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Title:
PROCESS FOR THE PREPARATION OF AROMATIC POLYCARBONATE
Document Type and Number:
WIPO Patent Application WO/1998/054240
Kind Code:
A1
Abstract:
A process for the preparation of an aromatic polycarbonate by transesterification of a diaryl carbonate with an aromatic dihydroxy compound, characterized in that the diaryl carbonate is one which is prepared by decarbonylation of a diaryl oxalate represented by general formula (1): (wherein the two Ar's are each independently a C�6?-C�14? aromatic hydrocarbon group) and has a hydrolyzable halogen content of 5ppm or below. The use of a diaryl carbonate which is prepared by decarbonylation of a diaryl oxalate and has a hydrolyzable halogen content lowered to at least a specific level makes it possible to prepare readily an aromatic polycarbonate having a high molecular weight and an excellent hue without detriment to the reactivity of transesterification in preparing the aromatic polycarbonate.

Inventors:
TAKEMOTO HIDEMI (JP)
SAWAKI TORU (JP)
SASAKI KATSUSHI (JP)
Application Number:
PCT/JP1998/002276
Publication Date:
December 03, 1998
Filing Date:
May 25, 1998
Export Citation:
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Assignee:
TEIJIN LTD (JP)
TAKEMOTO HIDEMI (JP)
SAWAKI TORU (JP)
SASAKI KATSUSHI (JP)
International Classes:
C07C68/00; C08G64/30; (IPC1-7): C08G64/30; C07C69/96
Foreign References:
JPH08333307A1996-12-17
JPH02175722A1990-07-09
Other References:
See also references of EP 0987285A4
Attorney, Agent or Firm:
Ohshima, Masataka (Fukuya Building 3, Yotsuya 4-chom, Shinjuku-ku Tokyo, JP)
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