The present invention is concerned with a new class of compounds prepared by reacting cyclic aminals of the formula ##STR1## with polyisocyanates of the formula R.sub.5 (NCO).sub.m+n to yield ##STR2## and with this process for obtaining said compounds, as well as the use of such compounds in polyurethane chemistry. If such compounds are free of isocyanates (n=0) they are useful as latent cross-linkers or hardeners activatable by heat or moisture. If such compounds carry free isocyanate groups (n=1 or 2) there are useful as synthetic resin precursors. In the above formulae m represents an integer of from 1 to 3, and n represents 0, 1 or 2, and the sum of m+n is 2 or 3, R.sub.1 represents an aliphatic hydrocarbon group which is optionally cyano-substituted and which has from 1 to 6 carbon atoms, a cycloaliphatic hydrocarbon group having from 5-10 carbon atoms or an araliphatic hydrocarbon group having from 7-10 carbon atoms; R.sub.2 represents a divalent aliphatic hydrocarbon group having from 2 to 6 carbon atoms, at least two carbon atoms being situated between the two nitrogen atoms; R.sub.3 and R.sub.4 are identical or different and represent hydrogen, aliphatic hydrocarbon groups having from 1 to 18 carbon atoms, cycloaliphatic hydrocarbon groups having from 5 to 10 carbon atoms or aromatic hydrocarbon groups having from 6 to 10 carbon atoms, or the two groups R.sub.3 and R.sub.4 together with the carbon atom of the heterocyclic ring may also form a 5-membered or 6-membered cycloaliphatic ring; and R.sub.5 represents an (m+n)-valent group such as that which can be obtained by the removal of m+n isocyanate groups from an (m+n)-valent polyisocyanate.
本发明涉及一种新的化合物类别,其由公式##STR1##的环状胺与公式R.sub.5(NCO).sub.m+n的多
异氰酸酯反应制备而成,得到##STR2##以及获得此类化合物的方法,以及在聚
氨酯
化学中使用此类化合物。如果这些化合物不含
异氰酸酯(n=0),则它们可用作由热或湿度激活的潜在
交联剂或硬化剂。如果这些化合物带有游离的
异氰酸酯基团(n=1或2),则它们可用作合成
树脂前体。在上述公式中,m表示1到3的整数,n表示0、1或2,m+n的和为2或3,R.sub.1表示一种脂肪族碳氢基团,可选地具有1到6个碳原子的
氰基取代,具有5-10个碳原子的环脂族碳氢基团或具有7-10个碳原子的芳基脂族碳氢基团;R.sub.2表示具有2到6个碳原子的二价脂肪族碳氢基团,两个碳原子至少位于两个氮原子之间;R.sub.3和R.sub.4相同或不同,表示氢,具有1到18个碳原子的脂肪族碳氢基团,具有5到10个碳原子的环脂族碳氢基团或具有6到10个碳原子的芳基碳氢基团,或者R.sub.3和R.sub.4这两个基团与杂环环上的碳原子一起形成一个5-成员或6-成员的环脂族环;R.sub.5表示(m+n)-价基团,例如可以通过从(m+n)-价多
异氰酸酯中去除m+n个
异氰酸酯基团获得的基团。