Granted Patent B2

US 12,405,543 · App. 17/804,879 · Granted Sep 2, 2025

Inventors: Hirofumi Kyuushima (Tokyo, JP); Takayuki Toyoda (Shizuoka, JP); Naoya Isono (Shizuoka, JP); Tomoya Nagaoka (Tokyo, JP); Masao Suzuki (Kanagawa, JP)

Assignee: CANON KABUSHIKI KAISHA

G03G9/092G03G9/0821G03G9/08755G03G9/08782G03G9/09733

Abstract

Claims (12)

1. A toner, comprising:

a toner particle comprising a binder resin, a pigment having a quinacridone structure, and a compound represented by formula (1)

when R represents a linear or branched alkyl group having 8 to 18 carbon atoms, and n is an integer of 1 or 2, wherein

an amount of the compound represented by formula (1) in the toner is 5 to 500 ppm on a mass basis, and

the toner has a storage elastic modulus at 100° C. in a viscoelasticity measurement of 5,000 to 25,000 Pa.

2. The toner according to claim 1 , wherein the binder resin has an SP value (cal/cm 3 ) 0.5 of 9.50 to 11.50.

3. The toner according to claim 1 , wherein a ratio of an amount of the pigment to an amount of the compound represented by formula (1) in the toner is 100 to 10,000 on a mass basis.

4. The toner according to claim 1 , wherein the pigment is at least one member selected from the group consisting of C. I. Pigment Red 122, C. I. Pigment Red 202 and C. I. Pigment Violet 19.

5. The toner according to claim 1 , wherein n is 1.

6. The toner according to claim 1 , wherein the binder resin has an SP value (cal/cm 3 ) 0.5 of 9.60 to 10.60.

7. The toner according to claim 1 , wherein the toner particle further comprises an ester wax.

8. The toner according to claim 7 , wherein an amount of the ester wax is 6.0 to 14.0 parts by mass with respect to 100.0 parts by mass of the binder resin.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (126)