| abstract |
From molten prepolymers of aromatic polycarbonates obtained from aromatic dihydroxy compounds and diaryl carbonates, from 1 to 50 tonnes per hour of high-quality, high-performance aromatic polycarbonates with excellent mechanical properties and no coloration are produced. Practical method for stable production for a long time on a small scale. In particular, the molten prepolymer of the aromatic polycarbonate obtained by reacting the aromatic dihydroxy compound with the diaryl carbonate is polymerized by a guide-catalytic fall polymerizer of a specific structure, so that the mechanical properties are high and there is no coloration. Melting a high performance aromatic polycarbonate, comprising being capable of stably producing at least 1000 hours of extended time, such as 5,000 hours or more, at a production rate of 1 to 50 tons per hour, without any variation in molecular weight or the like Industrial scale production of aromatic polycarbonates in accordance with the process is provided. |