Production of ferrite electrostatographic carrier materials...

Details Production of ferrite electrostatographic carrier materials... Production of ferrite electrostatographic carrier materials...

G - Physics

03

G

96/215, 96/51

G03G 13/09 (2006.01) G03G 9/107 (2006.01)

Patent

CA 1076406

ABSTRACT OF THE DISCLOSURE A process for preparing humidity-insensitive electro- statographic ferrite carrier materials comprising dry-blending ferrite-forming metal oxides, calcining the blended oxides to provide them with a saturation magnetic moment of about 6 to 30 electromagnetic units per gram, milling the calcined oxides in a slurry to reduce their particle size to about 0.8 to 1.6 microns while adding manganese oxide, copper oxide, and a sodium-free deflocculant to the slurry, pumping the milled slurry to holding/ feeding tanks and adding a binder material to the slurry, spray-drying the slurry to form substantially spherical beads, screening the spray-dried beads, firing the screened beads in an ambient atmosphre at a temperature of up to about 2500°F. for up to about 8 hours, deagglomerating the fired beads, and screening the beads to obtain ferrite carrier particles having controlled surface species and physical properties.

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