Process for protecting magnetic particles with chromium oxide

Details Process for protecting magnetic particles with chromium oxide Process for protecting magnetic particles with chromium oxide

1980-12-02

1983-05-10

Morgenstern, Norman

Coating processes

Magnetic base or coating

Magnetic coating

210509, 210695, 210924, 427131, 427214, 427216, 427217, 427243, 427247, 427352, B05D 512, B05D 700

Patent

active

043829821

ABSTRACT:
A method for the preparation of magnetic particulate matter coated with a protective layer of chromium(III) hydroxide, oxyhydroxide or oxide, optionally crosslinked with polyacrylic acid, which process comprises a first step of depositing a hydrogel of chromium(III) hydroxide onto magnetic material in a desired particulate form, a second step of heating to form chromium(III) hydroxide, oxyhydroxide or oxide, and a third optional step, which may precede or follow the said second step, of crosslinking with polyacrylic acid. The coated protected magnetic particles are useful for the preparation of composite magnetic polymeric particles for use in processes involving ion exchange, filtration and adsorption.

REFERENCES:
patent: 3778373 (1973-12-01), Robbins
patent: 3932293 (1976-01-01), Roden
patent: 4064292 (1977-12-01), Schoenafinger et al.
patent: 4211664 (1980-07-01), Dixon et al.
patent: 4255492 (1981-03-01), Audran et al.

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