Title:
POLYCARBONATE POLYMER
Document Type and Number:
Japanese Patent JPS6383128
Kind Code:
A
Abstract:
PURPOSE: To obtain the title polymer which has a small photoelastic constant and is suited for an optical information recording disc in which laser beams are utilized, by polycondensing 2,2-bis(4-hydroxy-3-isopropylphenyl)propane through a carbonate bond.
CONSTITUTION: An aromatic polycarbonate polymer of formula II is produced either by transesterifying 2,2-bis(4-hydroxy-3-isopropyl)propane of formula I with diphenyl carbonate or by polycondensing it with phosgene. The obtained polycarbonate polymer has a so small photoelastic constant that it can be suitably used for the production of an optical information recording disc which records a signal with laser beams and reads the recorded signal by reflection or transmission of laser beams.
Inventors:
SUGANO TATSUYA
INOTSUKA AKIHIRO
INOTSUKA AKIHIRO
Application Number:
JP23089686A
Publication Date:
April 13, 1988
Filing Date:
September 29, 1986
Export Citation:
Assignee:
DAICEL CHEM
International Classes:
B41M5/26; C08G64/00; C08G64/06; G02B1/04; G11B7/253; (IPC1-7): B41M5/26; C08G63/62; G02B1/04; G11B7/24
Domestic Patent References:
JPS6239624A | 1987-02-20 | |||
JPS55102626A | 1980-08-06 | |||
JPS6343925A | 1988-02-25 | |||
JPS61255929A | 1986-11-13 |
Attorney, Agent or Firm:
Furuya Kaoru