Aziridine functional compound

An aziridine compound having:

• a) one or two of the following structural units A:
• wherein
• R1 is H;
• R2 and R4 are independently chosen from H or an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms;
• R3 is an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms;
• R′ and R″ are according to (1) or (2):
• (1) R′═H or an aliphatic hydrocarbon group containing from 1 to 14 carbon atoms, and
• R″=an aliphatic hydrocarbon group containing from 5 to 14 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 4 to 14 carbon atoms and R″″ is an aliphatic hydrocarbon group containing from 1 to 14 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 14 carbon atoms and R″″″ being an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms,
• (2) R′ and R″ form together a saturated cycloaliphatic hydrocarbon group containing from 5 to 8 carbon atoms,
• R11 is H or an aliphatic hydrocarbon group containing from 1 to 14 carbon atoms, m is an integer from 1 to 6;
• b) one structural unit B:
• wherein
• p+q is an integer from 0 to 4;
• r is an integer from 0 to 2;
• X is NH or O or NR, wherein R contains at most 36 carbon atoms and optionally contains
• one or more heteroatoms in the chain;
• R5 and R6 are independently containing from 4 to 13 carbon atoms;
• R7 is a divalent group;
• and
• c) optionally one structural unit C:
• wherein
• Z is NH or O or NR wherein R contains at most 36 carbon atoms and optionally contains one or more heteroatoms in the chain;
• R8 is a monovalent group;
• and
• d) structural formula A-B-A or structural formula A-B-C;
• e) a molecular weight higher than 600 Daltons and at most 5000 Daltons, determined using MALDI-TOF mass spectroscopy;
• with the proviso that
• f) the mathematical sum of the molar mass of starting diisocyanate which provides carbodiimide functionality in the structural unit B+the molar mass of structural unit A+the molar mass of structural unit A is higher than 600 Daltons;
• and
• g) in case structural unit C is present, the mathematical sum of the molar mass of the starting diisocyanate which provides the carbodiimide functionality in the structural unit B+the molar mass of structural unit A+the molar mass of structural unit C is higher than 600 Daltons.