Toner for electrophotography, developer for electrophotography, image forming apparatus, and process cartridge
AssigneeRicoh Company, Ltd.
InventorsYoshitaka Yamauchi, Hisashi Nakajima, Kazumi Suzuki, Namie Suzuki
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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.
Claims7
A toner for electrophotography, the toner comprising:
- an amorphous polyester resin;
- an addition polymerization-based resin;
- and
- wax that is an ester wax or a carnauba wax,
- wherein:
- the amount of the amorphous polyester resin is from 75 parts by mass through 95 parts by mass relative to 100 parts by mass of the toner;
- and
- the toner satisfies relationships represented by formulas (1) and (2):
- (Formula 1) SPr>SPw>SPd (1)
- (Formula 2) |SPr−SPw|>|SPw−SPd| (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.
Dependencies are inferred from the claim text.