Invention Grant
US08623581B2 Electrostatic image developing toner, developer, and image forming apparatus
有权
静电图像显影调色剂,显影剂和图像形成装置
- Patent Title: Electrostatic image developing toner, developer, and image forming apparatus
- Patent Title (中): 静电图像显影调色剂,显影剂和图像形成装置
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Application No.: US13422801Application Date: 2012-03-16
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Publication No.: US08623581B2Publication Date: 2014-01-07
- Inventor: Tomohiro Fukao , Takuya Kadota , Yoshihiro Mikuriya , Tsuyoshi Nozaki , Yoshimichi Ishikawa , Kazuoki Fuwa , Tomoharu Miki
- Applicant: Tomohiro Fukao , Takuya Kadota , Yoshihiro Mikuriya , Tsuyoshi Nozaki , Yoshimichi Ishikawa , Kazuoki Fuwa , Tomoharu Miki
- 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: JP2011-058740 20110317
- Main IPC: G03G9/08
- IPC: G03G9/08

Abstract:
An electrostatic image developing toner including: toner particles each containing binder resin and colorant; and an external additive supported on the toner particles, wherein the toner particles each have protrusions on surface thereof, average of lengths of long sides of the protrusions is 0.10 μm or more but less than 0.50 μm, standard deviation of the lengths of the long sides of the protrusions is 0.20 or less, coverage rate of the protrusions on the surface of each toner particle is 30% to 90%, the external additive includes at least two different particles including external additive (A) and one or more external additives (B), external additive (A) has longest average primary particle diameter among the external additives and charged to have the opposite polarity to the toner particles, and at least one of the external additives (B) is charged to have the same polarity as the toner particles.
Public/Granted literature
- US20120237267A1 ELECTROSTATIC IMAGE DEVELOPING TONER, DEVELOPER, AND IMAGE FORMING APPARATUS Public/Granted day:2012-09-20
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