Multi-aziridine compound

A multi-aziridine compound having:

• a) at least 2 of the following structural units (A):
• whereby
• R1 is H;
• R2 and R4 are independently chosen from H, a linear group containing from 1 to 8 carbon atoms and optionally containing one or more heteroatoms, a branched or cyclic group containing from 3 to 8 carbon atoms and optionally containing one or more heteroatoms, phenyl, benzyl, or pyridinyl;
• R3 is chosen from a linear group containing from 1 to 8 carbon atoms and optionally containing one or more heteroatoms, a branched or cyclic group containing from 3 to 8 carbon atoms and optionally containing one or more heteroatoms, phenyl, benzyl, or pyridinyl;
• or R2 and R3 (in case R2 is different than H) may be part of the same cyclic group containing from 3 to 8 carbon atoms;
• R′ and R″ are independently H or an aliphatic hydrocarbon group containing from 1 to 12 carbon atoms,
• whereby all structural units (A) are connected, through the carbon termini of the respective units (A), to at least one other structural unit (A) by a O-terminated fragment or a N-terminated fragment, whereby a O-terminated fragment is the fragment obtained by removing the H atom of at least 2 hydroxyl groups on a polyol, and a N-terminated fragment is the fragment obtained by removing one H atom of at least 2 amine groups on a polyamine or by removing both H atoms of a compound containing one NH2 functionality;
• and
• b) a molecular weight of from 600 to 20000 Daltons, wherein the molecular weight is determined using MALDI-TOF mass spectrometry.