<p>A mixture (I) contains (A) a condensation resin prepared from (A1) urea or urea derivatives and (A2) ketones or aldehydes consisting of C-H acidic aldehydes and/or ketones or mixed with formaldehyde and (B) a radiation curable compound containing 2-acryloyl- or methacryloyl groups. An Independent claim is included for a printing ink containing (I) as a binding agent.</p>