Magnetic recording medium having cobalt adsorbed iron oxide laye

Details Magnetic recording medium having cobalt adsorbed iron oxide laye Magnetic recording medium having cobalt adsorbed iron oxide laye

1980-11-25

1983-12-13

Robinson, Ellis P.

Stock material or miscellaneous articles

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

Particulate matter

252 6254, 252 6256, 360134, 360135, 360136, 427128, 428692, 428694, 428900, G11B 570, B32B 516

Patent

active

044205376

ABSTRACT:
A magnetic recording medium comprises a substrate coated with a magnetic composition comprising a cobalt adsorbed iron oxide powder with a phosphoric ester type anionic surfactant at a ratio of 2 wt. % or more and a binder at a ratio of said iron oxide powder to said binder of 4 or more.
A magnetic recording medium has a coercive force Hc of 950 to 1200 Oe and a residual magnetic flux .phi..sub.r of 0.35 to 0.6 maxwell.

REFERENCES:
patent: 3586630 (1971-06-01), Irgersoll
patent: 4018968 (1977-04-01), Neumann et al.
patent: 4063000 (1977-12-01), Aonuma et al.
patent: 4197347 (1980-04-01), Ogawa et al.
patent: 4197357 (1980-04-01), Huisman
patent: 4302510 (1981-11-01), Umeki et al.
patent: 4323596 (1982-04-01), Buxbaum et al.
patent: 4352859 (1982-10-01), Yoda

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