Back to results
US 11,614,694 B2Granted
Electrostatic image developer, process cartridge, image forming apparatus, and image forming method
AssigneeFUJIFILM Business Innovation Corp.
InventorsSoutaro Kakehi, Sakon Takahashi, Yutaka Saito
Life of this patent
Estimating the term…
Abstract
An electrostatic image developer includes a toner containing toner particles, a carrier, and an external additive containing titanium dioxide particles of two types having different refractive indexes, fatty acid metal salt particles, and an abrasive.
Claims13
An electrostatic image developer comprising:
- a toner containing toner particles;
- a carrier;
- and
- an external additive containing titanium dioxide particles of two types having different refractive indexes, fatty acid metal salt particles, and an abrasive,
- wherein the titanium dioxide particles of two types having different refractive indexes include titanium dioxide particles (A) adhered to the toner particles and titanium dioxide particles (B) adhered to the carrier;
- a content of the titanium dioxide particles (A) is 0.1% by mass or more and 50% by mass or less relative to a content of the titanium dioxide particles (B),
- a refractive index of the titanium dioxide particles (A) is 2.0 or more and less than 2.4;
- a refractive index of the titanium dioxide particles (B) is 2.4 or more and 2.8 or less;
- and
- the titanium dioxide particles (A) are obtained by treating titanium dioxide particles with one or more hydrophobilization treatment agents selected from the group consisting of a silane coupling agent, silicone oil, a titanate-based coupling agent, and an aluminum-based coupling agent.
7 more elements
An electrostatic image developer comprising:
- a toner containing toner particles;
- a carrier;
- and
- an external additive containing titanium dioxide particles of two types having different crystallite diameters, fatty acid metal salt particles, and an abrasive,
- wherein the titanium dioxide particles of two types having different crystallite diameters include titanium dioxide particles (A) adhered to the toner particles and titanium dioxide particles (B) adhered to the carrier;
- wherein the titanium dioxide particles of two types having different refractive indexes include titanium dioxide particles (A) adhered to the toner particles and titanium dioxide particles (B) adhered to the carrier;
- a refractive index of the titanium dioxide particles (A) is lower than a refractive index of the titanium dioxide particles (B);
- a content of the titanium dioxide particles (A) is 0.1% by mass or more and 50% by mass or less relative to a content of the titanium dioxide particles (B);
- a crystallite diameter of the titanium dioxide particles (A) is 12 nm to 16 nm;
- a crystallite diameter of the titanium dioxide particles (B) is 40 to 44 nm;
- and
- the titanium dioxide particles (A) are obtained by treating titanium dioxide particles with one or more hydrophobilization treatment agents selected from the group consisting of a silane coupling agent, silicone oil, a titanate-based coupling agent, and an aluminum-based coupling agent.
9 more elements
Dependencies are inferred from the claim text.