Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1992-05-19
1995-05-23
Nakarani, D. S.
Stock material or miscellaneous articles
Composite
Of inorganic material
428695, 428900, G11B 566, G11B 570, G11B 572
Patent
active
054180775
ABSTRACT:
A magnetic recording medium comprises a non-magnetic base material; a lower magnetic layer containing a magnetic powder for recording in a long wavelength range and a resin binder; an upper magnetic layer containing a magnetic powder for recording in a short wavelength range and a resin binder; and an intermediate layer disposed between the two magnetic layers. By properly selecting the type and amount of resin binder contained in the upper magnetic layer and by disposing the intermediate layer whose main component is a resin binder, dispersion property of the magnetic powder in the upper magnetic layer can highly be improved, and thin and smooth magnetic layers can be obtained. Thus, the recording medium provides excellent reproduction characteristics in the wide wavelength range and has excellent running durability. In particular, the reproduction characteristics in a short wavelength range can be improved. A hexagonal ferrite powder is suitably used as the magnetic powder for recording in the short wavelength range. As the resin binder for the intermediate layer, a polyisocyanate compound whose molecular weight is 1,000 or less is particularly effective.
REFERENCES:
patent: 5032428 (1991-07-01), Ogawa et al.
patent: 5077131 (1991-12-01), Nakano
patent: 5098773 (1992-03-01), Saito et al.
patent: 5114778 (1992-05-01), Yanai et al.
patent: 5149585 (1992-09-01), Goto et al.
patent: 5158822 (1992-10-01), Saito et al.
Patent Abstrcts of Japan, vol. 14, No. 581 (P-1147) Dec. 26, 1990, & JP-A-2 249 129 (Konica Corporation), Oct. 4, 1990.
Patent Abstracts of Japan, vol. 13, No. 279 (P-891) Jun. 17, 1989, & JP-A-1 066 818 (Matsushita Electric Ind. Co.), Mar. 13, 1989.
Fukaya Toshio
Furuhata Ken-ichi
Oguchi Toshihiko
Takeuchi Hajime
Tobisawa Seiichi
Kabushiki Kaisha Toshiba
Konica Corporation
Le H. Thi
Nakarani D. S.
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