A method for the manufacture of a polycarbonate which comprises reacting a
carbonate precursor with a dihydroxy compound in the presence of an
aqueous base in an inert organic solvent optionally containing a
molecular weight regulator to form an oligomeric polycarbonate, wherein
the reaction between the dihydroxy compound and the carbonate precursor
is about 80 to about 99% completed; removing the inert organic solvent
and the aqueous base to isolate the oligomeric polycarbonate; and
transesterifying the isolated oligomeric polycarbonate to form a
polymeric polycarbonate at a temperature and pressure effective to remove
trace amounts of residual solvent. This method eliminates some of the
problems of the prior art such as the removal of solvent from high
molecular weight polycarbonate, which is both cumbersome, energy
intensive and expensive.