Hardener for anhydride group-containing polymers

The curable composition, which consists of

• (a) a liquid oligomer or liquid polymer having a molecular weight of 200-50,000 and containing dicarboxylic anhydride groups selected from the group consisting of
• a copolymer consisting of an unsaturated dicarboxylic anhydride and of one or more than one olefinically unsaturated monomer,
• an addition product obtained by reacting an unsaturated dicarboxylic anhydride with a polymer containing individual or conjugated double bonds,
• an addition product obtained by reacting an unsaturated dicarboxylic anhydride with unsaturated degradation products of high molecular weight elastomers,
• a graft polymer obtained by radically reacting an unsaturated dicarboxylic anhydride with a liquid polymer containing unsaturated double bonds, and
• a polymeric ester anhydride obtained by esterifying polyols with trimellitic anhydride, pyromellitic anhydride, benzenetetracarboxylic dianhydride or benzophenontetracarboxylic dianhydride, and
• (b) a compound of formula I ##STR10## wherein A is linear or branched C.sub.2 -C.sub.20 alkylene;
• C.sub.5 -C.sub.7 cycloalkylene which is unsubstituted or substituted by one or more C.sub.1 -C.sub.6 alkyl groups;
• C.sub.7 -C.sub.10 bicycloalkylene which is unsubstituted or substituted by one or more C.sub.1 -C.sub.6 alkyl groups;
• or C.sub.1 -C.sub.30 alkylene containing one or more than one C.sub.5 -C.sub.7 cycloalkylene group or C.sub.7 -C.sub.10 bicycloalkylene group in the main or side chain, which cycloalkylene and bicycloalkylene groups are unsubstituted or substitltd by one or several C.sub.1 -C.sub.6 alkyl groups;
• and R.sub.1 and R.sub.2 are independently of each other C.sub.1 -C.sub.18 alkyl, C.sub.4 -C.sub.10 cycloalkyl or C.sub.7 -C.sub.24 aralkyl, which cycloalkyl and aralkyl groups can be unsubstituted or substituted by one or more than one C.sub.1 -C.sub.6 alkyl group.