Method of making magnetically attractable particles

Details Method of making magnetically attractable particles Method of making magnetically attractable particles

1989-11-22

1991-08-13

Lovering, Richard D.

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

106457, 106459, 252 6256, 252 6261, 252309, 427127, 42840224, 435176, 501 12, B01J 1302, C04B 3526, C04B 3564, H01F 136

Patent

active

050395599

ABSTRACT:
Magnetically attractable particles comprise a core of magnetic material encapsulated in a metal oxide coating. They may be made by emulsifying an aqueous solution or dispersion of the magnetic material or precursor, and an aqueous solution or sol of a coating inorganic oxide or precursor, in an inert water-immiscible liquid. The aqueous droplets are gelled, e,g. by ammonia or an amine., recoverd, and heated at 250.degree.-2000.degree. C. The resulting particles are generally smooth spheres below 100 microns in diameter and often of sub-micron size.

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patent: 4461832 (1984-07-01), Tschang et al.
patent: 4882224 (1989-11-01), Moro et al.

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