IP Library › Granted Patent US 10,429,756
Granted Patent B2
US 10,429,756 · App. 16/009,462 · Granted Oct 1, 2019

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

Inventors: Kazuoki Fuwa (Shizuoka, JP); Hiroshi Yamashita (Shizuoka, JP); Yuka Mizoguchi (Shizuoka, JP); Shizuka Hashida (Saitama, JP); Toma Takebayashi (Shizuoka, JP); Junko Yamaguchi (Shizuoka, JP); Maia Kamei (Tokyo, JP); Keisuke Ohta (Shizuoka, JP)
Assignee: Ricoh Company, Ltd.
G03G9/0902G03G9/0906G03G9/0912G03G9/0924G03G9/0926G03G15/08G03G2215/0604
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Quick Facts
Patent No.
US 10,429,756
App. No.
16/009,462
Granted
Oct 1, 2019
Kind
B2
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.

Claims (31)

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.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 15, 2018
From: FUWA, KAZUOKI; YAMASHITA, HIROSHI; MIZOGUCHI, YUKA; HASHIDA, SHIZUKA; TAKEBAYASHI, TOMA; YAMAGUCHI, JUNKO; KAMEI, MAIA; OHTA, KEISUKE
To: RICOH COMPANY, LTD.
Reel/Frame 046097/0939 →
Priority Claims (3)
JP 2017-120688 · Jun 20, 2017 · national
JP 2017-129533 · Jun 30, 2017 · national
JP 2018-104805 · May 31, 2018 · national
Continuity (1)
Related Publication 20180364600A1 · Dec 20, 2018
Cited By (1)
US 12,416,872