Abstract: Aqueous dispersions comprising a polyurethane composed of a) diisocyanates, b) diols of which b1) from 10 to 100 mol %, based on the total amount of diols (b), have a molecular weight of from 500 to 5000, and b2) from 0 to 90 mol %, based on the total amount of diols (b), have a molecular weight of from 60 to 500 g/mol, c) monomers other than the monomers (a) and (b), containing at least one isocyanate group or at least one isocyanate-reactive group and further carrying at least one hydrophilic group or potentially hydrophilic group by means of which the polyurethane is made dispersible in water, d) if desired, further, polyfunctional compounds other than the monomers (a) to (c), containing reactive groups which are alcoholic hydroxyl groups, primary or secondary amino groups or isocyanate groups, and e) if desired, monofunctional compounds which are other than the monomers (a) to (d) and contain a reactive group which is an alcoholic hydroxyl group, a primary or secondary amino group or an isocyanate group

Abstract: Mixtures comprising (A) an isocyanurate and/or biuret of 1,6-diisocyanatohexane (HDI), (B) an isocyanurate of 1-isocyanato-3,5,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI), (C) at least one emulsifier, and (D) if desired, solvent.

Abstract: The invention relates to mixtures containing (A) an isocyanurate and/or biuret of 1,6-diisocyanatohexane (IIDI), (B) an isocyanurate of 1-isocyanato-3,5,5-trimethyl-5-isocyanaLomethyl-cyclohexane (IPDI), (C) at least one emulsifier, which can be obtained by reacting a diisocyanate (C2) selected from tetramethylenediisocyanate, dodecamethylenediisocyanate, 1,4-diiso-cyanatocyclohexane, 4,4?-di(isocyanatocyclohexyl)methane, trimethylhexandiisocyanate, tetramethylhexandiisocyanate, 2,4 or 2,6 toluylenediisocyanate and the isomer mixtures thereof, tetratnethylxylylenediisocyanate, p-xylylenediisocyanate, 2,4? or 4,4? diiso-cyanatodiphenylmethane and a mixture of at least two of said diisocyanates having at least one component (C1) which contains at least one group which can react with isocyanate groups and at least one hydrophile group, and (D) optionally a solvent.

Abstract: Aqueous polyurethane formulations, their use and substrates which are coated with such formulations are described.

Abstract: An automated method for surface monitoring and surface correction of sheet-like materials, for example of leather, especially a method for classifying surfaces of sheet-like materials, comprises the following steps: (a) preparation of a material, (b) optoelectronic recording of the surface of the material, (c) determination of the number of defects, (d) determination of the volume of defects, and subsequent automatic classification of the sheet-like materials according to number and volume of defects.

Abstract: Aqueous dispersions comprising a polyurethane composed of (a) diisocyanates, (b) diols, (c) monomers, excluding monomers (a) and (b), containing at least one isocyanate or isocyanate-reactive group and further carrying at least one hydrophilic group to render the polyurethane dispersible in water, d) optionally, polyfunctional compounds, excluding monomers (a) to (c), containing alcoholic hydroxyl, primary or secondary amino, or isocyanate reactive groups, and (e) optionally, monofunctional compounds, excluding monomers (a) to (d), containing an alcoholic hydroxyl, primary or secondary amino, or isocyanate reactive group, obtained by reacting the monomers (a), (b), (c), and, optionally (d) and (e), in the presence of a cesium salt.