High molecular weight radiation curable resins

The diisocyanate derivative of the formula:

• ##STR12## wherein X is an aromatic hydrocarbon, cycloaliphatic hydrocarbon or aliphatic hydrocarbon group containing 4 to 38 carbon atoms, R is an aliphatic hydrocarbon or aromatic hydrocarbon group containing four to eight carbon atoms, R' is hydrogen or a methyl group, R" is an aliphatic hydrocarbon group containing two to eight carbon atoms with the proviso that the aliphatic hydrocarbon group can contain ether linkages, R"' is an aliphatic hydrocarbon group containing two to eight carbon atoms with the priviso that the aliphatic hydrocarbon group can contain ether linkages, R" and R"' when containing ether linkages have the formulae (--R.sub.a --O--R.sub.b)--, --(R.sub.a --O--R.sub.b --O--R.sub.c)-- or --(R.sub.a --O--R.sub.b --O--R.sub.c --O--R.sub.d)-- wherein R.sub.a, R.sub.b, R.sub.c, and R.sub.d are alkylene groups containing in total from four to eight carbon atoms, and n is an integer from two to five.