Title:
ポリカーボネートの製造法
Document Type and Number:
Japanese Patent JP4284635
Kind Code:
B2
Abstract:
A process for preparing polycarbonate is composed of the steps of transesterifying a dialkyl oxalate and a phenolic compound to give a diaryl oxalate; decarbonylating the diaryl oxalate to give a diaryl carbonate; reacting the diaryl carbonate with a polyvalent hydroxyl compound in the presence of a catalyst containing an amine compound or an ammonium compound to give the polycarbonate, removing a phenolic by-product/amine by-product mixture; collecting the mixture; purifying the mixture so that the amount of the amine by-product in the mixture is reduced to give a phenolic by-product mixture not containing the amine by-product in an amount of more than 600 ppm; and, utilizing thus purified phenolic mixture as a whole or a part of the phenolic compound in the first step.
Inventors:
Keigo Nishihira
Shuji Tanaka
Shinichi Yoshida
Shuji Tanaka
Shinichi Yoshida
Application Number:
JP2000602698A
Publication Date:
June 24, 2009
Filing Date:
March 03, 2000
Export Citation:
Assignee:
Ube Industries,Ltd.
International Classes:
C08G64/20; C07C68/00; C08G64/30
Domestic Patent References:
| JP10152552A | ||||
| JP10059905A |
Attorney, Agent or Firm:
Yanagawa Yasuo