Magnetic recording medium containing ferro magnetic powder, pola

Details Magnetic recording medium containing ferro magnetic powder, pola Magnetic recording medium containing ferro magnetic powder, pola

1988-05-06

1992-06-30

Thibodeau, Paul J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

428694, 428900, 4284259, G11B 2300

Patent

active

051262029

ABSTRACT:
A magnetic recording medium comprising a nonmagnetic support having provided thereon a magnetic layer comprising a ferromagnetic powder dispersed in a binder, wherein said ferromagnetic powder has a specific surface area of 40 m.sup.2 /g or more as measured by the BET method; said magnetic layer further comprises carbon black having an average particle diameter of from about 20 to 120 m.mu.; and said binder comprises the combination of (1) a vinyl chloride resin containing a phosphate ester group represented by ##STR1## wherein M.sub.1 and M.sub.2, which may be the same or different, each represents Na, K, Li, H, N.sym.R.sub.3, or N.sym.HR.sub.2 wherein R represents an alkyl group or a hydrogen atom, and (2) at least one resin other than said vinyl chloride resin containing at least one of --SO.sub.3 M, --OSO.sub.2 M, --COOM, and ##STR2## wherein M, M.sub.1, and M.sub.2, which may be the same or different, each represents Na, K, Li, H, N.sup.4 .sym. R.sub.3, or N.sup..sym. HR.sub.2 wherein R represents an alkyl group or a hydrogen atom; provided that the weight ratio of said resin other than said vinyl chloride resin to said vinyl chloride resin is from about 0.4 to 2.5.

REFERENCES:
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patent: 4546038 (1985-10-01), Yamaguchi et al.
patent: 4613545 (1986-09-01), Chubachi
patent: 4716077 (1987-12-01), Okita et al.
patent: 4784914 (1988-11-01), Matsufuji et al.
patent: 4830923 (1989-05-01), Sumiya et al.
patent: 4847156 (1989-07-01), Nishikawa et al.
patent: 5034271 (1991-07-01), Miyoshi et al.

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