Magneto-optical disk having a microporous protective coating con

Details Magneto-optical disk having a microporous protective coating con Magneto-optical disk having a microporous protective coating con

1995-03-03

1996-11-26

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428212, 4283155, 4283157, 4283211, 428336, 428694BP, 428694TP, 428694ML, 428900, G11B 571, G11B 572

Patent

active

055783554

ABSTRACT:
A magneto-optical disc includes a substrate, a recording layer, and a protective coating comprised of a resin and a lubricant. The disc is operated for magneto-optical recording in a magnetic field modulation mode such that the protective coating is in sliding contact with a magnetic head. The lubricant is a higher fatty acid ester R.sup.1 --COO--R.sup.2 wherein R.sup.1 is a saturated or unsaturated aliphatic C.sub.10 -C.sub.30 hydrocarbon residue, and R.sup.2 is a saturated or unsaturated aliphatic C.sub.10 -C.sub.30 hydrocarbon residue. Alternatively, the protective coating is formed by curing with radiation a composition containing a lubricant and a radiation-curable compound such that micropores are locally formed in or near the outer surface of the protective coating, the lubricant being distributed in the micropores. In either case, the protective coating is effective for minimizing friction with the magnetic head.

REFERENCES:
patent: 4546035 (1985-10-01), Ko et al.
patent: 4693908 (1987-09-01), Rossi et al.
patent: 4759954 (1988-07-01), Kubota et al.
patent: 4913959 (1990-04-01), Miyake et al.
patent: 4985295 (1991-01-01), Ishihara et al.
patent: 5045372 (1991-09-01), Endo et al.
patent: 5112679 (1992-05-01), Nakagama et al.
patent: 5126215 (1992-06-01), Aonuma et al.

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