Acicular hematite particles and magnetic recording medium

Details Acicular hematite particles and magnetic recording medium Acicular hematite particles and magnetic recording medium

1999-03-11

2000-11-28

Resan, Stevan A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428329, 428402, 428403, 428694BA, 428694BS, 428900, 106459, 423633, G11B 5733

Patent

active

061532967

ABSTRACT:
Acicular hematite particles of the present invention contain zirconium of 0.05 to 30% by weight (calculated as Zr) based on the total weight of the particles, which is present within the particle, which have an average major axis diameter of not more than 0.3 .mu.m and a pH value of not less than 8, and contain 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.
Such acicular hematite particles are suitable as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium which exhibits a low light transmittance, an excellent smooth surface, a high strength and an excellent durability, and can be prevented from being deteriorated in magnetic properties due to the corrosion of magnetic acicular metal particles containing iron as a main component which are dispersed in a magnetic recording layer thereof.

REFERENCES:
patent: 5750250 (1998-05-01), Hayashi et al.
patent: 5753027 (1998-05-01), Bunt et al.

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