Title:
PRODUCTION OF HYDROXYL-TERMINATED AROMATIC POLYCARBONATE RESIN
Document Type and Number:
Japanese Patent JPH06211977
Kind Code:
A
Abstract:
PURPOSE: To obtain an arom. polycarbonate resin having phenolic hydroxyl groups at the molecular terminals by subjecting a dihydric phenol and phosgene to interfacial polymn. and stopping the reaction by adding ammonia in the polymn. step when the attempted mol.wt. is reached.
CONSTITUTION: This poIycarbonate resin is obtd. by subjecting a dihydric phenol and phosgene to interfacial polymn. and stopping the reaction by adding ammonia at the polymn. step when the attempted mol.wt. is reached. Ammonia is added when the viscosity-average mol.wt. of the resulting polycarbonate reaches 5,000-100,000. The amt. of ammonia added is 0.2-50mol, pref. 1-10mol, based on 1mol of remaining chloroformate groups.
Inventors:
TAMURA MITSUHIKO
AKIHARA ISAO
OTA MASARU
SUGIMOTO KENICHI
AKIHARA ISAO
OTA MASARU
SUGIMOTO KENICHI
Application Number:
JP595193A
Publication Date:
August 02, 1994
Filing Date:
January 18, 1993
Export Citation:
Assignee:
MITSUBISHI CHEM IND
International Classes:
C08G64/24; C08G64/22; (IPC1-7): C08G64/24
Attorney, Agent or Firm:
Hasegawa Moji
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