Polyamines and their use in coating compositions

A polyamine which is the reaction product of

• a) an unsaturated oligoester which and has an average of 2 to 4 double bonds per molecule and is
• i) the transesterification product of an acid component comprising a member selected from the group consisting of di(cyclo)alkyl esters of maleic and fumaric acid with a hydroxyl component comprising a member selected from the group consisting of diols, triols and tetraols having a molecular weight of 1000 or less or
• ii) the esterification product of an acid component comprising a member selected from the group consisting of maleic anhydride, maleic acid and fumaric acid with a hydroxyl component comprising a member selected from the group consisting of diols, triols and tetrols having a molecular weight of 1000 or less and monoalcohols having 1 to 10 carbon atoms,
• such that one mole of the acid component is reacted for each hydroxyl group of the hydroxyl component and
• b) optionally other unsaturated compounds suitable as Michael addition acceptors and having an average of 1 to 4 double bonds per molecule with
• c) (cyclo)aliphatic diamines having two primary amino groups and corresponding to the formula
• NH.sub.2 --R--NH.sub.2
• wherein
• R represents a C.sub.2 -C.sub.24 aliphatic group or C.sub.3 -C.sub.2, cycloaliphatic group, and
• d) optionally other amino-functional compounds suitable as Michael addition donors.