Optical information recording disk

Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier

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346 76L, 346 77E, 3461351, 346137, 369275, 369276, 369286, 369288, 428 64, 428522, 428523, B32B 302

Patent

active

044056710

ABSTRACT:
Disclosed herein is an optical information recording disk comprising as a base material thereof a polymer or copolymer having a glass transition temperature of at least 50.degree. C. and a structural unit derived from a monomer which is an ester of an .alpha.,.beta.-unsaturated carboxylic acid and an alicyclic alcohol represented by the general formula: ##STR1## wherein n is an integer of 1-5, R denotes a hydrogen or an alkyl or alkenyl group, and, when n stands for an integer of 2-5, the Rs may be the same or different.
The above disk does not develop deformation such as warping or twisting by changes in humidity and is uniform optically.

REFERENCES:
patent: 4125654 (1978-11-01), Kaneko
patent: 4304806 (1981-12-01), Anderson

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