Electrophotographic carrier core magnetite powder
OwnerLars Hultman, Rose-Marie Yttergren +2inventors
InventorsLars Hultman, Rose-Marie Yttergren, Fredrik Eklund, Nils Jonsson
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Abstract
The inventions concerns a new carrier core material consisting of particles of essentially pure, spherical magnetite. These particles are electrically insulated by an inorganic phosphorus containing coating.
Claims13
New carrier core material having a high voltage breakdown value essentially consisting of a magnetite base powder, the particles of which are surrounded ban electrically insulating coating consisting of an inorganic, phosphorus containing material.
A method of preparing a carrier core powder comprising the steps of preparing a coating solution by dissolving phosphorus acid in water, adding the obtained solution to a ferrite base powder while mixing, evaporating the solution and drying the obtained powder containing the insulated powder particles.
Dependencies are inferred from the claim text.