Magnetic particle dispersions

Details Magnetic particle dispersions Magnetic particle dispersions

1980-03-10

1981-07-28

Edmundson, F. C.

Compositions

Magnetic

Chromium or chromium compound containing

252 6253, 252313S, B01J 1300

Patent

active

042809185

ABSTRACT:
A magnetic dispersion is prepared by adjusting the pH of a mixture containing magnetic particles to a value which results in a positive electrostatic charge on the particles, while a mixture containing colloidal silica particles at the same pH results in negative electrostatic charges on the silica particles. Combining these mixtures causes the silica particles to coat and irreversibly bond to the magnetic particles resulting in better dispersion and less aggregation of the magnetic particles.

REFERENCES:
patent: 2085129 (1937-06-01), Stoewener
patent: 2731326 (1956-01-01), Alexander et al.
patent: 2733160 (1956-01-01), Iler
patent: 2885366 (1959-05-01), Iler
patent: 3042616 (1962-07-01), Brown

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