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US 2014/0154623 A1Published application
Carrier core particles for electrophotographic developer, carrier for electrophotographic developer, electrophotographic developer and method for manufacturing the carrier core particles
AssigneesDowa IP Creation Co., Ltd., Dowa Electronics Materials Co., Ltd.
InventorTakeshi KAWAUCHI
Life of this patent
Estimating the term…
Abstract
The carrier core particles for electrophotographic developer include a core composition expressed by a general formula Fe3O4 as a main ingredient and 30 ppm to 400 ppm Na. Such carrier core particles can reduce environmental dependency thereof, while optimizing the resistivity.
Claims8
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A carrier for an electrophotographic developer comprising:
- a carrier core including core composition particles expressed by a general formula Fe3O4 as a main ingredient and additive particles containing 30 ppm to 400 ppm Na;
- and
- a resin coating surfaces of the carrier core particles.
An electrophotographic developer used to develop electrophotography, comprising:
- a carrier that includes a carrier core having core composition particles expressed by a general formula Fe3O4 as a main ingredient and additive particles containing 30 ppm to 400 ppm Na, and a resin coating surfaces of the carrier core particles;
- and
- a toner that can be triboelectrically charged by frictional contact with the carrier for development of electrophotography.
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Dependencies are inferred from the claim text.