Abstract: The invention relates to specific chrome tanning agents and also to their use for the tanning of hides and skins, and to the leather and pelts obtainable as a result. It further provides a new process wherein the protein-masked chrome tanning agents of the invention are obtained from materials containing chromium and collagen, more particularly from leather production wastes such as leather shavings, for example. This enables recycling of chromium-containing leather production wastes, thereby permitting a significant reduction in the amount of such wastes, a fact which leads to considerable economic, environmental and logistical advantages.

Abstract: A method of preparing hydrophobicizing leather treatment compositions includes the steps of a) free-radically initiated copolymerization of i) at least one ethylenically unsaturated carboxylic acid or its derivatives, and ii) at least one (meth)acrylate of a primary saturated C8 to C22 alcohol, b) mixing the reaction mixture obtained after step a) with water, c) salting at least some of the carboxyl groups of the reaction mixture obtained after step b) with a base, and d) shearing the reaction mixture obtained after step c) to an average particle size of 0.05-10 ?m, wherein step a) is carried out in oil as reaction medium and wherein the atmosphere in step a) contains less than 0.1% by volume of an oxidizing gas.

Abstract: The invention relates to specific chrome tanning agents and also to their use for the tanning of hides and skins, and to the leather and pelts obtainable as a result. It further provides a new process wherein the protein-masked chrome tanning agents of the invention are obtained from materials containing chromium and collagen, more particularly from leather production wastes such as leather shavings, for example. This enables recycling of chromium-containing leather production wastes, thereby permitting a significant reduction in the amount of such wastes, a fact which leads to considerable economic, environmental and logistical advantages.

Abstract: Solid particulate material containing a) at least one compound containing carbamoylsulphonate groups and b) at least one organic tanning agent.

Abstract: A method of preparing hydrophobicizing leather treatment compositions includes the steps of a) free-radically initiated copolymerization of i) at least one ethylenically unsaturated carboxylic acid or its derivatives, and ii) at least one (meth)acrylate of a primary saturated C8 to C22 alcohol, b) mixing the reaction mixture obtained after step a) with water, c) salting at least some of the carboxyl groups of the reaction mixture obtained after step b) with a base, and d) shearing the reaction mixture obtained after step c) to an average particle size of 0.05-10 ?m, wherein step a) is carried out in oil as reaction medium and wherein the atmosphere in step a) contains less than 0.1% by volume of an oxidizing gas.

Abstract: Solid particulate material containing a) at least one compound containing carbamoylsulphonate groups and b) at least one organic tanning agent.

Abstract: The present invention relates to polyurethane dispersions comprising polysiloxane building blocks reactive towards isocyanates and processes for using their preparation and their use in coating leather.

Abstract: Process for hydrophobing a leather tanned with organic tanning agents, characterized in that the leather is treated with a preparation containing at least one alkylalkoxysilane of the formula I R1R2 Si(OR3)(OR4)??(I), in which R1 represents a C1-C30-hydrocarbon radical, in particular an aliphatic, preferably an aliphatic, saturated C6-C20-radical, particularly preferably hexadecyl or octadecyl, R3 and R4, independently of one another, represent a C1-C10-hydrocarbon radical, in particular an aliphatic C1-C10-radical, preferably saturated, particularly preferably a C1-C4-radical, methyl, ethyl, propyl or isopropyl being preferred, and R2, independently of R1, has the meaning of R1 or represents OR3 or OR4.

Abstract: Polyurethane which is obtainable by reacting a) an NCO-containing prepolymer composed of a1) at least one polyesterpolyol, preferably polycarbonatepolyol, carbonate group-free polyesterpolyol, polyestercarbonatepolyol, polyesteramidepolyol, in particular polyesterdiol, having an average molecular weight, determined as the number average, greater than or equal to 500 g/mol, preferably from 500 to 6000 g/mol, in particular from 500 to 4000 g/mol, very particularly preferably from 800 to 4000 g/mol, and a2) at least one polyetherpolyol which differs from a1) and is preferably polyalkylene glycol, such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyhexamethylene glycol and copolyethers, in particular those containing building blocks from the group consisting of ethyleneoxy, propyleneoxy, tetramethyleneoxy and/or hexamethyleneoxy, having a molecular weight, determined as the number average, greater than or equal to 500, preferably from 500 to 10 000 g/mol, in particular from 500 to 40

Abstract: (Co)polymers which contain a) structural units of the general formula I in which W represents a trivalent radical from the group in which * indicates the orientation for the incorporation of the radical W into the formula I, and Z represents the radicals —OH, —O?M+ or —N—R1R2, in which R1 and R2, independently of one another, represent hydrogen, optionally substituted alkyl radicals, alkenyl radicals, aralkyl radicals or cycloalkyl radicals, which may be interrupted by 0 atoms, N atoms, Si atoms or amido, carbonate, urethane, urea, allophanate, biuret or isocyanurate groups or mixtures thereof, and M+ represents H+ or an alkali metal ion, an NH4 ion or a primary, secondary, tertiary or quaternary aliphatic ammonium radical which preferably carries a C1-C22-alkyl or C1-C22-hydroxyalkyl group, b) at least 10 mol %, based on the units of the formula I, of structural units of the general formula Ia in which R3 represents a hydrocarbon radical having C1-C60-atoms, preferably a saturated C1-C60-alk

Abstract: Aqueous polyurethane dispersions containing a polyurethane, composed of a) at least one polyol having an average molecular weight, determined as the number average, of 500-6000 g/mol, preferably 1000 to 4000, in particular 1500 to 3000 g/mol, b) at least one polyol, preferably diol, having a molecular weight of less than 500 g/mol, preferably of 61 to 499 g/mol, c) at least one aliphatic polyisocyanate, preferably diisocyanate, d) at least one diol having a molecular weight of less than 450 g/mol, which carries one or more ionic groups and/or one or more potentially ionic groups, preferably at least one carboxyl group, e) at least one amine which is reactive towards NCO groups, carries hydroxyl groups and has an OH functionality of 1 to 6, f) water and optionally g) a monoalcohol, characterized in that the molar ratio of polyol of the component a) to the sum of the polyols b) and d) is 1:1.