Condensation polymers from diisocyanates and dioximes

Diisocyanates condense readily with the two active hydrogen atoms in dioximes to give high molecular weight linear condensation polymers. In several cases these polymers, such as the one from cyclohexanedione dioxime and 4,4′‐biphenylene diisocyanate, magnified image may be converted to tough films or fibers. Thermal, hydrolytic, and light stability of these polymers were in general poor.