摘要:
Siloxanes are polymerised by equilibration, condensation and/or ring-opening polymerisation using a phosphazene base catalyst. A linear phosphazene base catalyst of the general formula wherein R denotes a C 1-10 hydrocarbon or wherein two R groups on one N atom form with the N atom a heterocyclic group, X denotes an anion and n is from 1 to 10 is prepared by reacting a linear phosphonitrile halide compound with a secondary amine or a salt of a secondary amine or a metal amide thereof to form an aminated phosphazene material, followed by an ion exchange reaction replacing the anion with a nucleophile.
摘要:
Siloxanes are polymerised by equilibration, condensation and/or ring-opening polymerisation using a phosphazene base catalyst. A linear phosphazene base catalyst of the general formula wherein R denotes a C 1-10 hydrocarbon or wherein two R groups on one N atom form with the N atom a heterocyclic group, X denotes an anion and n is from 1 to 10 is prepared by reacting a linear phosphonitrile halide compound with a secondary amine or a salt of a secondary amine or a metal amide thereof to form an aminated phosphazene material, followed by an ion exchange reaction replacing the anion with a nucleophile.
摘要:
A method for making a phosphonitrile halide of the formula (X(PX 2 =N) a PX 3 )) + A - wherein X represents a halogen, A represents X or (PX 6 ) - , and a is an integer of from 1 to 9, comprises a first step of reacting PX 5 and a disilazane under cooling in an inert non-chlorinated solvent and a second step of heating the reaction mixture to at least 50°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 ((CH 3 ) 2 SiO) 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-((CH 3 ) 2 SiO) b -Z wherein Z is X or a group OPX 2 (NPX 2 ) a NPX 2 -, the phosphonitrile halide containing species having at least one group of the formula OPX 2 (NPX 2 ) a NPX 2 -. 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.
摘要:
A method for making a phosphonitrile halide of the formula (X(PX 2 =N) a PX 3 )) + A - wherein X represents a halogen, A represents X or (PX 6 ) - , and a is an integer of from 1 to 9, comprises a first step of reacting PX 5 and a disilazane under cooling in an inert non-chlorinated solvent and a second step of heating the reaction mixture to at least 50°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 ((CH 3 ) 2 SiO) 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-((CH 3 ) 2 SiO) b -Z wherein Z is X or a group OPX 2 (NPX 2 ) a NPX 2 -, the phosphonitrile halide containing species having at least one group of the formula OPX 2 (NPX 2 ) a NPX 2 -. 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.