Process for production of polycarbonate
A technology of polycarbonate and a manufacturing method, which is applied to the manufacturing field of polycarbonate and can solve the problem that the improvement of heat resistance cannot be said to be sufficient.
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[0040] [Manufacture of polycarbonate oligomer]
[0041] Bisphenol A was dissolved in a 5.6 mass % sodium hydroxide aqueous solution so that the bisphenol A concentration became 13.5 mass %, and the bisphenol A sodium hydroxide aqueous solution was prepared.
[0042] The aqueous sodium hydroxide solution of bisphenol A was supplied to a tubular reactor with an inner diameter of 6 mm and a tube length of 30 m at a flow rate of 41 l / hour, dichloromethane at a flow rate of 17 l / hour, and phosgene at a flow rate of 4.0 kg / hour. middle. The tubular reactor has a jacket part, and cooling water is passed through the jacket part to keep the temperature of the reaction solution below 40°C.
[0043] The reaction solution from the tubular reactor is continuously introduced into a trough reactor with a clapboard with an inner volume of 40 liters with a retreating wing, and then adding bisphenol A sodium hydroxide aqueous solution 2.8l / hr, 25 mass % sodium hydroxide aqueous solution 0.07 ...
Embodiment 1
[0050] The dichloromethane solution A48 l / hr of the above polycarbonate, 0.73 l / hr of a methylene chloride solution containing 2.0% by mass of the phenyl chloroformate (a) described in Table 1, and 0.07 equivalent of an aqueous sodium hydroxide solution 8.0 l / hr was continuously mixed with a pipeline mixer, and the mixed solution was passed through a pipe with an inner diameter of 40 mm and a length of 8 m, and then the aqueous phase was removed with a centrifugal extractor to continuously obtain a dichloromethane solution of polycarbonate. In this case, the amount of phenyl chloroformate was 1.4 times mole of the polycarbonate terminal phenolic hydroxyl group.
[0051] The dichloromethane solution of polycarbonate thus obtained was washed with 0.2 N hydrochloric acid of 15% by volume relative to the dichloromethane solution of polycarbonate, and then washed with 15% by volume of dichloromethane solution of polycarbonate Wash with pure water, and make the conductivity after wa...
Embodiment 2
[0054] In Example 1, polycarbonate chips were obtained in the same manner except that the phenyl chloroformate (b) described in Table 1 was used instead of the phenyl chloroformate (a). Table 2 shows properties of the obtained polycarbonate chips.
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