Low birefringent polyesters in optical devices

Details Low birefringent polyesters in optical devices Low birefringent polyesters in optical devices

1989-01-23

1990-02-27

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528190, 528205, C08G 6302, C08G 6338

Patent

active

049047558

ABSTRACT:
There are disclosed low birefringent polyesters that are useful in optical devices. The polyesters include units having opposite optical anisotropies. By varying the ratio of the units in the copolymer, the birefringence of an article made from the copolymer can be controlled as desired. The polyester is a substantially optically anisotropic polyester having diol repeating units derived from 9,9-bis(4-hydroxyphenyl)fluorene and at least about 40% by weight of the diacid repeating units derived from aliphatic or cycloaliphatic dicarboxylic acids, the remainder of the diacid repeating units being derived from aromatic dicarboxylic acids.

REFERENCES:
patent: 4247681 (1981-01-01), Mark et al.
patent: 4373065 (1983-02-01), Prest, Jr.
patent: 4387209 (1983-06-01), Rieder et al.

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