Dowa Electronics Materials Co., Ltd.

Dowa IP Creation Co., Ltd.

Haruka Seki

Shinya Sasaki

Takeshi Kawauchi

Sho Ogawa

Yohei Ishikawa

Ferrite particles have, as a main component, a material represented by a composition formula MFeO(where M is at least one type of metal selected from a group made of Mg, Mn, Ca, Ti, Cu, Zn, Sr and Ni, 0&#x3c;x&#x3c;1), where the maximum height Rz of the particles falls within a range of 1.40 &#x3bc;m to 1.90 &#x3bc;m, and the degree of distortion Rsk of the particles falls within a range of &#x2212;0.25 to &#x2212;0.07. In this way, when the ferrite particles are used as the carrier of an electrophotographic image forming apparatus, even if an image formation speed is increased, the occurrence of a failure is reduced for a long period of time.

Ferrite particles, carrier for electrophotographic development using same, and developer for electrophotography

Provided is a method for manufacturing carrier core particles for electrophotographic developer capable of stably maintaining high chargeability over a long time. The method for manufacturing carrier core particles includes a granulation step of granulating a mixture of raw materials containing manganese, iron, strontium, and calcium and a firing step of firing the mixture granulated in the granulation step. The firing step includes a heating process of heating the granular mixture with an increase in temperature to a predetermined degree and a cooling process of cooling the granular mixture, after the heating process, in an atmosphere with an oxygen concentration ranging from 5000 ppm to 20000 ppm. The molar ratio of the sum of strontium and calcium to the sum of the manganese, iron, strontium, and calcium is 0.0026 to 0.013.

Method for manufacturing carrier core particles for electrophotographic developer, carrier core particles for electrophotographic developer, carrier for electrophotographic developer, and electrophotographic developer

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Okayama, Japan

Haruka Seki