Optical element substrate

Details Optical element substrate Optical element substrate

1991-12-23

1993-03-30

Schofer, Joseph L.

Stock material or miscellaneous articles

Composite

Of metal

52631845, 526937, 528481, 5253297, B32B 1508, C08F 2010

Patent

active

051983052

ABSTRACT:
A novel optical element substrate which comprises a random copolymer comprising, in specific weight proportions, a methyl methacrylate unit, an aromatic vinyl compound unit, an unsaturated aliphatic acid unit and a hexagonal acid anhydride unit of the formula ##STR1## The substrate has excellent heat resistance, thermal stability, transparency, resistance to scratching and metal layer corrosion preventive properties and exhibits advantageously low double refraction and warpage. The novel substrate can be advantageously employed as a substrate for an optical element such as an optical disc, e.g. a digital audio disc, a video disc and a disc capable of being directly read after recording, a mirror, a lens and the like.

REFERENCES:
patent: 3137660 (1964-06-01), Jones
patent: 4742123 (1988-05-01), Kopchik
Chemical Abstracts 104:34525f (1986), pp. 13-14.

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