PROCESS FOR POLYMERIZING CYCLIC DIORGANOSILOXANE OLIGOMERS IN A SUPRAATMOSPHERIC-PRESSURE FLUID WHICH IS GASEOUS AT NORMAL PRESSURE

摘要

1. Process for acid- or base-catalysed polymerization of polydiorganosiloxane oligomers with a view to obtaining a polydiorganosiloxane of high molecular mass, characterized in that the polymerization is carried out in at least one fluid under supraatmospheric pressure, which is a gas under normal conditions of temperature and of pressure, the physical state of the said fluid being during the polymerization chosen from the state of a gas under supraatmospheric pressure, the liquid state and the supercritical state and in that the polydiorganosiloxane of high molecular mass is recovered by expansion of the said fluid.