申请人:Bayer Aktiengesellschaft
公开号:US04594441A1
公开(公告)日:1986-06-10
A process for the preparation of urethanes. Urethanes having the general formula R.sub.1 (NHCOOR.sub.2).sub.n are reacted with an alcohol at a temperature of 120.degree. to 400.degree. C. in amounts such that, for every mol of the urethane, at least one mol of the alcohol is present. R.sub.1 is a radical obtained by removing the isocyanate groups from an n-functional organic isocyanate, which isocyanate has a boiling point greater than 100.degree. C. at atmospheric pressure. R.sub.2 is a radical obtained by removing the hydroxyl group from a monohydric alcohol which has a boiling point greater than 140.degree. C. at atmospheric pressure.
一种制备脲酯的方法。具有一般公式R.sub.1(NHCOOR.sub.2).sub.n的脲酯与醇在温度为120°C至400°C的条件下反应,反应物的量使得对于每摩尔脲酯至少存在一摩尔醇。其中,R.sub.1是通过从n-官能羟基异氰酸酯中去除异氰酸基而获得的基团,该异氰酸酯在常压下的沸点大于100°C。R.sub.2是通过从在常压下的沸点大于140°C的一元醇中去除羟基而获得的基团。