Optical element substrate

Details Optical element substrate Optical element substrate

C - Chemistry, Metallurgy

08

F

402/403, 402/415

C08F 220/18 (2006.01) C08F 8/48 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1324699

ABSTRACT OF THE DISCLOSURE A novel optical element substrate which comprises a random copolymer comprising, in specific weight propor- tions, a methyl methacrylate unit, an aromatic vinyl compound unit, an unsaturated aliphatic acid unit and a hexagonal acid anhydride unit of the formula Image The substrate has excellent heat resistance, thermal stability, transparency, resistance to scratching and metal layer corrosion preventive properties and exhibits advan- tageously 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.

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