Further suitable difunctional components are diphenols other than bisphenol A, such as 2,2,-bis-(3,5-dibromo-4-hydroxyphenyl)-propane (page 10, lines 20 to 29).According to Example 1, a 16.4% strength polycarbonate/methylene chloride solution prepared by the phase boundary process is introduced at the top of a distillation column, operated at normal pressure.