiable derivatives thereof, optionally in a mixture with further dicarboxylic acids and/or their dicarboxylic acid derivatives, catalysts, organic solvents and additives, and optionally imido-containing and/or imido-forming starting materials. The wire-coating compositions of the invention are stable on storage, have good adhesion, especially to copper wires and have desireable thermal pressure and thermal shock. The compositions also have a high solids content at a viscosity which is favorable for processing.

Abstract: A process for the continuous preparation of thermoplastic polyesters bya) a first step of (trans)esterifying a dicarboxylic acid or its esters or ester-forming derivatives with a molar excess of a dihydroxy compound,b) a second step of precondensing the (trans)esterification product of a), andc) a third step of polycondensing the product of b)comprises carrying out step a) and/or step b) of the process in two or more temperature zones.