Toner

Patent metadata

Field	Value
Publication number	US-2025181002-A1
Application number	US-202418959006-A
Country	US
Kind code	A1
Filing date	Nov 25, 2024
Priority date	Dec 1, 2023
Publication date	Jun 5, 2025
Grant date	—

Abstract

On the surface of a toner particle, a cohesion cluster containing a silica fine particle and a binding component is present. When a ratio by number of toner particles each having the cohesion cluster is denoted by CI (percent by number), the CI is 1 percent by number or more and 15 percent by number or less. When a ratio by number of toner particles each having the cohesion cluster in a toner subjected to processing under a weak ultrasound condition A is denoted by Ca (percent by number) and a ratio by number of toner particles each having the cohesion cluster in a toner subjected to processing under a strong ultrasound condition B is denoted by Cb (percent by number), the CI, the Ca, and the Cb satisfy formulae (1) and (2):

0.9
≤

Ca
/
CI

≤
1.

,
and

(
1
)

0.05
≤

Cb
/
CI

≤

0
⁢

.25
.

(
2
)

First claim

What is claimed is:

1 . A toner comprising:
a toner particle, wherein the toner particle contains a binding resin and an ester wax, wherein 2.0 parts by mass or more of the ester wax is compatible with 100.0 parts by mass of the binding resin at 100° C., wherein, on a surface of the toner particle, a cohesion cluster containing a silica fine particle and a binding component is present, wherein, when a ratio by number of toner particles each having the cohesion cluster is denoted by CI (percent by number), the CI is 1 percent by number or more and 15 percent by number or less, and wherein, when a ratio by number of toner particles each having the cohesion cluster in a toner subjected to processing under the following ultrasound condition A is denoted by Ca (percent by number) and a ratio by number of toner particles each having the cohesion cluster in a toner subjected to processing under the following ultrasound condition B is denoted by Cb (percent by number), the CI, the Ca, and the Cb satisfy formulae (1) and (2): ultrasound condition A: an output frequency of 30 kilohertz (kHz), an output capacity of 0.75 watt (W), and an irradiation time of 300 seconds(s), and ultrasound condition B: an output frequency of 30 kHz, an output capacity of 30 W, and an irradiation time of 300 s,

0.9
≤

Ca
/
CI

≤
1.

,
and

(
1
)

0.05
≤

Cb
/
CI

≤

0
⁢

.25
.

(
2
)

2 . The toner according to claim 1 , wherein the binding resin is a resin containing a styrene acrylic copolymer.

3 . The toner according to claim 1 , wherein the binding resin is a resin containing a polyester part.

4 . The toner according to claim 1 , wherein an arithmetic mean value Ag of Feret diameters of the cohesion cluster is 1,000 nanometers (nm) or more and 8,000 nm or less.

5 . The toner according to claim 1 , wherein the toner further comprises an external additive, and the external additive includes a spherical silica particle a number average particle diameter of a primary particle of which is 50 nanometers (nm) or more and 300 nm or less.

6 . The toner according to claim 5 , wherein the external additive further includes a hydrotalcite particle.

7 . The toner according to claim 1 , wherein the ester wax is a diester wax.

8 . The toner according to claim 7 , wherein the diester wax is an ester compound of a diol with a carbon number of 2 or more and 6 or less and a monocarboxylic acid with a carbon number of 14 or more and 22 or less.

Assignees

• Canon Kk

Inventors

• Ookubo Kenji
• Nozaki Dai
• Uno Masashi
• Kototani Shohei

Classifications

• G03G9/09716

  treated with organic compounds · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/0825

  characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093) · CPC title

• G03G9/08782 Primary

  Waxes · CPC title