IP Library › Granted Patent US 12663734
Granted Patent B2
US 12663734 · App. 17/808,807 · Granted Jun 23, 2026

Toner

Inventors: Tomohisa Sano (Shizuoka, JP); Kazuyuki Sato (Kanagawa, JP); Tohru Hiramatsu (Shizuoka, JP)
Assignee: CANON KABUSHIKI KAISHA
G03G9/09733G03G9/0819G03G9/08711G03G9/09725
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Quick Facts
Patent No.
US 12663734
App. No.
17/808,807
Granted
Jun 23, 2026
Kind
B2
Abstract

A toner comprising a toner particle comprising a binder resin, a crystalline material, and a silica particle, wherein a number average particle diameter D1 of the silica particle comprised in the toner particle is 400 to 3000 nm; the silica particle has a pointed portion; and the crystalline material comprises a compound having an ester group.

Claims (17)

1 . A toner, comprising:

a toner particle comprising a binder resin, a crystalline material and a silica particle;

the silica particle being present within the toner particle, and a number average particle diameter D1 of the silica particle within the toner particle being 400 to 3000 nm, wherein

the silica particle has a pointed portion, and

the crystalline material comprises a compound having an ester group.

2 . The toner according to claim 1 , wherein the toner particle further comprises a colorant, and

the colorant comprises a magnetic body as a main component.

3 . The toner according to claim 2 , wherein D1 is 2 to 20 times a number average particle diameter of the magnetic bodies.

4 . The toner according to claim 1 , wherein the compound having the ester group has a melting point of 60 to 150° C.

5 . The toner according to claim 1 , wherein the binder resin is a styrene acrylic resin.

6 . The toner according to claim 1 , wherein the compound having the ester group is an ester wax.

7 . The toner according to claim 1 , wherein the amount of the silica particle comprised in the toner particle is 0.1 to 10.0 parts by mass with respect to 100 parts by mass of the binder resin.

8 . The toner according to claim 1 , wherein a value of a mass-based ratio of the amount of the compound having the ester group in the toner particle to the amount of the silica particle comprised in the toner particle is 1.0 to 20.0.

9 . The toner according to claim 1 , wherein in cross-sectional observation of the toner particle with a transmission electron microscope, a proportion of the number of cross sections of the toner particles comprising the silica particle having the pointed portion to the number of observed cross sections of the toner particles is 90% by number or more.

10 . The toner according to claim 1 , wherein the amount of the compound having the ester group is 3.0 to 20.0 parts by mass with respect to 100 parts by mass of the binder resin.

11 . The toner according to claim 1 , wherein the toner further comprises a silica particle as an external additive on a surface of the toner particle other than the silica particle comprised in the toner particle.

12 . The toner according to claim 1 , wherein a number of the silica particle having the pointed portion is 1.0 to 30.0 per cross section of the toner particle in cross-sectional observation with a transmission electron microscope.