Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1982-07-08

1985-06-04

Robinson, Ellis P.

Stock material or miscellaneous articles

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

Particulate matter

252 6254, 360134, 360135, 360136, 427128, 427131, 4284259, 428694, 428695, 428900, G11B 568

Patent

active

045214867

ABSTRACT:
The magnetic recording medium comprises a non-magnetic substrate and a magnetic layer formed thereon composed mainly of magnetic powder and a binder. The binder contains a binder component having an absorbed amount of the binder component to a surface of the magnetic powder more than 1.5 mg per square meter of a surface area of the powder measured in 3 weight % solution in methyl ethyl ketone solvent, and the magnetic layer has a pigment volume concentration of the magnetic powder between 60 and 75%.
The binder provides an improved strength and high pigment volume concentration of magnetic coating layer, and improved durability of the magnetic recording medium.

REFERENCES:
patent: 4004997 (1977-01-01), Tsukamoto
patent: 4404253 (1983-09-01), Kohler
patent: 4407901 (1983-10-01), Miyatsuka

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