JPH0528241B

1. High concentrated, aqueous dispersions optionally containing inert solvents and/or reactive unsaturated thinners, of UV-radiation-crosslinkable oligourethanes for the preparation of high gloss lacquer coatings on leather, which dispersions contain a reaction product of a) 30-85.8 % by weight of one or more macrodiols having a molecular weight of 400-6000, from the group consisting of polyether-diols, polyester-diols, polylactone-diols and polycarbonate-diols or their mixtures, with the macrodiols or their mixtures having a melting point below 30 degrees C, b) 1-12 % by weight of anionic or nonionic compounds which are monofunctional or difunctional towards isocyanate groups, with the anionic compounds containing carboxylate or sulphonate groups as dispersant centres and OH- or NHR1 - groups (R1 =H, alkyl or aryl) as isocyanate reactive groups and the nonionic compounds containing longer-chain polyoxyethylene segments as dispersant groups, c) 12-65 % by weight of (cyclo-aliphatic, araliphatic and/or aromatic diisocyanates, d) 0.2-10 % by weight of low molecular, predominantly difunctional chain lengtheners with molecular weights of less than 400, which carry hydroxyl groups and/or free or blocked amino groups and e) 1-15 % by weight of compounds of the general formula see diagramm : EP0181486,P11,F1 wherein R denotes a difunctional, optionally branched hydrocarbon radical with 2-10 carbon atoms and R' denotes hydrogen or a carbon radical with 1-4 carbon atoms, the oligourethanes having a double bond number of 2.5 to 15 g of bromine/100 g of oligourethane solids and a molecular weight of 3000 to 18,000.