Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1987-04-22

1988-07-12

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

252 6254, 427128, 428328, 428694, 428900, G11B 5708

Patent

active

047569620

ABSTRACT:
A magnetic recording medium, comprising a plastic base coated with a magnetic layer of a ferromagnetic powder dispersed in a resin binder, contains in the magnetic layer .alpha.-Al.sub.2 O.sub.3 particles with an average particle size of 0.1 to 0.3 .mu.m as determined by electron microscopy in an amount of more than 0.5% but less than 15% by weight on the basis of the ferromagnetic powder weight. The .alpha.-Al.sub.2 O.sub.3 particles have an .alpha.-transformation rate of at least 50%. The powder is produced by an organic alumina process.

REFERENCES:
patent: 4109408 (1978-08-01), Dessauer
patent: 4238341 (1980-12-01), Kato
patent: 4460651 (1984-07-01), Hosuka
patent: 4590127 (1986-05-01), Hashimoto
patent: 4618536 (1986-10-01), Morioka
patent: 4652500 (1987-03-01), Ejiri
patent: 4670337 (1987-06-01), Tokuoka
patent: 4671993 (1987-06-01), Kadokura

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