Patent ID: 7868055

Claim:
Aqueous UV-hardenable dispersions comprising the reaction product of a) one or more polyisocyanates with an average functionality of at least 2.2, of which at least one polyisocyanate is an oligomeric polyisocyanate of hexamethylene diisocyanate with urethane, biuret, iminooxadiazindione and/or isocyanurate structural units, wherein the polyisocyanate component comprises at least 40 wt. % of liquid oligomeric polyisocyanates based on hexamethylene diisocyanate with isocyanurate, biuret, uretdione, carbodiimide and/or iminooxadiazindione structural units, and at most 60 wt. % of isophorone diisocyanate, H6-2,4- and/or 2,6-toluylidene diisocyanate, 1,6-hexamethylene diisocyanate, 4,4′-diisocyanatodicyclohexylmethane and/or 2,4′-diisocyanatodicyclo-hexylmethane and/or 2,2′-diisocyanatodicyclohexylme-thane and/or 2,4- and/or 2,6-toluylidene diisocyanate and/or their reaction products with trimethylolpropane, butane- diol, ethylene glycol, diethylene glycol, propylene glycol or neopentyl glycol, b) one or more monohydroxy-functional compounds containing (meth)-acryloyl groups, c) at least one component c1), which has a hydrophilising effect on the basis of ionic or potentially ionic groups and comprises at least one further isocyanate-reactive group and at least one component c2) which contains non-ionically hydrophilically acting groups and comprises at least one further isocyanate-reactive group, wherein c1) comprises at least one compound selected from the group consisting of mono- and dihydroxycarboxylic acids, mono- and diaminocarboxylic acids, mono- and dihydroxysulfonic acids, mono- and diaminosulfonic acids, mono- and dihydroxyphosphonic acids, mono- and diaminophosphonic acids and their salts, an addition product of IPDI and acrylic acid and their alkali metal and/or ammonium salts, the adduct of sodium bisulfite to butane-2-diol-1,4, polyether sulfonate, the propoxylated adduct of 2-butenediol and NaHSO 3 , as well as structural units convertible into cationic groups, such as N-methyldiethanolamine, addition product of (i) diamines and (ii) acrylic acid and/or dimethylolpropionic acid and c2) comprises at least one compound selected from the group consisting of polyoxyalkylene ethers which contain from 30 wt. % up to 100 wt. % of structural units that are derived from ethylene oxide of the general formula (I) in which R 1 and R 2 independently of one another in each case denote a divalent aliphatic, cycloaliphatic or aromatic radical with 1 to 18 C atoms, which can be interrupted by oxygen and/or nitrogen atoms, and R 3 denotes an alkoxy-terminated polyethylene oxide radical, and monohydroxy-functional polyalkylene oxide polyethers which comprise at least 100 mol % of ethylene oxide units, and have a molecular weight of 350 to 2500 g/mol, d) one or more difunctional and/or polyfunctional amines or hydroxyamines as chain extender, and e) optionally other monomeric, oligomeric and/or polymeric substances, which may optionally also contain further unsaturated groups.