Optical recording medium

Details Optical recording medium Optical recording medium

1987-12-16

1989-07-18

Lesmes, George F.

Stock material or miscellaneous articles

Composite

Of inorganic material

428469, 428472, 428698, 428699, 428702, 428704, 428900, G11B 724

Patent

active

048493040

ABSTRACT:
An optical recording medium comprising a recording layer on a substrate and a protective layer formed adjacent to the upper and/or lower surface of the recording layer is more durable and corrosion resistant when the protective layer has a composition comprising, in % by weight, 40-60% of SiO.sub.2, 0.5-10% of an alkali metal oxide, 10-59.5% of Al.sub.2 O.sub.3 and/or B.sub.2 O.sub.3, and optionally up to 50% of a divalent metal oxide.

REFERENCES:
patent: 4645722 (1987-02-01), Katagawa et al.
patent: 4658388 (1987-04-01), Ishiwatari et al.
patent: 4661420 (1987-04-01), Nakamura et al.
patent: 4680742 (1987-07-01), Yamada et al.
patent: 4743502 (1988-05-01), Yoshitoni

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