发明授权
- 专利标题: Toner, developer, toner storage unit, image forming apparatus, and image forming method
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申请号: US16238566申请日: 2019-01-03
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公开(公告)号: US10599058B2公开(公告)日: 2020-03-24
- 发明人: Taichi Nemoto , Toma Takebayashi
- 申请人: Taichi Nemoto , Toma Takebayashi
- 申请人地址: JP Tokyo
- 专利权人: Ricoh Company, Ltd.
- 当前专利权人: Ricoh Company, Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Oblon, McClelland, Maier & Neustadt, L.L.P.
- 优先权: JP2018-009690 20180124
- 主分类号: G03G9/08
- IPC分类号: G03G9/08 ; G03G9/087 ; G03G15/08
摘要:
A toner comprising a binder resin is provided. When the toner is observed with an atomic force microscope in tapping mode to obtain a phase image and the phase image is binarized with an intermediate value between maximum and minimum phase difference values in the phase image to obtain a binarized image, the binarized image consists of first phase-contrast portions having a large phase difference and second phase-contrast portions having a small phase difference, where the first phase-contrast portions are dispersed in the second phase-contrast portions and a dispersion diameter of the first phase-contrast portions is in a range of from 150 to 500 nm. The toner has at least two glass transition temperatures (Tg) in respective ranges of from 40° C. to 65° C. and from −30° C. to 20° C., determined from a DSC curve obtained at a first temperature rise in a differential scanning calorimetric measurement by a midpoint method.