Optical disk substrate comprising aromatic polycarbonate

Details Optical disk substrate comprising aromatic polycarbonate Optical disk substrate comprising aromatic polycarbonate

1988-10-12

1990-05-08

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528204, C08G 6362

Patent

active

049239627

ABSTRACT:
A resin material for optical instruments comprising a polycarbonate having the repeating units represented by the following general formula: ##STR1## wherein X represents ##STR2## has an extremely small birefringence particularly to oblique-incident lights.

REFERENCES:
patent: 3422065 (1969-01-01), Wolff et al.
patent: 4465721 (1984-08-01), McAlister
patent: 4680374 (1987-07-01), Hasuo et al.
patent: 4734488 (1988-03-01), Hasuo et al.

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