Invention Grant
- Patent Title: Toner having silica fine particles
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Application No.: US15217379Application Date: 2016-07-22
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Publication No.: US09625841B2Publication Date: 2017-04-18
- Inventor: Shuichi Hiroko , Michihisa Magome , Yusuke Hasegawa , Yoshitaka Suzumura
- 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 & Scinto
- Priority: JP2011-285912 20111227
- Main IPC: G03G9/097
- IPC: G03G9/097 ; G03G9/083 ; G03G9/08 ; G03G9/087

Abstract:
A magnetic toner contains magnetic toner particles containing a binder resin, a release agent, and a magnetic body, and inorganic fine particles present on the surface of the magnetic toner particles, wherein a ratio of coverage of the magnetic toner particles' surface by the inorganic fine particles is in a prescribed range for the magnetic toner, the inorganic fine particles contain prescribed metal oxide fine particles, with at least 85 mass % of the metal oxide fine particles being silica fine particles, the coefficient of variation on the coverage ratio A is in a prescribed range, the binder resin contains a styrene resin, in a GPC measurement of a THF-soluble matter in the magnetic toner, a peak molecular weight (Mp) of a main peak is in a prescribed range, and a prescribed fatty acid ester compound is incorporated as a release agent.
Public/Granted literature
- US20160327881A1 MAGNETIC TONER Public/Granted day:2016-11-10
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