| 摘要 |
A METHOD FOR PRODUCING AN AROMATIC POLYCARBONATE COMPRISES FEEDING TO A FEEDING ZONE (HAVING A FORAMINOUS PLATE) AT LEAST ONE POLYMERIZING MATERIAL SELECTED FROM THE GROUP CONSISTING OF A) A MOLTEN MONOMER MIX TURE OF AN AROMATIC DIHYDROXY COMPOUND AND A DIARYL CARBONATE, AND B) A MOLTEN PREPOLYMER OBTAINED BY A PROCESS COMPRISING REACTING AN AROMATIC DIHYDROXY COMPOUND WITH A DIARYL CARBONATE, AND ALLOWING THE POLYMERIZING MATERIAL TO PASS DOWNWARDLY THROUGH THE FORAMINOUS PLATE AND FALL ALONG AND IN CONTACT WITH A WIRE THROUGH A WIRE-WETTING FALL POLYMERIZATION REACTION ZONE, THEREBY EFFECTING POLYMERIZATION OF THE POLYMERIZING MATERIAL DURING THE WIRE-WETTING FALL THEREO.F. COLORLESS AND HIGH QUALITY AROMATIC POLYCARBONATES ARE THUS STABLY PRODUCED AT A HIGH POLYMERIZATION RATE FOR A PROLONGED PERIOD OF TIME, USING ANAPPARATUS WHICH HAS EXCELLENT SEALING PROPERTIES UNDER HIGH VACUUM AND MAILLTENANCE OF WHICH IS .EASY. (FIG. 3)
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