Title:
芳香族ポリカーボネートを効率的に製造する方法
Document Type and Number:
Japanese Patent JP4181601
Kind Code:
B2
Abstract:
It is a task of the present invention to provide a method which enables the production of a high quality, high performance aromatic polycarbonate (which is colorless and has excellent mechanical properties) from a molten aromatic polycarbonate prepolymer obtained from an aromatic dihydroxy compound and a diaryl carbonate, wherein the polycarbonate can be stably produced on a commercial scale at 1 to 50 t/hr for a long time without the need for a large amount of an inert gas. In the present invention, this task has been accomplished by a method for producing an aromatic polycarbonate by the melt transesterification process, in which the prepolymer is caused to absorb a specific amount of an inert gas, followed by polymerization using a guide-wetting fall polymerizer device having a specific structure, whereby a high quality, high performance aromatic polycarbonate as mentioned above can be stably produced on a commercial scale at 1 to 50 t/hr for a long time (more than several thousand hours, e.g., as long as 5,000 hours) without fluctuation of the molecular weight thereof.
Inventors:
Shinichi Fukuoka
Hiroshi Hachiya
Kazuhiko Matsuzaki
Hiroshi Hachiya
Kazuhiko Matsuzaki
Application Number:
JP2006514605A
Publication Date:
November 19, 2008
Filing Date:
June 14, 2005
Export Citation:
Assignee:
Asahi Kasei Chemicals Corporation
International Classes:
C08G64/30; C08G64/04; C08G64/06; C08G64/20
Domestic Patent References:
| JP9110978A | ||||
| JP2005121210A | ||||
| JP2002249575A |
Foreign References:
| WO1999064492A1 | ||||
| WO1999036457A1 | ||||
| WO1999065970A1 | ||||
| WO1997022650A1 |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Shinji Oga
Toshifumi Onuki
Shinji Oga
Toshifumi Onuki
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