| abstract |
A curable aqueous polyurethane dispersion substantially comprises n a) at least one compound having two free isocyanate groups, at least one allophanate group and at least one C═C double bond capable of free radical polymerization, a carbonyl group or an oxygen atom in the form of an ether function being bonded directly to the double bond, n b) at least one compound having at least one group reactive toward isocyanate groups and having a C═C double bond capable of free-radical polymerization, n c) if required, at least one compound having at least two groups reactive towards isocyanate groups and selected from hydroxyl, mercapto, primary and/or secondary amino groups, n d) at least one compound having at least one group reactive towards isocyanate groups and having at least one acid group, n e) at least one basic compound for neutralizing or partially neutralizing the acid groups of the compounds d), n and a thermal initiator and is used for coating substrates. |