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Title:
METHOD FOR CONTINUOUSLY PRODUCING HIGH-MOLECULAR-WEIGHT POLYCARBONATE RESIN
Document Type and Number:
WIPO Patent Application WO/2013/172317
Kind Code:
A1
Abstract:
Provided is an improved method for continuously producing a high-molecular-weight polycarbonate resin by subjecting an aromatic polycarbonate prepolymer and an aliphatic diol compound to a molecular-weight-increasing linking reaction, whereby it becomes possible to allow an aliphatic diol compound having a relatively low boiling point to contribute to the molecular-weight-increasing linking reaction with high efficiency and it also becomes possible to produce a high-molecular-weight polycarbonate resin having excellent quality in an economically advantageous manner. The method comprises subjecting an aromatic dihydroxy compound and a diester carbonate to a polycondensation reaction to produce an aromatic polycarbonate prepolymer, adding an aliphatic diol compound having an aliphatic group capable of binding to a terminal hydroxy group to the aromatic polycarbonate prepolymer to produce a prepolymer mixture, and subjecting the prepolymer mixture to a molecular-weight-increasing linking reaction under pressure-reduced conditions, wherein the aliphatic diol compound is added under a pressure of higher than 200 torr and subsequently the prepolymer mixture is subjected to the molecular-weight-increasing linking reaction before the concentration of a terminal hydroxy group of the aromatic polycarbonate prepolymer in the prepolymer mixture reaches 2000 ppm.

Inventors:
ISAHAYA YOSHINORI (JP)
HIRASHIMA ATSUSHI (JP)
HARADA HIDEFUMI (JP)
ITO MAKI (JP)
HAYAKAWA JUN-YA (JP)
ISOBE TAKEHIKO (JP)
TOKUTAKE TAICHI (JP)
SHINKAI YOUSUKE (JP)
Application Number:
PCT/JP2013/063345
Publication Date:
November 21, 2013
Filing Date:
May 14, 2013
Export Citation:
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Assignee:
MITSUBISHI GAS CHEMICAL CO (JP)
International Classes:
C08G64/30
Domestic Patent References:
WO2012005251A12012-01-12
WO2011062220A12011-05-26
WO2012108510A12012-08-16
WO2013100072A12013-07-04
WO2011062220A12011-05-26
Foreign References:
JPH02153923A1990-06-13
US5521275A1996-05-28
JPS5019600B11975-07-08
EP0595608A11994-05-04
US5696222A1997-12-09
JP4112979B22008-07-02
JP2008514754A2008-05-08
JP4286914B22009-07-01
JPH0694501B21994-11-24
JP2009102536A2009-05-14
JP3317555B22002-08-26
JPH0726009A1995-01-27
JP2009161745A2009-07-23
JP2010150540A2010-07-08
JP2011006553A2011-01-13
JP2012083924W2012-12-27
Other References:
MAROMOLECULARE CHEMIE, vol. 88, 1965, pages 215 - 231
Attorney, Agent or Firm:
TSUKUNI & ASSOCIATES et al. (JP)
Patent business corporation Tsukuni (JP)
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