Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1991-07-02
1994-03-15
Thibodeau, Paul J.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
252 6258, 252 6259, 252 6263, 252 6264, B32B 1502
Patent
active
052944921
ABSTRACT:
Disclosed herein is a process for producing acicular magnetic iron oxide particles comprising the steps of: mixing an aqueous dispersion of acicular magnetic iron oxide particles with an aqueous solution of a Co salt and an alkaline aqueous solution, or an aqueous solution of a Co salt, an aqueous solution of an Fe(II) salt and and an alkaline aqueous solution; and heat-treating the alkaline suspension solution obtained at 50.degree. to 100.degree. C.; wherein an Sr salt, a Ba salt or an Sr salt and a Ba salt is added to one selected from the group consisting of said aqueous dispersion of acicular magnetic iron oxide particles, said aqueous solution of a Co salt, said aqueous solution of an Fe(II) salt, said alkaline aqueous solution and said alkaline suspension solution before heat-treatment, and at least one selected from the group consisting of Si compound, Al compound, Zn compound and Mg compound is added to one selected from the group consisting of said aqueous dispersion of acicular magnetic iron oxide particles, said aqueous solution of a Co salt, said aqueous solution of an Fe(II) salt, said alkaline aqueous solution, said alkaline suspension solution before heat-treatment and said alkaline suspension solution during heat-treatment.
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Fujita Kazuhiro
Kouziro Kazuaki
Moriya Tomohisa
Oka Hiroshi
Shigemura Toshitada
Nakarani D. S.
Thibodeau Paul J.
Toda Kogyo Corp.
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