| abstract |
The present invention relates to a process for the preparation of polycarbonates, more specifically to a process for the preparation of polycarbonates by a solid polymerization of prepolymers obtained by the polymerization between aromatic dihydroxides and diarylcarbonates, which comprises:a) preparing said prepolymer having a viscosity average molecular weight of 4,000-18,000 g/mole;b) preparing a microporous foam by injecting high-pressure inert gas; andc) preparing polycarbonates by a solid polymerization,which facilitates the removal of phenol, a by-product, and enhances molecular weight of polycarbonates without using any catalyst due to the relatively high polymerization rate. |