Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
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.
Sakamoto Shuji
Shigematsu Kazuyoshi
Shirouzu Shigenori
Suzuki Toshiyasu
Anderson Harold D.
Idemitsu Kosan Co. Ltd.
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