Production method of aromatic polycarbonate
AssigneeMitsubishi Chemical Corporation
InventorsRyuuji Uchimura, Hideki Murakami
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Abstract
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.
Claims5
A production method of an aromatic polycarbonate, characterized in that in a method for extrusion molding an aromatic polycarbonate with an extruder and pelletizing the same, extrusion molding is conducted under that
- a shear rate (γ) at an outlet of the extruder is in a range of from 100 to 500 sec−1, and
- a shear stress (τ) at the outlet of the extruder is in a range of from 50 to 200 kPa.
Dependencies are inferred from the claim text.