Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1982-01-20
1983-09-20
Robinson, Ellis P.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
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
Fuziwara Akio
Nakamura Mitsuyoshi
Otsuka Ichiro
Ozawa Hiroshi
Shin Masaaki
Mitsui Toatsu Chemicals Inc.
Robinson Ellis P.
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