Low specific gravity magnetic carrier materials

Details Low specific gravity magnetic carrier materials Low specific gravity magnetic carrier materials

G - Physics

03

G

96/51

G03G 9/10 (2006.01)

Patent

CA 1114220

LOW SPECIFIC GRAVITY MAGNETIC CARRIER MATERIALS ABSTRACT OF THE DISCLOSURE Electrostatographic carrier materials having low bulk densities and high magnetic permeabilities are obtained by impregnating low density porous silicaceous particles with a magnetic or magnetically-attractable transition metal or metal oxide thereof. The low density magnetic composite carrier par- ticles are prepared by the thermal decomposition of transistion metal carbonyls in the presence of the silicaceous particles with a suitable suspending medium. The contents are heated with agitation so that carbonyl boils and the mixture is refluxed, in the absence of air and moisture, until the temperature rises to that of the suspending medium whereupon impregnation of the silicaceous particles with elemental metal and/or metal oxide is complete. The mixture is cooled, the beads washed, air-dried, and recovered. When mixed with toner particles the aforementioned carrier materials experience sig- nificantly reduced toner impaction levels.

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