Ferro-magnetic acicular particles for recording medium and proce

Details Ferro-magnetic acicular particles for recording medium and proce Ferro-magnetic acicular particles for recording medium and proce

1977-06-30

1978-10-24

Cooper, Jack

Coating processes

Magnetic base or coating

Magnetic coating

427127, 427215, 428403, 428900, 252 6256, 252 6262, C01G 4908, C04B 3526

Patent

active

041222164

ABSTRACT:
Ferro-magnetic, acicular particles for a recording medium prepared by treating metal hydroxides, the metal component mainly consisting of iron and cobalt, with an oxidative gas in an aqueous alkaline medium wherein magnetic, acicular particles of iron oxide are present and crystallizing metal oxides resulting from the oxidation of the metal hydroxides on the surface of the magnetic, acicular particles of iron oxide.

REFERENCES:
patent: 2906979 (1959-09-01), Bozorth
patent: 3117933 (1964-01-01), Abeck et al.
patent: 3382174 (1968-05-01), Hund
patent: 3573980 (1971-04-01), Haller et al.
patent: 3694261 (1972-09-01), Makino et al.
patent: 3928709 (1975-12-01), Audran et al.

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