Toner for electrostatic image development, electrostatic image developer, and toner cartridge
A toner for electrostatic image development contains: toner base particles containing at least a nonionic surfactant, a binder resin, and a release agent; and an external additive. The content of the nonionic surfactant is from 0.05% by mass to 1% by mass inclusive based on the total mass of the toner, and the external additive contains tin oxide particles.
1. A toner for electrostatic image development comprising:
toner base particles containing at least a nonionic surfactant, an anionic surfactant, a binder resin, and a release agent; and
an external additive,
wherein a content of the nonionic surfactant is from 0.7% by mass to 1% by mass inclusive based on a total mass of the toner,
wherein the external additive contains particles consisting of tin oxide,
wherein a content of the particles consisting of tin oxide is from 0.1% by mass to 2.0% by mass inclusive based on the total mass of the toner, and
wherein a number average particle diameter of the particles consisting of tin oxide is from 0.08 μm to 4.8 μm.
2. The toner for electrostatic image development according to claim 1 , wherein a content of the particles consisting of tin oxide is from 0.1% by mass to 0.95% by mass inclusive based on the total mass of the toner.
3. The toner for electrostatic image development according to claim 1 , wherein the value of Wa/(Wa+Wb) is from 0.024 to 0.90 inclusive, where Wa is a mass of the nonionic surfactant in the toner, and Wb is a mass of the particles consisting of tin oxide in the toner.
4. The toner for electrostatic image development according to claim 1 , wherein the toner base particles further contain a coloring agent.
5. The toner for electrostatic image development according to claim 1 , wherein the toner base particles further contain 5′-chloro-3-hydroxy-2′-methoxy-2-naphthanilide.
6. The toner for electrostatic image development according to claim 5 , wherein a content of the 5′-chloro-3-hydroxy-2′-methoxy-2-naphthanilide is from 1 ppm to 300 ppm inclusive based on the total mass of the toner.
7. The toner for electrostatic image development according to claim 6 , wherein the nonionic surfactant is a compound having a polyethyleneoxy structure.
8. The toner for electrostatic image development according to claim 1 , wherein the nonionic surfactant is a compound having a polyalkyleneoxy structure.
9. The toner for electrostatic image development according to claim 1 , wherein the toner base particles are core-shell particles.
10. An electrostatic image developer comprising the toner for electrostatic image development according to claim 1 .
11. A toner cartridge comprising the toner for electrostatic image development according to claim 1 , the toner being housed in the toner cartridge, the toner cartridge being detachably attached to an image forming apparatus.
12. The toner for electrostatic image development according to claim 1 , wherein the nonionic surfactant is a compound having a polyethyleneoxy structure, and the binder resin contains a crystalline resin.
13. The toner for electrostatic image development according to claim 12 , wherein the value of Wa/(Wa+Wb) is from 0.024 to 0.90 inclusive, where Wa is a mass of the nonionic surfactant in the toner, and Wb is a mass of the particles consisting of tin oxide in the toner.
14. The toner for electrostatic image development according to claim 1 , wherein the binder resin contains a crystalline resin.
15. The toner for electrostatic image development according to claim 1 , wherein a number average particle diameter of the particles consisting of tin oxide is from 1.4 μm to 4.8 μm.
16. A toner for electrostatic image development comprising:
toner base particles containing at least a nonionic surfactant, a binder resin, and a release agent; and
an external additive,
wherein a content of the nonionic surfactant is from 0.7% by mass to 1% by mass inclusive based on a total mass of the toner,
wherein the external additive contains tin oxide particles, and
wherein the binder resin contains a crystalline resin.
17. The toner for electrostatic image development according to claim 16 , wherein a number average particle diameter of the particles consisting of tin oxide is from 1.4 μm to 4.8 μm.