Heterocyclic diisocyanates and a process for making polyurethanes and polyurethane-ureas

摘要

Novel heterocyclic diisocyanates are prepared by reacting a urea diisocyanate of the formula ##STR1## IN WHICH B is a divalent organic radical and n is an integer of 1 to 3 with a compound having the formula ##EQU1## IN WHICH Y IS --C--C--; --C--S--; --C--N--C--; --S--N--C. The novel heterocyclic diisocyanates are useful in making polyurethanes and polyurethane-ureas having improved chemical and temperature resistance.