Filter device for polycarbonate and production method for polycarbonate
AssigneeTeijin Limited
InventorsMasahiro Murakami, Yoshiki Matsuoka, Toru Sawaki, Katsushi Sasaki
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Abstract
Provided are a filtration apparatus for a polycarbonate comprising a filtration container, a flange plate, one or more leaf disc-type filters, a filter press and a center pole having an integral construction with the filter press as constituting elements, these components having specific structures, and a process for manufacturing a polycarbonate using the filtration apparatus. Foreign materials are effectively removed by using the polymer filter, and at the same time, discoloring, crosslinking and gel formation, which would occur in the filter, are suppressed; and as a result, a polycarbonate having excellent quality can be manufactured.
Claims8
A filtration apparatus for a polycarbonate comprising as constituent elements:
- (a) a filtration container having a polymer inlet passage and an opening;
- (b) a flange plate interfitting with the opening;
- (c) one or more leaf disc-shaped filters for filtering a polymer introduced into the filtration container through the polymer inlet passage;
- (d) a filter presser for fixing the disc-shaped filters to each other and applying sealing pressure on junction parts of the leaf disc-shaped filters;
- and
- (e) a center pole placed on a space formed by inner circumferences of the leaf disc-shaped filters, for collecting the polymer filtered by the leaf disc-shaped filters and for discharging it outside the filtration apparatus, and integrated with the filter presser, wherein the center pole includes a penetration part that penetrates the flange plate, the flange plate has a sealing part for preventing the intrusion of a polymer down along the center pole into the penetration part of the center pole on a filtration container side of the flange plate, and the flange plate has a fixture nut for fixing the center pole with the flange plate on a side opposite to the filtration container of the flange plate.
Dependencies are inferred from the claim text.