Magnetic disc having a magnetic layer with a glass transition te

Details Magnetic disc having a magnetic layer with a glass transition te Magnetic disc having a magnetic layer with a glass transition te

1990-11-07

1993-01-12

Thibodeau, Paul J.

Textiles: manufacturing

Warp preparing or handling

Machine replenishing

428 65, 428336, 428403, 4284246, 4284251, 4284259, 428522, 428694, 428900, G11B 500

Patent

active

051789256

ABSTRACT:
A magnetic disc having excellent running durability is disclosed, which comprises a non-magnetic support and a magnetic layer on the non-magnetic support, the layer being composed mainly of a ferromagnetic metal powder and a binder resin, wherein the ferromagnetic metal powder has a pH value of less than 7.0 and a specific surface area as determined by the BET method of at least 40 m.sup.2 /g, and the glass transition temperature of the magnetic layer is at least 75.degree. C.

REFERENCES:
patent: 4968557 (1990-11-01), Ejiri et al.
patent: 4985314 (1991-01-01), Merriam et al.

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