Invention Grant
- Patent Title: Magnetic toner
- Patent Title (中): 磁性调色剂
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Application No.: US14571167Application Date: 2014-12-15
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Publication No.: US09304422B2Publication Date: 2016-04-05
- Inventor: Takashi Matsui , Michihisa Magome , Kozue Uratani , Atsuhiko Ohmori
- Applicant: CANON KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: CANON KABUSHIKI KAISHA
- Current Assignee: CANON KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Agency: Fitzpatrick, Cella, Harper and Scinto
- Priority: JP2013-269544 20131226
- Main IPC: G03G9/087
- IPC: G03G9/087 ; G03G9/083 ; G03G9/08 ; G03G9/097

Abstract:
It is intended to provide magnetic toner that produces a stable image density in long-term use and can prevent ghosting under conditions of low-temperature and low-humidity. The present invention provides magnetic toner including magnetic toner particles each containing a binder resin, a magnetic material and a releasing agent, and silica fine particles, wherein the silica fine particles include silica fine particles A and B, the silica fine particles A have a number-average particle size of 5-20 nm as primary particles, the silica fine particles B are produced by a sol-gel method, and have a number-average particle size of 40-200 nm as primary particles, an abundance ratio of secondary particles of the silica fine particles B is 5-40% by number, and a coverage ratio X1 of the surface of the magnetic toner particles with the silica fine particles determined by ESCA is 40.0-75.0% by area.
Public/Granted literature
- US20150185644A1 MAGNETIC TONER Public/Granted day:2015-07-02
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