| 摘要 |
A method for making a phosphonitrile halide of the formula (X(PX2=N)aPX3))<+> A<-> wherein X represents a halogen, A represents X or (PX6)<->, and a is an integer of from 1 to 9, comprises a first step of reacting PX5 and a disilazane under cooling in an inert non-chlorinated solvent and a second step of heating the reaction mixture to at least 50 DEG C for a time sufficient to produce the phosphonitrile halide. The method may also include a third step of adding a cyclosiloxane of the formula ((CH3)2SiO)b, wherein b is an integer of from 3 to 6, to the reaction mixture resulting from the second step to form a phosphonitrile halide containing species of the formula Z-((CH3)2SiO)b-Z wherein Z is X or a group OPX2(NPX2)aNPX2-, the phosphonitrile halide containing species having at least one group of the formula OPX2(NPX2)aNPX2-. Also disclosed is the use of the phosphonitrile halide made by the method of the present invention as a catalyst for the polymerisation of organopolysiloxanes. |
