Crosslinkable thermoplastic polyurethane resins containing ethylenic side groups

Crosslinkable thermoplastic polyurethane resin containing ethylenic side groups, which is the product of the reaction of:

• (a) an organic diisocyanate,
• (b) a long-chain saturated linear diol having a molecular weight of between 450 and 4,000,
• (c) an aliphatic, cycloaliphatic or aromatic compound having a molecular weight of less than 300, which contains 2 to 20 carbon atoms and possesses two groups having at least one hydrogen atom which is active towards the NCO groups, and
• (d) an unsaturated diol consisting of the acrylic or methacrylic acid ester of a trihydric alcohol, of the formula:
• ##STR13## in which R.sub.1 and R.sub.2, which are identical or different, are hydrogen, a lower alkyl group, an aryl group or a halogen, R.sub.3 is hydrogen, a lower alkyl, aryl or cycloalkyl group or a halogen and n is 1, 2, 3 or 4 the diisocyanate compound (a) being present in a ratio NCO:
• group having at least one H which is active towards the NCO groups, which is less than or equal to 1.1, the molar ratio diol (b):
• compounds (c)+(d) being between 0 and 10 and the molar ratio compound (c):
• unsaturated diol (d) being between 0 and 10 if b.noteq.0 and between 1 and 10 if b=0.