Hematite particles and magnetic recording medium having a non-ma

Details Hematite particles and magnetic recording medium having a non-ma Hematite particles and magnetic recording medium having a non-ma

1996-10-18

1998-05-12

Resan, Stevan A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428329, 428336, 428402, 428403, 428694BA, 428694BS, 428900, 423633, 106304, G11B 5708

Patent

active

057502501

ABSTRACT:
Hematite particles for a non-magnetic undercoat layer for a magnetic recording medium, comprise: high-density acicular hematite particles having an average major axial diameter of not more than 0.3 .mu.m, a major axial diameter distribution in geometrical standard of not more than 1.50 and a BET specific surface area of not less than 35 m.sup.2 /g, showing a pH of not less than 8, and containing not more than 300 ppm of soluble sodium salt, calculated as Na, and not more than 150 ppm of soluble sulfate, calculated as SO.sub.4.

REFERENCES:
patent: 5489466 (1996-02-01), Inaba et al.
patent: 5496622 (1996-03-01), Isobe et al.
patent: 5587232 (1996-12-01), Hayashi et al.
patent: 5604015 (1997-02-01), Hayashi et al.

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