Process for producing plate-like magnetite particles and plate-l

Details Process for producing plate-like magnetite particles and plate-l Process for producing plate-like magnetite particles and plate-l

1988-02-16

1989-09-12

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423632, C01G 4906, C01G 4908

Patent

active

048658340

ABSTRACT:
Plate-like magnetite particles, plate-like maghemite particles and the processes for producing these particles are herein disclosed. The plate-like magnetite particles and the plate-like maghemite particles provided according to the present invention are fine plate-like particles which are poreless and non-sintered as the plate-like magnetite particles are produced directly from an aqueous solution and these plate-like magnetite particles are oxidized by heating to produce the plate-like maghemite particles. Therefore, these particles can be filled to a high density in a vehicle or resin, have good dispersibility and orientability and are also high in a degree of particle contact, so that they are suited for use as electromagnetic wave absorbing and shielding material, magnetic material for magnetic recording, black or brown pigment for paints and colorant for rubber and plastic products.

REFERENCES:
patent: 4136158 (1979-01-01), Okuda et al.
patent: 4202871 (1980-05-01), Matsumoto et al.
patent: 4382822 (1983-05-01), Mayer
patent: 4497723 (1985-02-01), Ohlinger et al.
patent: 4597958 (1986-07-01), Takagi et al.
Patent Abstracts of Japan, vol. 11, No. 132 (C-417) (2579) Apr. 24, 1987.

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