Magnetic recording material

Details Magnetic recording material Magnetic recording material

1975-07-31

1977-01-11

Kendall, Ralph S.

Stock material or miscellaneous articles

Metal continuous phase interengaged with nonmetal continuous...

428900, 427132, 252 6254, 252 6256, B23B 1500

Patent

active

040028046

ABSTRACT:
A magnetic recording material which comprises a support having thereon a magnetic recording layer comprising a ferromagnetic substance and a binder, wherein the ferromagnetic substance comprises a mixture of (1) a Berthollide iron oxide having a particle size of about 0.5 .mu. or larger and a degree of oxidation represented by the value of x in FeO.sub.x of 1.33<x.ltoreq.1.45 and (2) a Berthollide iron oxide having a particle size of about 0.4 .mu. or smaller and a degree of oxidation represented by the value of x in FeO.sub.x of 1.43.ltoreq. x< 1.50, in which the weight ratio of Berthollide iron oxide (1) to Berthollide iron oxide (2) ranges from about 1:4 to 4:1.

REFERENCES:
patent: 3031341 (1962-04-01), Eschenfelder
patent: 3337075 (1967-08-01), Stein
patent: 3547693 (1970-12-01), Huguenard
patent: 3653962 (1972-04-01), Akashi et al.
patent: 3740266 (1973-06-01), Akashi et al.
patent: 3821025 (1974-06-01), Akashi et al.
patent: 3824128 (1974-07-01), Akashi et al.
patent: 3833412 (1974-08-01), Akashi et al.

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