Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1988-09-21

1991-05-07

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428329, 428694, 428695, 428900, G11B 2300

Patent

active

050136020

ABSTRACT:
A magnetic recording medium is described, comprising a nonmagnetic support having thereon a single magnetic layer or plural magnetic layers containing ferromagnetic particles dispersed in a binder, wherein said ferromagnetic particles are ferromagnetic particles of the magnetic iron oxide type having an adsorption amount of stearic acid of from 3.times.10.sup.-6 to 6.times.10.sup.-6 mol/m.sup.2 per a surface area thereof; said binder contains at least one polymer having at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --OPO(OM').sub.2, --COOM and --PO(OM').sub.2, in which M represents Na, Li, K, a hydrogen atom, NR.sub.4 or NHR.sub.3, M' represents Na, Li, K, a hydrogen atom, NR.sub.4, NHR.sub.3 or an alkyl group, and R.sub.3 and R.sub.4 represent a lower alkyl group; and said magnetic layer further contains at least one fatty acid.

REFERENCES:
patent: 4562117 (1985-12-01), Kikukawa et al.
patent: 4784907 (1988-11-01), Matsufuji et al.
patent: 4806417 (1989-02-01), Saito et al.
patent: 4847156 (1989-07-01), Nishikawa et al.
patent: 4860046 (1989-09-01), Moriizumi et al.
Kouichi Masaki, "Surface Modifications of Ferromagnetic Iron Oxide for Magnetic Recording," Scientific Publication of the Fuji Photo Film Co., Ltd., No. 33,20 (and English translation), published Oct. 13, 1987.

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