Toner
AssigneeKYOCERA Document Solutions Inc.
InventorSho Sumioka
Life of this patent
Estimating the term…
Abstract
A toner includes toner particles. The toner particles each include a core, a shell layer, and an external additive. The core contains a first thermoplastic resin as a binder resin. The shell layer partially covers a surface of the core. The external additive is attached to regions of the surface of the core that are not covered with the shell layer. The external additive includes external additive particles. The external additive particles protrude outward in radial directions of the core further than a surface of the shell layer. At least part of surfaces of the external additive particles is exposed from the shell layer. The shell layer contains a second thermoplastic resin or a thermosetting resin. The second thermoplastic resin has a higher softening point than the core. The shell layer has a thickness of at least 5 nm.
Claims8
A toner comprising toner particles, wherein
- the toner particles each include a core, a shell layer, and an external additive, the core containing a first thermoplastic resin as a binder resin, the shell layer partially covering a surface of the core, the external additive being attached to regions of the surface of the core that are not covered with the shell layer,
- the external additive includes external additive particles,
- the external additive particles protrude outward in radial directions of the core further than a surface of the shell layer,
- at least part of surfaces of the external additive particles is exposed from the shell layer,
- the shell layer contains a second thermoplastic resin or a thermosetting resin, the second thermoplastic resin having a higher softening point than the core, and
- the shell layer has a thickness of at least 5 nm.
Dependencies are inferred from the claim text.