Production method of aromatic polycarbonate

The object of the present invention is to provide a production method for an aromatic polycarbonate, in which eye boogers at the time of extrusion molding are reduced, and a continuous operation for a long period of time is possible. The present invention relates to a method when an extrusion moldin...

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Bibliographische Detailangaben
Hauptverfasser:	MURAKAMI HIDEKI, UCHIMURA RYUUJI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The object of the present invention is to provide a production method for an aromatic polycarbonate, in which eye boogers at the time of extrusion molding are reduced, and a continuous operation for a long period of time is possible. The present invention relates to a method when an extrusion molding is produced using an extruder in which a tapered part 1 has a half apex angle of from 4 to 20° formed at the outlet part of a die hole 9, and outlet parts of plural die holes 9 are arranged in a staggered state at the resin discharge surface side of a die plate 10, the shear rate γ at the extruder outlet is from 100 to 500 sec−1, and the shear stress τ is from 50 to 200 kPa.