Sharp Kabushiki Kaisha Corporation

Toshiharu Kataoka

Masahiro Sakai

Yasuo Imura

Toner for electrostatic development in accordance with one aspect of the present invention contains toner base particles produced by subjecting a toner composition containing binder resin, a coloring agent, and wax to melting and kneading and thereafter pulverization and classification, the toner having a volume median particle diameter (D50) of 5.5 to 7.5 &#x3bc;m, and the toner having particle size distribution in which the toner base particles include 15 to 55% by number of toner base particles of not more than 5 &#x3bc;m in particle diameter, and include not more than 1.5% by number of toner particles of more than 10 &#x3bc;m in particle diameter.

Toner for electrostatic development, image forming device using same, and image forming method

A two-component developer is provided in which the reduction of the hot offset occurrence temperature due to detachment of the coating layer, image density insufficiency, image fogging and toner scattering and the like can be suppressed. In the two-component developer including a toner and a carrier, the content of acrylic resin in a coating layer of the carrier is in a range from 5 to 50% by weight based on the total amount of the coating layer, and the dielectric loss (tan &#x3b4;) is in the range from 4.0&#xd7;10to 15.0&#xd7;10. By using the two-component developer, the reduction of the hot offset occurrence temperature in a fixing apparatus can be prevented. Further, image density insufficiency, image fogging and toner scattering and the like can be suppressed, with a result that images having high quality and sufficient image density can be obtained.

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Osaka, Japan

Toshiharu Kataoka