| abstract |
A curing agent (A) containing active CH groups is characterised in that it contains at least two groups of the formula (I) <IMAGE> or structural units of the formula (I') or (I") <IMAGE> in which A is <IMAGE> X and Y are identical or different and are <IMAGE> CO2R<1>, CN, NO2, CONH2, CONR<1>H or CONR<1>R<1>, where the radicals R<1> may be identical or different and are hydrocarbon radicals, preferably alkyl radicals having 1 to 12 carbon atoms, which may also be interrupted by oxygen or an N-alkyl radical, with the proviso that only one of the two radicals X and Y may be an NO2 group; A' is <IMAGE> X' and Y' are identical or different and are <IMAGE> Curable mixtures of (A) and a Michael acceptor (B) and optionally diluents and conventional additives cure rapidly even at low temperatures and are particularly suitable for surface-coating compositions. |