abstract |
Provided is a method for producing a granularnpolycarbonate prepolymer for solid-phase polymerization,ncomprising dissolving a polycarbonate prepolymer in ansolvent under heat, then crystallizing it by cooling, andnshaping it. n The grains of the granular prepolymer hardly fusentogether in polymerization, and the granular prepolymer isnsuitable for high-speed solid-phase polymerization to givenpolycarbonate. |