Production of low density coated magnetic polymer carrier partic

Details Production of low density coated magnetic polymer carrier partic Production of low density coated magnetic polymer carrier partic

1979-12-26

1981-01-13

Welsh, John D.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Process of making developer composition

430108, 427222, 427229, G03G 914, B05D 700

Patent

active

042450268

ABSTRACT:
Electrostatographic carrier materials having low bulk densities and high magnetic permeabilities are obtained by impregnating low density imbibitive polymer particles with magnetic or magnetically attractable metal or metal oxide. The low density magnetic composite carrier particles are prepared by the solution phase thermal decomposition of transition metal carbonyls in the presence of the polymer particles with a suitable suspending medium. Air and moisture are excluded from the reaction vessel and the contents are heated with stirring so that the carbonyl boils and the mixture is refluxed until the temperature rises to that of the suspending medium whereupon the polymer particles are impregnated within their pores with elemental metal. The mixture is cooled, the beads washed, air dried, and recovered. When mixed with toner particles and employed in electrostatographic development of electrostatic latent images, the aforementioned carrier materials provide significantly reduced toner impaction levels and longer useful life.

REFERENCES:
patent: 3342587 (1957-09-01), Goodrich et al.
patent: 3535149 (1970-10-01), Dunn et al.
patent: 3900646 (1975-08-01), Clyde

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