Non-magnetic one-component toner and image forming apparatus

Patent metadata

Field	Value
Publication number	US-2025314981-A1
Application number	US-202519091311-A
Country	US
Kind code	A1
Filing date	Mar 26, 2025
Priority date	Apr 4, 2024
Publication date	Oct 9, 2025
Grant date	—

Abstract

A non-magnetic one-component toner includes a toner particle. The toner particle includes a toner base particle and an external additive. The external additive includes a silica particle and a fluorine-containing particle. In predetermined printing in which a standard test page image defined in ISO 19752 is printed on 1000 sheets of recording media, a content Si0 of the silica particles in the toner particles before the predetermined printing and a content Si1000D of the silica particles in the toner particles in a development unit after the predetermined printing satisfy a formula (1) “0.5 Si1000D/Si0≤1.0”, and a content F0 of the fluorine-containing particles in the toner particles before the predetermined printing and a content F1000D of the fluorine-containing particles in the toner particles in the development unit after the predetermined printing satisfy a formula (2) “1.0≤F1000D/F0≤1.5”.

First claim

What is claimed is:

1 . A non-magnetic one-component toner comprising:
a toner particle, wherein the toner particle includes a toner base particle and an external additive that is adhered to a surface of the toner base particle, the external additive includes a silica particle and a fluorine-containing particle and in predetermined printing in which a standard test page image defined in ISO 19752 is printed on 1000 sheets of recording media,
a content Si 0 of the silica particles in the toner particles before the predetermined printing and a content Si 1000D of the silica particles in the toner particles in a development unit after the predetermined printing satisfy a formula (1) below, and
a content F 0 of the fluorine-containing particles in the toner particles before the predetermined printing and a content F 1000D of the fluorine-containing particles in the toner particles in the development unit after the predetermined printing satisfy a formula (2) below.

0.5
≤

Si

1000
⁢
D

/

Si
0

≤
1.

(
1
)

1.
≤

F

1000
⁢
D

/

F
0

≤

1
.
5

(
2
)

2 . The non-magnetic one-component toner according to claim 1 ,
wherein the content Si 0 of the silica particles in the toner particles before the predetermined printing and a content Si 1000C of the silica particles in the toner particles in a cleaning unit after the predetermined printing satisfy a formula (3) below, and the content F 0 of the fluorine-containing particles in the toner particles before the predetermined printing and a content F 1000C of the fluorine-containing particles in the toner particles in the cleaning unit after the predetermined printing satisfy a formula (4) below.

0.7
≤

Si

1000
⁢
C

/

Si
0

≤
0.9

(
3
)

2.
≤

F

1000
⁢
C

/

F
0

≤
2.5

(
4
)

3 . The non-magnetic one-component toner according to claim 1 ,
wherein a content of the silica particles in 100.0 parts by mass of the toner base particles before the predetermined printing is equal to or greater than 1.5 parts by mass but equal to or less than 2.5 parts by mass.

4 . The non-magnetic one-component toner according to claim 1 ,
wherein a content of the fluorine-containing particles in 100.0 parts by mass of the toner base particles before the predetermined printing is equal to or greater than 0.3 parts by mass but equal to or less than 1.0 part by mass.

5 . The non-magnetic one-component toner according to claim 1 ,
wherein a ratio WSi/WF of a content WSi of the silica particles in 100.0 parts by mass of the toner base particles before the predetermined printing to a content WF of the fluorine-containing particles in 100.0 parts by mass of the toner base particles before the predetermined printing is equal to or greater than 2.5 but equal to or less than 5.0.

6 . The non-magnetic one-component toner according to claim 1 ,
wherein a number average primary particle diameter of the silica particles is equal to or greater than 12 nm but equal to or less than 40 nm, and a number average primary particle diameter of the fluorine-containing particles is equal to or greater than 100 nm but equal to or less than 300 nm.

7 . The non-magnetic one-component toner according to claim 1 ,
wherein the fluorine-containing particle is a fluororesin particle.

8 . An image forming apparatus comprising:
an image carrying member; and a development unit that supplies a non-magnetic one-component toner to an electrostatic latent image formed on a surface of the image carrying member, wherein the non-magnetic one-component toner includes a toner particle, the toner particle includes a toner base particle and an external additive that is adhered to a surface of the toner base particle, the external additive includes a silica particle and a fluorine-containing particle and in predetermined printing in which a standard test page image defined in ISO 19752 is printed on 1000 sheets of recording media,
a content Si 0 of the silica particles in the toner particles before the predetermined printing and a content Si 1000D of the silica particles in the toner particles in the development unit after the predetermined printing satisfy a formula (1) below, and
a content F 0 of the fluorine-containing particles in the toner particles before the predetermined printing and a content F 1000D of the fluorine-containing particles in the toner particles in the development unit after the predetermined printing satisfy a formula (2) below.

Assignees

• Kyocera Document Solutions Inc

Inventors

• Mizobe Takeo
• Mori Takamichi
• Yamashita Masashi
• Terasaki Kohei
• Kubo Norio
• Yamada Ryo

Classifications

• G03G9/09716

  treated with organic compounds · CPC title

• G03G9/09708

  Inorganic compounds · CPC title

• G03G15/08

  using a solid developer, e.g. powder developer · CPC title

• G03G9/09725

  Silicon-oxides; Silicates · CPC title

• G03G9/0825 Primary

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