Patent ID: 9617380
Date: 2017-04-11
CPC Classifications: C08G

Claim:
1. A process of purifying a polycarbonate comprising: polymerizing a dihydroxy compound and a carbonate source via an interfacial reaction in the presence of a catalyst to form a product mixture comprising an aqueous phase and an organic phase, wherein the organic phase comprises the polycarbonate, the catalyst, ions, and a solvent having a boiling point T heating the product mixture to a temperature greater than or equal to the boiling point T separating the aqueous phase and the organic phase of the heated product mixture at a temperature greater than or equal to the boiling point T extracting the catalyst from the separated organic phase; and extracting the ions from the separated organic phase to form a purified polycarbonate; wherein if a centrifuge is used in the extracting of the catalyst, the extracting of the ions, or both, the process further comprises cooling a stream entering the centrifuge to a temperature less than the boiling point T