The present invention relates to a process for the preparation of polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting: (a) polyisocyanate, (b) a compound having a molecular weight of from 400 to 10,000 containing at least two isocyanate-reactive hydrogen atoms and (c) a dialkoxy-phosphonyl-N-alkyl-formic acid amide of the formula: ##STR1## wherein m represents an integer of from 1 to 3, n represents an integer of from 0 to 8, X represents halogen, hydrogen, C.sub.1 to C.sub.6 alkyl, -OR, or ##STR2## R represents C.sub.1 to C.sub.6 alkyl, R.sub.1 represents hydrogen, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkylene, C.sub.6 to C.sub.10 aryl or C.sub.6 to C.sub.10 arylene, and R.sub.2 and R.sub.3, which may be the same or different, represent C.sub.1 to C.sub.10 alkyl in the presence of water and/or blowing agent. The present invention also relates to dialkoxy-phosphonyl-N-formic acid amides.
本发明涉及一种制备聚
氨酯泡沫的方法,该泡沫能够进行火焰层压和高频焊接,包括反应:(a)聚
异氰酸酯,(b)分子量在400至10,000之间的化合物,含有至少两个异
氰酸反应性氢原子,和(c)具有以下结构的二烷氧基
磷酰-N-烷基
甲酸酰胺:##STR1## 其中m表示1到3的整数,n表示0到8的整数,X表示卤素、氢、C.sub.1到C.sub.6烷基、-OR或##STR2## R表示C.sub.1到C.sub.6烷基,R.sub.1表示氢、C.sub.1到C.sub.10烷基、C.sub.1到C.sub.10亚烷基、C.sub.6到C.sub.10芳基或C.sub.6到C.sub.10芳亚烷基,R.sub.2和R.sub.3,可以相同也可以不同,表示C.sub.1到C.sub.10烷基,在
水和/或发泡剂的存在下进行。本发明还涉及二烷氧基
磷酰-N-
甲酸酰胺。