Abstract: The invention relates to a process for separating mineral finest grain from coal slurries or washings obtained in coal processing, by treating the washing with a selective anionic dispersing agent for the finest grain, having a molecular weight of .ltoreq.10000 g/mol, and subsequent selective flocculation of the coal by means of a flocculating agent known per se.

Abstract: The present invention relates to a process for the production of N-substituted acrylic acid amides by conversion of 2-carboalkoxy-t-oxabicyclo(2,2,1)hept-5-enes with primary or secondary amines to 2-carboxamide-7-oxabicyclo(2,2,1)hept-5-enes and the thermal decomposition of the latter, preferably in the presence of Lewis acids and in a vacuum, to furane and N-substituted acrylic acid amides. The process according to the invention results in high purity N-substituted acrylic acid amides that are, in the main, free of bifunctional monomers which would disrupt the subsequent polymerization of the N-substituted acrylic acid amides by undesired cross-linking.

Abstract: An absorption material is produced by applying directly to a support in the presence of liquid an absorbent which is at least partially water-softened, and drying to remove the liquid so as to leave the absorbent directly on the support. The support may be fibrous or particulate like sawdust or it may be a textile sheet or paper. The absorbent may be an acrylic based polymer. Because the absorbent directly contacts the support the product has increased absorptive capacity and is stronger, making it especially useful as a diaper, tampon, sanitary napkin, surgical dressing, battery separator and/or filter for cigarette smoke or for liquids.

Abstract: This invention describes a process for the production of N-(tert-aminoalkyl)acrylamides by the reaction of acrylic acid with a suitable tertiary aminoalkylamine at a temperature of 150.degree.-230.degree. C. The aminoalkylamine and acrylic acid are reacted in equimolar quantities, preferably in the presence of an acidic or a basic catalyst.

Abstract: The invention relates to a process for the production of 7-oxabicyclo-(2,2,1)hept-5-ene derivatives by conversion of acrylic acid esters and furanes in the presence of catalytic quantities of a Lewis acid. By use of Lewis acid, the reaction time is greatly reduced with good results in terms of product purity by comparison with known processes. The reaction products are intermediates, e.g. in the production of N-substituted acrylic acid amides.

Abstract: A process is disclosed for the rapid dissolution of a water soluble polymer by mixing the polymer with water and using a hydrophilic wetting agent, wherein the water is introduced under normal mixing conditions into a prepared water-in-oil polymer dispersion that is free of wetting agent, the wetting agent being added after dilution of the prepared water-in-oil dispersion with water. It is preferred that the water be added under pressure through a nozzle.

Abstract: The invention concerns mixtures of alkali salts of sulfosuccinic acid dialkylesters and higher aliphatic alcohols, and the use of these mixtures as defoaming agents for mineral acid decomposition media, in particular media decomposing phosphates.

Abstract: This invention relates to gels consisting of the reaction product of water-soluble polymers of poly(meth)acrylic acid derivatives and multivalent metal salts, in which connection such gels are characterized by the fact that they consist either of the reaction product of a W/O dispersion of the water-soluble polymers with water-soluble solutions of the metal salts, or of the reaction product of aqueous polymer solutions with W/O emulsions of the metal salts. Further, the invention relates to a process for the production of the gels, as well as their use to seal or consolidate permeable soluble materials and to form mortar type combining masses.