Title: Magnetic recording medium

Abstract: A magnetic recording medium for high density recording comprising a support having thereon a magnetic recording layer comprising a ferromagnetic metal powder of the Fe-Co-Cr-B system and having a coercive force of about 700 to 500 oersteds in the oriented direction of the magnetic substance and a residual magnetic flux density of about 1500 gausses or more, the residual magnetic flux density of which after storage for 160 hours under the conditions of a temperature of 60.degree.C and 90%RH is 85% or more of the initial value thereof before storage under these conditions in a binder. The magnetic recording medium is especially suitable for high density recording, having sufficient sensitivity and excellent resistance.

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Inventors: Tamai, Yasuo (Odawara, JA)
Aonuma, Masashi (Odawara, JA)
Nakamura, Matsuaki (Odawara, JA)
Agawa, Hiroshi (Odawara, JA)
Akashi, Goro (Odawara, JA)

Application Number: 498337
Filing Date: 1974-08-19
Publication_date: 1976-03-09
Assignee: Fuji Photo Film Co., Ltd. (Minami-ashigara, JA)
Primary Class(es): 148/105 75/349, 148/108, 427/132, 428/432
Other Classes:
US Patent Ref:

3206338	Sep, 1965	Miller et al.	148/105.
3535104	Oct, 1970	Little et al.	148/105.
3567525	Mar, 1971	Graham et al.	75/.
3661556	Mar, 1972	Jolley et al.	75/.
3821025	Jun, 1974	Akashi et al.	117/235.

Other Refs:
Primary Examiner: Satterfield, Walter R.
Assistant Examiner:
Attorney: Sughrue, Rothwell, Mion, Zinn & Macpeak