Patent ID: 7129315

Claim:
In the process for producing polycarbonate by interfacial polymerization the improvement comprising (a) evaporating the organic solvent from the solution that comprises solvent and polycarbonate to obtain a melt that contains 90 to 99.95% polycarbonate, the percent being relative to the weight of the melt, and (b) passing the melt through inlet openings of a separating vessel to obtain a plurality of streams of polycarbonate, on entry into the inlet openings said melt being supersaturated with volatile constituents to an extent of at least 1 bar and having a temperature of 250° to 340° C. and a flow rate of 0.1 to 20 kg/hour, and (c) degassing the streams in the separating vessel wherein the pressure is 0.1 to 20 mbar to effect degassing of the polycarbonate and (d) obtaining polycarbonate containing less than 250 ppm of volatile constituents.