The polycarbonate is held in solution in the organic layer. This solution is then run off from the aqueous layer and is either evaporated to form granules of the polymer or ethanol is added to precipitate the solid polymer.
However, an increasing proportion of polycarbonates is made via diphenyl carbonate, in order to eliminate the use of carbonyl chloride, an extremely poisonous gas.
Bisphenol A and the ester are heated together to form a molten mass of polymer: