Title:
PRODUCTION OF PURIFIED POLYCARBONATE SOLUTION
Document Type and Number:
Japanese Patent JP3182327
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively remove impurities, esp. impurities contained in supersaturation water, from a crude polycarbonate soln. to thereby obtain a purified polycarbonate soln. improved in quality.
SOLUTION: A purified polycarbonate soln. is produced by washing a crude polycarbonate soln. obtd. by completing interfacial polycondensation. After the crude soln. is washed with water under stirring, the soln. contg. washing water is kept standing or is centrifuged to be separated into a watery phase and an org. phase contg. the polycarbonate. The org. phase is filtered through a filter having a pore size of 20-180μm at a flow rate of 60-1,000mm/min.
Inventors:
Hiroshi Tanaka
Eizo Saitoh
Takanori Hironaka
Eizo Saitoh
Takanori Hironaka
Application Number:
JP28813395A
Publication Date:
July 03, 2001
Filing Date:
October 11, 1995
Export Citation:
Assignee:
Idemitsu Petrochemical Co., Ltd.
International Classes:
C08G64/40; (IPC1-7): C08G64/40
Domestic Patent References:
| JP62169822A |
Attorney, Agent or Firm:
Tokuro Kubota (1 outside)