Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1980-11-20
1982-08-31
Cooper, Jack
Stock material or miscellaneous articles
Composite
Of inorganic material
75 05AA, 148 315, 148 3155, 148105, 252 6255, 252 6259, 427132, 428900, G11B 562
Patent
active
043472915
ABSTRACT:
A magnetic recording medium is produced by forming an alkaline aqueous slurry of an acicular hydrated iron oxide or an acicular iron oxide as a starting material; adding a water soluble silicate to said slurry; treating it by a hydrothermal reaction in a closed reactor as an autoclave at elevated temperature and pressure; dehydrating and drying said slurry to obtain a dry iron oxide containing SiO.sub.2 component; converting it into a magnetic metallic iron powder by a reduction in a reducing atmosphere as hydrogen atmosphere; and coating a magnetic composition obtained by mixing said magnetic metallic iron powder with a binder.
A magnetic recording tape comprises metallic iron powder having a coercive force of 1000 Oe or more and a residual magnetic flux density of 2000 gauss or more and an orientation degree as a ratio of squareness ratio in longitudinal direction to squareness ratio in transversal direction: ##EQU1##
REFERENCES:
patent: 3947502 (1976-03-01), Leitner et al.
patent: 4043846 (1977-08-01), Amemiya et al.
patent: 4133677 (1979-01-01), Matsui et al.
patent: 4169912 (1979-10-01), Schonafinger et al.
patent: 4178171 (1979-12-01), Steck et al.
patent: 4256484 (1981-03-01), Rodrian
Cooper Jack
TDK Electronics Co. Ltd.
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