Invention Grant
- Patent Title: Magnetic toner
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Application No.: US16584346Application Date: 2019-09-26
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Publication No.: US10859933B2Publication Date: 2020-12-08
- Inventor: Tetsuya Kinumatsu , Kosuke Fukudome , Yusuke Hasegawa
- Applicant: CANON KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: CANON KABUSHIKI KAISHA
- Current Assignee: CANON KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Agency: Venable LLP
- Priority: JP2018-187459 20181002
- Main IPC: G03G9/08
- IPC: G03G9/08 ; G03G9/087 ; G03G9/083

Abstract:
A magnetic toner comprising a magnetic toner particle including a binder resin, a magnetic body and a crystalline polyester, wherein the dielectric loss tangent at 100 kHz is 1.0×10−2 or more, a variation coefficient CV3 of an occupied area ratio of the magnetic body when a cross section of the magnetic toner particle is divided by a square grid having a side of 0.8 μm in cross-sectional observation of the magnetic toner particle using a transmission electron microscope TEM is from 30.0% to 80.0%, and where a storage elastic modulus of the magnetic toner at 40° C. is taken as E′(40) [Pa] and a storage elastic modulus of the magnetic toner at 85° C. is taken as E′(85) [Pa], the following formulas (1) and (2) are satisfied: E′(85)≤5.5×109 (1) [E′(40)−E′(85)]×100/E′(40)≥30 (2).
Public/Granted literature
- US20200103776A1 MAGNETIC TONER Public/Granted day:2020-04-02
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