Unconventional Chemistry of Isocyanates

Abstract

This article focuses attention on new uses of isocyanates. m-Phenylenedisulfonyl diisocyanate has been synthesized by direct phosgenation of disulfonamide in presence of catalytic amount of n-butyl isocyanate. Urethanes thusly derived are color stable. A variety of temperature stable heterocyclic polymers have been synthesized by reacting diisocyanates with tetrafunctional mono mers, e.g. diphenylester of resorcinol dicarboxylic acid. Heat stable foams can also be produced by cyclotrimerization of di and poly isocyanates. Within the next ten years, tailor-made polymers for many new applications will be synthesized and diisocyanates will play an important role.