METHOD FOR PRODUCING AROMATIC POLYCARBONATE

PROBLEM TO BE SOLVED: To provide a technology for producing an aromatic polycarbonate free from quality deterioration in a gear pump, excellent in color tone and little in a foreign material content even in the case where a production plant has been scaled up. SOLUTION: When an aromatic polycarbonat...

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Hauptverfasser: SHIMONARI MASASHI, SAWAKI TORU, SASAKI KATSUJI, MATSUMOTO KYOSUKE
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creator SHIMONARI MASASHI
SAWAKI TORU
SASAKI KATSUJI
MATSUMOTO KYOSUKE
description PROBLEM TO BE SOLVED: To provide a technology for producing an aromatic polycarbonate free from quality deterioration in a gear pump, excellent in color tone and little in a foreign material content even in the case where a production plant has been scaled up. SOLUTION: When an aromatic polycarbonate is produced by melt polycondensation, a self-lubricating-type gear pump is used for transferring a melt reaction mixture from a reaction apparatus. The flow rate Q (cm3/sec) of the reaction mixture which is continuously fed to a shaft seal part of the gear pump is controlled so that it satisfies the following relation: Q/S>=0.1 (cm/sec) (wherein, S is the sectional area (cm2) of a flow path placed to supply the reaction mixture to the shaft-seal part).
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subjects CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
title METHOD FOR PRODUCING AROMATIC POLYCARBONATE
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