Toner, developer, process cartridge, image forming apparatus, image forming method, and method for manufacturing toner

Patent metadata

Field	Value
Publication number	US-10429756-B2
Application number	US-201816009462-A
Country	US
Kind code	B2
Filing date	Jun 15, 2018
Priority date	Jun 20, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A toner is provided. The toner comprises a glittering pigment and a coloring pigment. The glittering pigment is disposed inside the toner. The coloring pigment comprises a yellow pigment comprising an isoindoline pigment.

First claim

The invention claimed is:

1. A toner comprising:
a glittering pigment disposed inside the toner; and
a coloring pigment comprising a yellow pigment comprising an isoindoline pigment,
wherein a content of the coloring pigment is from 10 to 35 parts by weight based on 100 parts by weight of the glittering pigment.

2. The toner of claim 1 , wherein the isoindoline pigment comprises C.I. Pigment Yellow 185.

3. The toner of claim 1 , wherein the coloring pigment further comprises a magenta pigment.

4. A developer comprising the toner of claim 1 .

5. A process cartridge detachably mountable on an image forming apparatus, comprising:
a photoconductor; and
a developing device containing the developer of claim 4 , configured to develop an electrostatic latent image on the photoconductor with the developer.

6. An image forming apparatus comprising:
a photoconductor;
an electrostatic latent image forming device configured to form an electrostatic latent image on the photoconductor;
a developing device containing the developer of claim 4 , configured to develop the electrostatic latent image on the photoconductor with the developer to form a toner image;
a transfer device configured to transfer the toner image onto a recording medium; and
a fixing device configured to fix the transferred toner image on the recording medium.

7. An image forming method comprising:
forming an electrostatic latent image on a photoconductor;
developing the electrostatic latent image with the developer of claim 4 to form a toner image;
transferring the toner image onto a recording medium; and
fixing the transferred toner image on the recording medium.

8. A toner comprising:
glittering pigment particles; and
coloring pigment particles,
wherein 80% or more of the coloring pigment particles are disposed at a position A and 75% or more of the glittering pigment particles are disposed at a position B,
wherein the position A and the position B are on a line connecting a center of gravity of the toner as a start point to a surface of the toner as an end point via a center of gravity of each of the coloring pigment particles and glittering pigment particles, and a distance from the start point to the position A is 0.6 times or more a total distance between the start point and the end point and a distance from the start point to the position B is less than 0.6 times the total distance.

9. The toner according to claim 8 , wherein the isoindoline pigment comprises C.I. Pigment Yellow 185.

10. A method for manufacturing toner, comprising:
dispersing an organic liquid, comprising a glittering pigment and a coloring pigment, in an aqueous medium to form an oil-in-water (O/W) emulsion,
wherein the coloring pigment comprises a yellow pigment comprising an isoindoline pigment,
and wherein a content of the coloring pigment is from 10 to 35 parts by weight based on 100 parts by weight of the glittering pigment.

Assignees

• Fuwa Kazuoki
• Yamashita Hiroshi
• Mizoguchi Yuka
• Hashida Shizuka
• Takebayashi Toma
• Yamaguchi Junko
• Kamei Maia
• Ohta Keisuke
• Ricoh Co Ltd

Inventors

• Fuwa Kazuoki
• Yamashita Hiroshi
• Mizoguchi Yuka
• Hashida Shizuka
• Takebayashi Toma
• Yamaguchi Junko
• Kamei Maia
• Ohta Keisuke

Classifications

• G03G9/0902 Primary

  Inorganic compounds · CPC title

• G03G9/0926

  characterised by physical or chemical properties · CPC title

• G03G9/0924

  Dyes characterised by specific substituents · CPC title

• G03G9/0912

  Indigoid; Diaryl and Triaryl methane; Oxyketone dyes · CPC title

• G03G2215/0604

  solid type · CPC title