METHOD OF ADDING A CATALYST IN A MELT POLYMERIZATION PROCESS AND THE POLYCARBONATE POLYMERIZED THEREFROM

摘要

In an embodiment, a process of preparing a reduced activity first catalyst comprises preparing an aqueous solution I comprising a first catalyst I; preparing an aqueous solution I comprising a first catalyst II; combining the solution I and the solution II to form a solution III comprising the reduced activity first catalyst. In another embodiment, a process of preparing a polycarbonate comprises polymerizing reactants in the presence of a catalyst comprising one or both of the reduced activity first catalyst and a second catalyst, wherein the second catalyst is one or both of a high temperature second catalyst or a second catalyst with a reduced metal content.