Magnetic recording medium having cobalt adsorbed iron oxide laye

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter

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

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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.

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patent: 4352859 (1982-10-01), Yoda

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