POLYCARBONATE AND PRODUCTION THEREOF

Title:

POLYCARBONATE AND PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/1993/015129

Kind Code:

A1

Abstract:

A polycarbonate which does not undergo coloration or is substantially free from chloride ions causative of coloration, which has a branching parameter (G) of 0.1 to 1.0 and a hydroxyl terminal content of 20 mole % or less based on the total terminal content and/or a chloride ion concentration of 10 ppm or less and/or a sum of the alkali metal ion concentration and the alkaline earth metal ion concentration of 1 ppm or less. A process for producing the polycarbonate by melt transesterification, which comprises using as the transesterification catalyst (a) a basic nitrogen compound and/or (b) a compound containing an element selected from the group consisting of those of groups IIb, IVb and Vb of the periodic table, or a combination of (a) a basic nitrogen compound with (b) a compound containing an element selected from the group consisting of alkali and alkaline earth metals.

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Inventors:

OKANO YOSHIMICHI (JP)
KANNO TATSUYA (JP)
YAMATO TSUTOMU (JP)
OSHINO YASUHIRO (JP)
TANIGAWA MICHIYO (JP)
KUWANA TAKAAKI (JP)
FUKUDA YUTAKA (JP)

Application Number:

PCT/JP1993/000104

Publication Date:

August 05, 1993

Filing Date:

January 28, 1993

Export Citation:

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Assignee:

DAICEL CHEM (JP)

International Classes:

C08G64/14; C08G64/30; (IPC1-7): C08G64/14; C08G64/30; C08K5/06; C08K5/13; C08L69/00

Foreign References:

JPH03255125A	1991-11-14
JPH0326722A	1991-02-05
JPH02212518A	1990-08-23
JPS4620503B1
JPH03149221A	1991-06-25
JPS4717978B1
JPS4427984B1
JPH0446928A	1992-02-17
JPH0489824A	1992-03-24

Other References: