Toner

Patent metadata

Field	Value
Publication number	US-2025181003-A1
Application number	US-202418962739-A
Country	US
Kind code	A1
Filing date	Nov 27, 2024
Priority date	Dec 1, 2023
Publication date	Jun 5, 2025
Grant date	—

Abstract

A toner includes toner particles. A cohesion cluster containing fine silica particles and a binder component is present on surfaces of the toner particles. The toner includes fatty acid metal salt particles. An arithmetic mean value of a Feret diameter of the cohesion cluster is 1,000 to 8,000 nm. A number percentage CI of toner particles having the cohesion cluster is 1 to 15 number %. Number percentages of toner particles having the cohesion cluster in the toner after treatment under ultrasonic wave conditions A and B are represented by Ca and Cb, respectively. CI, Ca, and Cb satisfy formulae (1) and (2): ultrasonic wave condition A: output frequency 30 kHz, output capacity 0.75 W, irradiation time 300 s, ultrasonic wave condition B: output frequency 30 kHz, output capacity 25 W, irradiation time 300 s

0.9
≤

Ca

/
CI

≤
1.

Formula
⁢

(
1
)

0.1

≤

Cb
/
CI

≤

0
⁢

.40
.

Formula
⁢

(
2
)

First claim

What is claimed is:

1 . A toner comprising:
toner particles, wherein a cohesion cluster containing fine silica particles and a binder component is present on surfaces of the toner particles, and the toner further comprises particles of a fatty acid metal salt, an arithmetic mean value Ag of a Feret diameter of the cohesion cluster is 1,000 nm or more and 8,000 nm or less, a number percentage of toner particles having the cohesion cluster is represented by CI (number %), CI is 1 number % or more and 15 number % or less, and a number percentage of toner particles having the cohesion cluster in the toner after being treated under an ultrasonic wave condition A is represented by Ca (number %), and a number percentage of toner particles having the cohesion cluster in the toner after being treated under an ultrasonic wave condition B is represented by Cb (number %), CI, Ca, and Cb satisfy formulae (1) and (2): ultrasonic wave condition A: output frequency 30 kHz, output capacity 0.75 W, and irradiation time 300 s ultrasonic wave condition B: output frequency 30 kHz, output capacity 25 W, and irradiation time 300 s

0.9
≤

Ca

/
CI

≤
1.

Formula
⁢

(
1
)

0.1

≤

Cb
/
CI

≤

0
⁢

.40
.

Formula
⁢

(
2
)

2 . The toner according to claim 1 , wherein the particles of the fatty acid metal salt are included in the cohesion cluster or present on the surfaces of the toner particles.

3 . The toner according to claim 1 , wherein on a surface of a toner particle having the cohesion cluster observed with a scanning electron microscope, an area fraction of the binder component of the cohesion cluster is 5% or more and 50% or less relative to an entirety of the cohesion cluster.

4 . The toner according to claim 1 , wherein the toner comprises the particles of the fatty acid metal salt in an amount of 0.1% by mass or more and 3.0% by mass or less.

5 . The toner according to claim 1 , wherein when a dispersion liquid prepared by treating the toner under the ultrasonic wave condition A is measured with a flow particle image measuring apparatus, a presence ratio YA (number %) of particles with a size of less than 4 μm is 20 number % or more and 50 number % or less.

6 . The toner according to claim 1 , wherein on a surface of a toner particle having the cohesion cluster observed with a scanning electron microscope, an area fraction of the fatty acid metal salt of the cohesion cluster is 2% or more and 30% or less relative to an entirety of the cohesion cluster.

7 . The toner according to claim 1 , comprising fine silicone resin particles on the surfaces of the toner particles as an external additive.

Assignees

• Canon Kk

Inventors

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

Classifications

• G03G9/08 Primary

  with toner particles · CPC title

• G03G9/0825

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

• G03G9/09708

  Inorganic compounds · CPC title

• G03G9/09716

  treated with organic compounds · CPC title

• G03G9/08708

  Copolymers of styrene · CPC title