Production of ferrite electrostatographic carrier materials havi

Details Production of ferrite electrostatographic carrier materials havi Production of ferrite electrostatographic carrier materials havi

1975-10-29

1978-02-21

Weinblatt, Mayer

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

96 1SD, 252 621P, 252 6256, 252 626, 252 6261, 252 6262, 252 6264, 423633, 427 19, 428900, G03G 914

Patent

active

040753913

ABSTRACT:
A process for preparing humidity-insensitive electrostatographic 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 atmosphere at a temperature of up to about 2500.degree. 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.

REFERENCES:
patent: 3565806 (1971-02-01), Ross
patent: 3839029 (1974-10-01), Berg et al.
patent: 3860524 (1975-01-01), Goldman
patent: 3929657 (1975-12-01), Jones

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