| 摘要 |
Phosphoramidates of the general formula <FORM:1025814/C2/1> wherein R1 represents a hydrocarbyl or halohydrocarbyl radical and R2 a lower alkylene radical and each of R1 in (R1O)2 may be the same or different, are prepared according to one of the following equations: <FORM:1025814/C2/2> In an example, O,O-diethyl N,N-bis-(2-hydroxyethyl) phosphoramidate is prepared by reacting diethyl phosphite and diethanolamine in CCl4 at 0 DEG C. and then adding triethylamine dropwise.ALSO:The invention comprises the reaction product of an organic polyisocyanate and a phosphoramidate of formula <FORM:1025814/C3/1> where R1 is a (halo) hydrocarbyl alkyl or aryl radical and R2 is a lower alkylene radical. The phosphoramidate may be used wholly or in part as the hydroxyl group containing substance. The reaction product may be foamed using water or a halohydrocarbon. In the examples the following phosphoramidates are used: O,O - diethyl - N,N - bis -(2 - hydroxyethyl)phosphoramidate; O,O - bis - (2 - chloroethyl) - N,N - bis - (2 - hydroxyethyl)phosphoramidate; O,O - di - n - propyl - N,N - bis -(2-hydroxyethyl)phosphoramidate; O,O - dimethyl - N,N - bis - (2 - hydroxyethyl)phosphoramidate together with toluene diisocyanate and a polyether. |
