PRODUCTION OF POLYCARBONATE - TEIJIN CHEMICALS LTD

Title:

PRODUCTION OF POLYCARBONATE

Document Type and Number:

Japanese Patent JPH01275630

Kind Code:

A

Abstract:

PURPOSE: To obtain a polycarbonate which is substantially colorless and excellent in hydrolysis resistance without using any heat stabilizer, by using phosgene prepared from carbon monoxide which a total sulfur concentration has decreased to a specified value in the production of a polycarbonate by reacting a dihydric phenol with phosgene.

CONSTITUTION: In the production of a polycarbonate by reacting a dihydric phenol with phosgene in the presence of a solvent, phosgene obtained by reacting carbon monoxide having a total sulfur concentration ≤30ppm. wol. with chlorine is used. Said carbon monoxide can be obtained by, for example, bringing carbon monoxide discharged from a producer into contact with a conversion catalyst to convert the contained sulfur compounds into hydrogen sulfide and further with an aqueous solution of a base such as calcium hydroxide, sodium carbonate or sodium hydroxide to remove hydrogen sulfide from it.

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JPH024825	METHOD OF REGULATING POLYMERIZATION OF CYCLIC POLYCARBONATE
JP3946845	PRODUCTION OF BISPHENOL AND PRODUCTION OF POLYCARBONATE
JPH073002	PRODUCTION OF POLYCARBONATE RESIN

Inventors:

SHIMADA TSUNEO
MORI YOSHIO
YOSHINOUCHI TAKUYA
MITANI MASAHIKO

Application Number:

JP10421788A

Publication Date:

November 06, 1989

Filing Date:

April 28, 1988

Export Citation:

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Assignee:

TEIJIN CHEMICALS LTD

International Classes:

C08G64/20; C08G64/22; (IPC1-7): C08G63/62

Domestic Patent References:

JPS6369520A	1988-03-29
JPS62297320A	1987-12-24

Foreign References:

US3028365A	1962-04-03
US3275601A	1966-09-27

Attorney, Agent or Firm:

Maeda Junhiro

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