Abstract: The present invention relates to the use of oxidic nanoparticles having an average particle size of 2 to 2000 nm in combination with at least one polycationic polymer as corrosion protection for metallic surfaces and also to a method of protecting metallic surfaces from corrosion, comprising the steps of: i) providing a formulation comprising oxidic nanoparticles (a) and at least one polycationic polymer (b) and an application medium, ii) applying the formulation to the metallic surface that is to be protected, and iii) optionally drying and/or heat-treating the surface.

Abstract: The invention relates to a condensation product obtainable by reaction of a1) at least one bicyclic or polycyclic aromatic or heteroaromatic, where the bicyclic or polycyclic aromatic or heteroaromatic is substituted by at least one carboxyl group (—COOH), and where the carboxyl group can be present in salt form, a2) at least one carbonyl compound, a3) if appropriate at least one sulfonating agent, a4) at least one urea derivative, and a5) if appropriate at least one further aromatic or heteroaromatic, or a physiologically tolerable salt thereof.

Abstract: The invention relates to a mixture comprising a surfactant and a cosurfactant, the cosurfactant being an amphiphilic polymer having one or more hydrophobic subunits (A) and one or more hydrophilic subunits (B), wherein one or more hydrophobic subunits (A) have been formed on the basis of a polyisobutene block whose polyisobutene macromolecules have terminal double bonds to an extent of at least 50 mol %.

Abstract: A process for the production of leather using one or more reaction products of (a) triamines or higher amines with (b) at least one compound of the general formula I A1-R1??I where R1 is selected from hydrocarbon radicals having 10 to 5000 carbon atoms, straight-chain or branched, saturated or having from one to three C—C double bonds, and A1 from groups capable of reacting with amines.

Abstract: Process for the preparation of aqueous formulations, wherein (A) at least one ethylenically unsaturated carboxylic acid, (B) at least one heterocyclic comonomer having at least one permanent cationic charge per molecule and (C-P1) at least one ethylenically unsaturated dicarboxylic acid or its anhydride are subjected to free radical copolymerization with one another in an aqueous medium and, shortly before the end or after the end of the copolymerization, further ethylenically unsaturated dicarboxylic acid (C-P2) or its anhydride is added.

Abstract: A formulation for use in chrome-free or chrome tanning is proposed, comprising a clay mineral which, after vigorous stirring for 30 minutes in water at 50° C., has a number average particle diameter of less than 2 ?m or a bimodal size distribution with a first, finely divided fraction whose number average particle diameter is less than 0.5 ?m and a second, coarser fraction whose number average particle diameter is less than 5 ?m, determined in each case by the method according to ISO 13320-1, by combined laser light diffraction and light scattering, the amount of the first, finely divided fraction being from 10 to 90% by weight, and one or more substances from one or more of the following groups: organic polymers, aldehyde tanning agents, sulfone tanning agents, resin tanning agents, phenol tanning agents, fatliquoring agents, vegetable tanning agents, dyes and pigments.

Abstract: Process for the preparation of aqueous formulations, aqueous formulations and their use A process for the preparation of aqueous formulations, wherein (A) at least one ethylenically unsaturated mono- or dicarboxylic acid or the anhydride thereof, (B) at least one comonomer having at least one permanent cationic charge per molecule and (C-P1) at least one ethylenically unsaturated carboxamide, are subjected to free radical copolymerization with one another in an aqueous medium.

Abstract: A semifinished leather product is produced from an animal hide by pretanning with the use of a chromium-free tanning agent and of a clay mineral which, after stirring for 30 minutes in water at 50° C. at a circumferential rotor speed of from 5 to 25 m/s, has a number average particle diameter of less than 2 ?m or a bimodal particle size distribution with a first, finely divided fraction whose number average particle diameter is less than 0.5 ?m and a second, coarser fraction whose number average particle diameter is less than 5 ?m, determined in each case by the method according to ISO 13320-1, by combined laser light diffraction and light scattering, a proportion of the first, finely divided fraction being from 10 to 90% by weight, and drying of the pretanned animal hide to a water content of from 5 to 45%, based on the total weight of the semifinished leather product.

Abstract: A composition comprising polyethylenimine, poly(meth)acrylic acid or salts thereof and, if appropriate, auxiliaries and additives typical for coating materials or paints, and also solvents, is used for corrosion control for the coating of carbon steel/black steel.

Abstract: An epichlorohydrinamine polymer has a ratio of amine units to epichlorohydrin units of from 0.8:1.2 to 1.0:1.0, dimethylaminopropylamine and benzylamine preferably being used as amine and/or ammonium units. The novel epichlorohydrinamine polymer is used, for example, for the surface treatment of semifinished leather products and textile materials.

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: A process for the preparation of polyisobutene containing at least 75 mol % of terminal vinylidene groups, in which isobutene or an isobutene-containing hydrocarbon mixture is polymerized in the liquid phase in the presence of a boron trifluoride complex catalyst having the composition a(BF3):b(Co1):c(Co2) where Co1 is at least one tertiary alcohol, Co2 is at least one compound selected from water, primary alcohols, secondary alcohols, dialkyl ethers, alkanecarboxylic acids and phenols, the ratio c:b is from 0.9 to 1.8 and the ratio (b+c):a is from 0.9 to 3.0, is described.

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: Horny substances are removed from hides, pelts or skins of dead animals by treating the hides, pelts or skins in aqueous liquor with one or more compounds of the formula I or their corresponding alkali metal or alkaline earth metal salts or ammonium or phosphonium salts, the variables being defined as follows: R1 is selected from hydrogen and C1-C12-alkyl, unsubstituted or substituted by one or more S—H or O—H groups; X1 to X4 are identical or different and are selected from hydrogen, C1-C4-alkyl, O—H, S—H and N—HR2, R2 is hydrogen or C1-C12-alkyl or a C1-C4-Alkyl-C?O group, at least one radical X1 to X4 being S—H when R1 contains at least one sulfur atom and at least two radicals X1 to X4 being S—H when R1 contains no sulfur atom.

Abstract: Tanning agents can be prepared by reacting at least one aldehyde of formula I, with at least one further identical or different aldehyde of formula I, where Z is a single chemical bond, unsubstituted or substituted C1-C12-alkylene, unsubstituted or substituted C5-C12-cycloalkylene or unsubstituted or substituted C6-C14-arylene, the reaction being carried out in the presence of an acidic catalyst and in the presence of at least one further carbonyl compound of formula II where R1 to R4, independently of one another, are hydrogen, unsubstituted or substituted C1-C12-alkyl, unsubstituted or substituted C3-C12-cycloalkyl, unsubstituted or substituted C7-C13-aralkyl or unsubstituted or substituted C6-C14-aryl, with the proviso that, where Z is a single chemical bond or a radical without a-hydrogen atoms, at least one further aldehyde of the formula I, in which Z contains ?-hydrogen atoms, or at least one further carbonyl compound of formula II is present.

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: Aqueous dispersions of copolymers are obtainable by free radical copolymerization of (A) at least one ethylenically unsaturated dicarboxylic anhydride, derived from at least one dicarboxylic acid of 4 to 8 carbon atoms, (B) at least one oligomer of branched or straight-chain C3-C10-alkene, at least one oligomer having an average molecular weight Mn of from 300 to 5 000 g/mol or being obtainable by oligomerization of at least 3 equivalents of C3-C10-alkene, (C) optionally at least one ethylenically unsaturated comonomer differing from (A), and optionally reaction with (D) at least one compound of the formula I a or I b and subsequent addition of water, where, in formulae I a and I b, A1 are identical or different C2-C20-alkylene, R1 is linear or branched C1-C30-alkyl, phenyl or hydrogen, and n is an integer from 1 to 200, the water content being from 30 to 99.5% by weight, based on aqueous dispersion.

Abstract: Leathers are produced by a process wherein pelts, pickled pelts or semifinished products are treated with at least one polymer which is obtainable by copolymerizing (A) at least one ethylenically unsaturated mono- or dicarboxylic acid of 3 to 8 carbon atoms or at least one anhydride derived from a mono- or dicarboxylic acid of 3 to 8 carbon atoms, (B) at least one vinylaromatic compound, (C) at least one alkoxylated unsaturated ether of the formula I (D) optionally further monoethylenically unsaturated monomers, where, in formula 1, the variables are defined as follows: R1, R2 and R3 are identical or different and are selected from C1-C4-alkyl and hydrogen; R4 and R5 are in each case identical or different and are selected from C1-C4-alkyl and hydrogen; R6 is selected from hydrogen, SO3M, PO3M2, C1-C30-alkyl, CO—H (formyl), CO—C1-C20-alkyl and CO—C6-C14-aryl, M is an alkali metal or NH4+ or CH3, n is an integer from 3 to 100 and y is an integer from 0 to 10.