Invention Grant
- Patent Title: Toner for electrophotography, developer for electrophotography, image forming apparatus, and process cartridge
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Application No.: US15696818Application Date: 2017-09-06
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Publication No.: US10254668B2Publication Date: 2019-04-09
- Inventor: Yoshitaka Yamauchi , Hisashi Nakajima , Kazumi Suzuki , Namie Suzuki
- Applicant: Yoshitaka Yamauchi , Hisashi Nakajima , Kazumi Suzuki , Namie Suzuki
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd
- Current Assignee: Ricoh Company, Ltd
- Current Assignee Address: JP Tokyo
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2016-175889 20160908
- Main IPC: G03G9/08
- IPC: G03G9/08 ; G03G9/087 ; G03G15/08

Abstract:
A toner for electrophotography, the toner including an amorphous polyester resin, an addition polymerization-based resin, and wax that is ester wax or carnauba wax, wherein the toner satisfies relationships represented by Formula 1 and Formula 2 below, SPr>SPw>SPd (Formula 1) |SPr−SPw|>|SPw−SPd| (Formula 2) where SPr is a value of a solubility parameter of the amorphous polyester resin, SPw is a value of a solubility parameter of the wax, and SPd is a value of a solubility parameter of the addition polymerization-based resin.
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