One-component type developer containing iron oxide, carbon...

G - Physics – 03 – G

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G03G 9/087 (2006.01) G03G 9/083 (2006.01)

Patent

CA 1122461

Abstract of the Disclosure In a one-component type developer for electro- photography consisting essentially of a dry blend of fixing magneto-sensitive particles and flowability- and electric resistance-controlling fine particles, when an aromatic vinyl resin and/or an acrylic resin is used an a binder resin for the magneto-sensitive particles in combination with a low molecular weight olefin resin, the magneto-sensitive particles are much improved in the property of holding the flowability- and electric resistance-controlling fine particles on the surfaces thereof. Accordingly, these fine particles cannot be substantially separated from the magneto-sensitive particles under agitation conditions, development condi- tions and fixing conditions. As a result, contamination of the interior of a copying machine, especially an optical system, can be completely prevented, and also - 1 - contamination of the background can be completely prevented. Further, the resulting fixed images have a very high resistance to friction and abrasion, and troubles such as blurring and flow of the image are not caused at all.

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