| abstract |
The present invention relates to a method for producing a polycarbonate resin, and more particularly, in a method for producing a polycarbonate resin in which a solid phase polymerization is carried out by crystallizing a prepolymer polymerized from an aromatic dihydroxy compound and a diaryl carbonate. After preparing the viscosity average molecular weight in the range of 4,000 to 18,000 g / mole, inert high-pressure gas was injected to prepare a prepolymer foam having fine pores, and then subjected to solid phase polymerization to prepare a polycarbonate resin, thereby reacting during solid phase polymerization. The phenol produced as a by-product is not only easily removed, and a method of preparing a polycarbonate resin capable of increasing molecular weight due to high polymerization rate without using a catalyst at all. |