| 摘要 |
PURPOSE:In preparing a carbonate bond-containing resin using phosgene as a raw material, to prevent occurrence of acidic components in pelletizing and in molding and to improve color tone of pellets and molded pieces, by using phosgene having carbon tetrachloride concentration of <= a specific value. CONSTITUTION:In obtaining a carbonate bond-containing resin by using phosgene as a raw material, phosgene having carbon tetrachloride concentration reduced to <=200ppm, preferably <=150ppm, preferably by distillation is used.
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