Abstract: Flexible, sheet-like substrates having an abrasive surface, which are obtainable by applying an aqueous solution or dispersion of at least one precondensate of a heat-curable resin to the top and/or bottom of a flexible, sheet-like substrate in an amount of at least 5 to 90% by weight, based on the uncoated, dry substrate, crosslinking the precondensate and drying the treated substrate.

Abstract: The invention relates to a condensation product obtainable by reaction of a1) at least one aromatic or heteroaromatic, where the aromatic or heteroaromatic is substituted by at least one hydroxyl group (—OH) and at least one carboxyl group (—COOH), and where the hydroxyl and/or carboxyl group can be present in salt form, a2) at least one carbonyl compound, a3) optionally at least one sulfonating agent a4) optionally at least one urea derivative, and a5) optionally at least one further aromatic or heteroaromatic, or a physiologically tolerable salt thereof, with the precondition that the component a1) is not salicylic acid or sulfosalicylic acid if the component a4) is melamine.

Abstract: The present invention relates to the use of a tanning agent in or on filters, in particular natural or synthetic fibrous fabric or foams, for the avoidance of infections, these filters in particular being part of respiratory protection masks or respiratory protection apparatuses.

Abstract: The invention relates to a mixture comprising i) at least one condensation product (A) obtainable by reaction of a1) at least one aromatic system or heteroaromatic system, a2) at least one carbonyl compound, a3) if appropriate at least one sulfonating agent and a4) if appropriate at least one urea derivative, where the condensation product (A) has an Mw value ?9000 g/mol, and ii) at least one tanning agent having an Mw value ?3000 g/mol.

Abstract: In a process for preparing alkoxycarbonylaminotriazines, di- or triaminotriazines are reacted with cyclic carbonic esters and optionally with minor amounts of acyclic carbonic esters in the presence of an alcohol and of an alkali metal alkoxide or alkaline earth metal alkoxide as a base.

Abstract: Adducts are obtained by reacting carbonyl compounds of the formula I where R1 and R2 are as defined, with cyclic compounds of the formula II where X is selected from oxygen, sulfur and N—R8, R3-R8 are as defined, and n is an integer from 1 to 4, which adducts are useful as tanning agents and preservatives.

Abstract: A process is described for preparing alkoxycarbonylaminotriazines by reacting di- or triaminotriazines with dimethyl carbonate in the presence of an alcohol and of an alkali metal or alkaline earth metal methoxide base.

Abstract: The present invention relates to the use for coating three-dimensionally structured surfaces and/or moldings of melamine resin sheets and/or films produced from cellulosic fiber materials post- or pre- and post-impregnated with an aqueous solution comprising (i) a melamine-formaldehyde condensate, (ii) an etherified melamine-formaldehyde condensate, and (iii) a polymer dispersion.

Abstract: A process for the preparation of aqueous formulations, and aqueous formulations so prepared, the process comprising heating at least one cyclic compound of the formula I in the presence of water and of an acidic catalyst and, during or after the heating, H—X—R3 is at least partially separated off, where, in formula I, X is selected from oxygen, sulfur and N—R6, R1-R6 are as defined, and n is an integer from 1 to 4.

Abstract: A process is described for preparing alkoxycarbonylaminotriazines by reacting di- or triaminotriazines with dimethyl carbonate in the presence of an alcohol and of an alkali metal or alkaline earth metal methoxide base.

Abstract: In a process for the continuous preparation of 2-bromo-2-nitro-1,3-propanediol, nitromethane is firstly reacted with formaldehyde and alkali metal hydroxide and the reaction mixture obtained in this way is subsequently reacted with bromine.

Abstract: The present invention provides a process for preparing a terpyridine compound of the formula I by obtaining a C1-C4-alkyl pyridine-2-carboxylate derivative by acid hydrolysis of a 2-cyanopyridine derivative by means of an anhydrous inorganic acid or its anhydride in the presence of water and a C1-C4-alkanol, with an equimolar amount of water being added to the 2-cyanopyridine derivative prior to addition of the anhydrous inorganic acid or its anhydride, subsequently condensing the resultant C1-C4-alkyl pyridine-2-carboxylate derivative with acetone in an aprotic solvent in the presence of a base, then reacting the obtained 1,5-bis(2-pyridyl)pentane-1,3,5-trione derivative with ammonia or ammonium salts (NH4)qY with removal of the water of reaction formed by employing a C1-C4-alkanol as an entrainer, and finally chlorinating the resultant 2,6-bis(2-pyridyl)-4(1H)pyridinone derivative in the presence of phosphorus oxide chloride.

Abstract: A process for the preparation of creatine or creatine monohydrate by reaction of sodium or potassium sarcosinate with cyanamide at a temperature from 20 to 150° C. and a pH from 7.0 to 14.0 comprises carrying out the pH adjustment with carbonic acid.

Abstract: A process for producing solid creatine-containing dosage forms, wherein a) a mixture which comprises at least one thermoplastic, physiologically tolerated, water-soluble or water-swellable polymeric binder and creatine, and contains 1 to 20 mol of water per mol of creatine is prepared, b) the mixture is plasticated at or above the softening point of the polymeric binder, preferably with at least partial evaporation of the water, c) the plasticated mixture is shaped to dosage forms and cooled.

Abstract: A process for producing fiberboard panels includes I. gluing cellulosic fibers with an aqueous glue solution and adjusting the moisture content of the cellulosic fibers and/or the water content of the glue such that the moisture content of the glued cellulosic fibers is not more than 150%; and II. compressing the glued cellulosic fibers produced in step (I) at elevated temperature to fiberboard panels.

Abstract: Process for preparing terpyridines of the formula I 1

Abstract: Aqueous melamine resin dispersions comprise as discontinuous phase a melamine resin stabilized with a combination of a cationic protective colloid and an anionic protective colloid.

Abstract: A process for preparing guanidine derivatives, in particular creatine, is described and entails continuously combining a cyanamide derivative and a primary or secondary amine in the presence of crystals of the guanidine derivative.

Abstract: A process for purifying creatine is described in which the creatine to be purified in the form free of water of crystallization is introduced into a saturated aqueous solution of creatine monohydrate, in which the creatine free of water of crystallization is dissolved with hydration, crystals of creatine monohydrate precipitate from the aqueous solution and these are separated off from the aqueous solution.

Abstract: A process for the preparation of an O-alkylisourea of the formula I, where R1 is C1- to C20-alkyl, in the form of an acid addition salt, in which urea and an alkyl-transferring reagent, if required dissolved or suspended in a diluent, are reacted at 40-200° C. in a continuously operated reactor, is described. The diluent is preferably a recycled part-stream of the O-alkylisourea acid addition salt obtained.