A process for {HEAD ~ the ring} opening {TAIL ~ polymerisation} of cyclosiloxanes, which comprises contacting a cyclosiloxane with 1 500 ppm by 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 
opening
A process for { HEAD ~ the ring } opening { TAIL ~ polymerisation } of cyclosiloxanes , which comprises contacting a cyclosiloxane with 1 500 ppm by 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 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH