Invention Grant
- Patent Title: Toner for developing latent electrostatic image, two-component developer, image forming method and image forming apparatus
- Patent Title (中): 用于显影静电潜像的调色剂,双组分显影剂,成像方法和成像设备
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Application No.: US12049686Application Date: 2008-03-17
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Publication No.: US08771914B2Publication Date: 2014-07-08
- Inventor: Akihiro Kotsugai , Hiroshi Yamashita
- Applicant: Akihiro Kotsugai , Hiroshi Yamashita
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2007-077503 20070323; JP2008-004818 20080111
- Main IPC: G03G15/01
- IPC: G03G15/01

Abstract:
The present invention provides a toner which, despite its spherical shape, makes it possible to prevent an external additive from being embedded in the toner easily or by a load generating low stress, reduce variation in image density, maintain cleaning ability and transfer ability throughout its long-term use and obtain excellent image quality, and further, provides a two-component developer, an image forming method and an image forming apparatus with the use of the toner. There is a toner including: base particles including a colorant and a resin, and hard fine particles, wherein the base particles and the hard fine particles are mixed together, and protruding portions formed of fine organic resin particles which are different in composition from a resin contained as a main component in the base particles are provided on surfaces of the base particles.
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