Novel bis cyclic ureas are disclosed having the formula ##STR1## WHEREIN C.sub.n H.sub.2 n represents alkylene from 4 to 12 inclusive and provided there are at least 4 carbon atoms in succession in the chain and R is the residue obtained by the removal of both halogen atoms from a diacid halide. The bis cyclic ureas are easily converted to a novel class of aliphatic diisocyanates simply by heating. Alternatively, they are blended with polymeric polyols to form one-component storage stable compositions which are thermally converted to polyurethane resins without any significant volatile or side product formation.
揭示了具有以下公式的新型双环
脲:##STR1##其中C.sub.n H.sub.2 n代表碳原子数为4至12的烷基,并且链中至少有4个相连的碳原子,R是通过从二酸卤化物中去除两个卤原子得到的残基。这些双环
脲可以通过简单加热轻松转化为一种新型的脂肪族二
异氰酸酯。或者,它们与聚合物聚醇混合以形成一组分存储稳定的组合物,这些组合物在热转化为聚
氨酯
树脂时不会产生任何显著的挥发性或副产物。