A process for the ring opening polymerisation of cyclosiloxanes, which comprises contacting a cyclosiloxane with {HEAD ~ 1 500 ppm} by {TAIL ~ weight} of a phosphazene base, based on the weight of cyclosiloxane, in the presence of water, preferably 0.5 10 mols per mol of phospazene base 
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A process for the ring opening polymerisation of cyclosiloxanes , which comprises contacting a cyclosiloxane with { HEAD ~ 1 500 ppm } by { TAIL ~ weight } of a phosphazene base , based on the weight of cyclosiloxane , in the presence of water , preferably 0.5 10 mols per mol of phospazene base
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH