Molding for optical purposes

Details Molding for optical purposes Molding for optical purposes

1990-02-01

1992-07-14

Ziegler, Jacob

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

Synthetic resins

Processes of preparing a desired or intentional composition...

428 64, 524156, 524323, 524348, 524358, 525132, 525390, 525905, 552304, 558 37, 568730, C08K 508, C08K 513, C08K 5357

Patent

active

051303566

ABSTRACT:
A novel, optically transparent, isotropic molding for optical purposes which is free of orientation birefringence consists of a mixture of polyphenylene ethers, vinylaromatic polymers and additives. The novel molding contains traces of novel diphenoquinone and/or diphenohydroquinone derivatives as additives and may also contain novel ammonium salts of sulfuric acid half esters of diphenohydroquinones as further additives. The novel molding has a yellowness index (YI) of from 40 to 90. It can be produced in a simple manner by injection molding processes. The novel molding in the form of a circular disk having a central hole is very useful as a dimensionally stable substrate of audio compact disks (CD), audiovisual compact disks (CDV), laser-optical computer disks and magneto-optical computer disks, and data media of this type which contain these novel dimensionally stable substrates have particularly advantageous performance characteristics.

REFERENCES:
patent: 3383395 (1968-05-01), Schmukler et al.
patent: 4234706 (1980-11-01), White
patent: 4373065 (1983-02-01), Prest, Jr.
patent: 4719170 (1988-01-01), Schrott et al.
Wanzlick, Lehmann-Horchler, Mohrmann, Gritzki, Heidepriem and Pankow, Neuere Methoden der Praparativen Organischen Chemie IV, Synthesen mit naszierenden Chinonen, Angew Chem. 76 (1964), 313-356.

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