Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1984-09-26

1986-04-29

Robinson, Ellis P.

Stock material or miscellaneous articles

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

Particulate matter

252 6254, 427128, 360134, 360135, 360136, 428405, 428407, 428522, 428694, 428900, G11B 570

Patent

active

045856974

ABSTRACT:
A magnetic recording medium is disclosed comprising a substrate coated with a mixture which consists essentially of (1) hexagonal plate-like shaped, ferrite magnetic powder particles having an average particle diameter of 0.2 .mu.m or less and (2) a binder resin having an active hydrogen equivalent of 2000 or more. This magnetic recording medium displays no flocculation of the hexagonal system ferrite magnetic powder, and has excellent dispersion properties and perpendicular orientation ability. Further, smoothness on the coating film is good, and S/N properties are noticeably improved.

REFERENCES:
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patent: 3833412 (1974-09-01), Akashi
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patent: 4442159 (1984-04-01), Dezawa
patent: 4486496 (1984-12-01), Dezawa
patent: 4521486 (1985-06-01), Ninomiya
O. Kubo, "Properties of Ba Ferrite Particles for Perpendicular Magnetic Recording", IEEE MAG-8, 1122 (1982).
Ucar Solution Vinyl Resins for Coatings--Union Carbide pp. 1-38.
Foreign Search Report.

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