Multi-aziridine compound

A multi-aziridine compound having:

• a) from 2 to 6 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 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′═H or an aliphatic hydrocarbon group containing from 1 to 12 carbon atoms;
• R″ is an aliphatic hydrocarbon group containing from 1 to 12 carbon atoms, a cycloaliphatic hydrocarbon group containing from 5 to 12 carbon atoms, an aromatic hydrocarbon group containing from 6 to 12 carbon atoms, CH2—O—(C═O)—R′″, CH2—O—R″″, or CH2—(OCR′″″HCR′″″H)n—OR″″″, whereby R′″ is an aliphatic hydrocarbon group containing from 1 to 12 carbon atoms and R″″ is an aliphatic hydrocarbon group containing from 1 to 12 carbon atoms or an aromatic hydrocarbon group containing from 6 to 12 carbon atoms, n being from 1 to 35, R′″″ independently being H or an aliphatic hydrocarbon group containing from 1 to 12 carbon atoms and R″″″ being an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms;
• or R′ and R″ may be part of the same saturated cycloaliphatic hydrocarbon group containing from 5 to 8 carbon atoms;
• m is an integer from 1 to 6;
• b) one or more linking chains wherein each one of these linking chains links two of the structural units A and wherein the linking chain is a shortest chain of consecutive atoms that links two structural units A;
• and
• c) a molecular weight in the range from 600 Daltons to 5000 Daltons.