INDUSTRIAL PRODUCTION PROCESS FOR HIGH-QUALITY AROMATIC POLYCARBONATE

Title:

INDUSTRIAL PRODUCTION PROCESS FOR HIGH-QUALITY AROMATIC POLYCARBONATE

Document Type and Number:

WIPO Patent Application WO/2007/063757

Kind Code:

A1

Abstract:

Disclosed is a specific process for producing a high-quality/high-performance aromatic polycarbonate free from discoloration and having excellent mechanical properties from a dialkyl carbonate and an aromatic dihydroxy compound stably, in an industrially large scale (e.g., 1 ton or more per hour) for a prolonged period of time (e.g., for 1000 hours or longer, preferably 3000 hours or longer, more preferably 5000 hours or longer). The process comprises the steps of: (I) producing a diaryl carbonate with two reactive distillation columns each having a specific structure; (II) purifying the diaryl carbonate to yield a highly pure diaryl carbonate; (III) preparing a molten prepolymer from an aromatic dihydroxy compound and the highly pure diaryl carbonate and treating the molten prepolymer with a guide contact flow-down type polymerizer having a specific structure to produce a desired aromatic polycarbonate; and (IV) recycling an aromatic monohydroxy compound, which is a by-product in the reaction in step (III), into step (I).

Inventors:

FUKUOKA SHINSUKE (JP)
MIYAJI HIRONORI (JP)
HACHIYA HIROSHI (JP)
MATSUZAKI KAZUHIKO (JP)

Application Number:

PCT/JP2006/323321

Publication Date:

June 07, 2007

Filing Date:

November 22, 2006

Export Citation:

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Assignee:

ASAHI KASEI CHEMICALS CORP (JP)
FUKUOKA SHINSUKE (JP)
MIYAJI HIRONORI (JP)
HACHIYA HIROSHI (JP)
MATSUZAKI KAZUHIKO (JP)

International Classes:

C08G64/30; B01D3/14; B01D3/22; C07C68/06; C07C69/96

Foreign References:

JP2005146050A	2005-06-09
JPH09255772A	1997-09-30
JPH09165443A	1997-06-24
JP2004211107A	2004-07-29
JP2002226573A	2002-08-14

Other References: