Magnetic particles for magnetic recording medium and process for

Details Magnetic particles for magnetic recording medium and process for Magnetic particles for magnetic recording medium and process for

1993-11-10

1996-01-16

Bonner, C. Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6259, 428404, C04B 3526, B32B 1800

Patent

active

054845459

ABSTRACT:
Disclosed herein magnetic particles for magnetic recording which comprise acicular or plate-like magnetic particles and not less than 0.01 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2 and based on the acicular or plate-like magnetic particles) of an oxide or hydroxide containing Al, Si or both Al and Si and adhered to the surfaces of the acicular or plate-like magnetic particles, and which have not less than 0.50 of a molecular-weight-dependent parameter .alpha. represented by the following formula (I):

REFERENCES:
patent: 4956220 (1990-09-01), Sueyoshi et al.
patent: 5102732 (1992-04-01), Goto et al.
patent: 5124207 (1992-06-01), Hayashi et al.
patent: 5356712 (1994-10-01), Hashiuchi et al.
Patent Abstracts of Japan, vol. 7, No. 148 (E-184) 29 Jun. 1983 & JP-A-58 060 506 (Ishihara Sangyo KK) 11 Apr. 1983. Abstract.

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