Magnetic recording medium in the form of a floppy disc having a

Details Magnetic recording medium in the form of a floppy disc having a Magnetic recording medium in the form of a floppy disc having a

1990-11-29

1994-04-05

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428328, 428402, 428409, 4284246, 428522, 428694BG, 428694BR, 428694BA, 428900, G11B 500

Patent

active

053003438

ABSTRACT:
A novel magnetic disc and process for the preparation thereof is disclosed, comprising a nonmagnetic support having thereon a magnetic layer comprising ferromagnetic metal particles and a binder resin containing at least a vinyl chloride copolymer, wherein the crystallite size of the ferromagnetic metal particles as determined by X-ray diffraction method is 300 .ANG. or less, and the ratio .alpha. at the surface of the magnetic layer of the integrated intensity of the Cl-2P spectrum as determined by X-ray photoelectron spectroscopy to that of the Fe-2P(3/2) spectrum is in the range of from 0.50 to 0.90. In a preferred embodiment, the vinyl chloride copolymer contains at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --PO.sub.3 M.sub.2, and --CO.sub.2 M wherein M represents hydrogen, an alkali metal or ammonium and at least one epoxy ring in the copolymer molecule.

REFERENCES:
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patent: 4791021 (1988-12-01), Honda et al.
patent: 4851288 (1989-07-01), Ishikuro et al.
patent: 4863793 (1989-09-01), Ogawa et al.
patent: 4888212 (1989-12-01), Iida et al.
patent: 4904530 (1990-02-01), Huizing et al.
patent: 4959263 (1990-09-01), Aonuma et al.
patent: 5093191 (1992-03-01), Sano et al.
patent: 5096774 (1992-03-01), Sano et al.

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