Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1976-09-10
1981-05-12
Smith, John D.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
252 6255, 252 6256, 428403, 428404, 428406, 428407, 430108, 430111, 430122, G03G 910
Patent
active
042672473
ABSTRACT:
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 particles are prpepared by the thermal decomposition of transition metal carbonyls in the presence of the silicaceous particles with a suitable suspending medium. Air and moisture are excluded from the reaction vessel and the contents are heated with agitation so that the carbonyl boils and the mixture is refluxed 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 significantly reduced toner impaction levels.
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patent: 3947370 (1976-03-01), Miller
Lewis Richard B.
Ziolo Ronald F.
Smith John D.
Xerox Corporation
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