IP Library › Granted Patent US 12681403
Granted Patent B2
US 12681403 · App. 18/188,487 · Granted Jul 14, 2026

Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, and image forming apparatus

Inventors: Moegi Iguchi (Kanagawa, JP); Yosuke Tsurumi (Kanagawa, JP); Yukiko Kamijo (Kanagawa, JP)
Assignee: FUJIFILM Business Innovation Corp.
G03G9/09716G03G9/09725
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Quick Facts
Patent No.
US 12681403
App. No.
18/188,487
Granted
Jul 14, 2026
Kind
B2
Abstract

An electrostatic charge image developing toner contains alkylsilane-treated silica particles, a linear aliphatic hydrocarbon having 10 or more and 18 or less carbon atoms, and toner particles.

Claims (48)

1 . An electrostatic charge image developing toner comprising:

alkylsilane-treated silica particles;

a linear aliphatic hydrocarbon having 10 or more and 18 or less carbon atoms; and

toner particles,

wherein a content of the linear aliphatic hydrocarbon is 50 ppm or more and 1,000 ppm or less with respect to a total amount of the silica particles.

2 . The electrostatic charge image developing toner according to claim 1 ,

wherein the alkylsilane is at least one kind of compound selected from the group consisting of alkylsilanes represented by Formula (1), Formula (2), and Formula (3),

(in Formula (1) to Formula (3), R 1 to R 12 each independently represent an alkyl group having 1 or more and 3 or less carbon atoms).

3 . The electrostatic charge image developing toner according to claim 2 ,

wherein all of alkyl groups of the alkylsilane are methyl groups.

4 . The electrostatic charge image developing toner according to claim 1 ,

wherein the linear aliphatic hydrocarbon is a linear alkane.

5 . The electrostatic charge image developing toner according to claim 4 ,

wherein the number of carbon atoms in the linear alkane is 10 or more and 16 or less.

6 . The electrostatic charge image developing toner according to claim 1 ,

wherein a ratio of the content of the linear aliphatic hydrocarbon to a surface treatment amount of the alkylsilane (content of linear aliphatic hydrocarbon/surface treatment amount of alkylsilane) is 0.0001 or more and 0.01 or less.

7 . The electrostatic charge image developing toner according to claim 1 ,

wherein the linear aliphatic hydrocarbon is contained in the silica particles.

8 . An electrostatic charge image developer comprising:

the electrostatic charge image developing toner according to claim 1 .

9 . An electrostatic charge image developer comprising:

the electrostatic charge image developing toner according to claim 2 .

10 . An electrostatic charge image developer comprising:

the electrostatic charge image developing toner according to claim 3 .

11 . An electrostatic charge image developer comprising:

the electrostatic charge image developing toner according to claim 4 .

12 . An electrostatic charge image developer comprising:

the electrostatic charge image developing toner according to claim 5 .

13 . An electrostatic charge image developer comprising:

the electrostatic charge image developing toner according to claim 6 .

14 . An electrostatic charge image developer comprising:

the electrostatic charge image developing toner according to claim 7 .

15 . A toner cartridge comprising:

a container that contains the electrostatic charge image developing toner according to claim 1 ,

wherein the toner cartridge is detachable from an image forming apparatus.

16 . A toner cartridge comprising:

a container that contains the electrostatic charge image developing toner according to claim 2 ,

wherein the toner cartridge is detachable from an image forming apparatus.

17 . A process cartridge comprising:

a developing unit that contains the electrostatic charge image developer according to claim 8 and develops an electrostatic charge image formed on a surface of an image holder as a toner image by using the electrostatic charge image developer,

wherein the process cartridge is detachable from an image forming apparatus.

18 . An image forming apparatus comprising:

an image holder;

a charging unit that charges a surface of the image holder;

an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holder;

a developing unit that contains the electrostatic charge image developer according to claim 8 and develops the electrostatic charge image formed on the surface of the image holder as a toner image by using the electrostatic charge image developer;

a transfer unit that transfers the toner image formed on the surface of the image holder to a surface of a recording medium; and

a fixing unit that fixes the toner image transferred to the surface of the recording medium.