Aromatic diisocyanates containing N,N-disubstituted sulfonamide groups and processes for their production

摘要

Diisocyanates corresponding to the formula <IMAGE> in which R1, R2, R3, R4, R5 and R6 (an isocyanate-containing radical) are as defined herein are made by several processes. These diisocyanates may be made by phosgenating the diamine in which the diisocyanate is based. They may also be produced by treating the bis-urethane of the tertiary alcohol corresponding to the diisocyanate with phosgene. Such diisocyanates may also be made by treating a specific type of bis-urea with hydrogen chloride. The diisocyanates corresponding to the above-given formula are particularly useful in the production of polyurethanes having good flame-proof and mechanical properties.