Toner, image forming apparatus, image forming method, and toner accommodating unit

Patent metadata

Field	Value
Publication number	US-10451987-B2
Application number	US-201816210003-A
Country	US
Kind code	B2
Filing date	Dec 5, 2018
Priority date	Dec 25, 2017
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A toner includes a europium complex represented by the following Chemical formula

where A represents 2-naphthyl group, 2-naphthyl group having a substitution group selected from the group consisting of an alkyl group, an alkoxy group, and a halogen, R represents a fluoroalkyl group having one to three carbon atoms or a methyl group, and R 1 , R 2 , R 3 , and R 4 each, independently represent hydrogen atoms, alkyl groups, or aryl groups, wherein the toner has a hydroxyl value of from 20 to 40 mgKOH/g.

First claim

What is claimed is:

1. A toner comprising:
a europium complex represented by the following Chemical formula 1

where A represents 2-naphthyl group, 2-naphthyl group having a substitution group selected from the group consisting of an alkyl group, an alkoxy group, and a halogen, R represents a fluoroalkyl group having one to three carbon atoms or a methyl group, and R 1 , R 2 , R 3 , and R 4 each, independently represent hydrogen atoms, alkyl groups, or aryl groups,
wherein the toner has a hydroxyl value of from 20 to 40 mgKOH/g.

2. The toner according to claim 1 , wherein the hydroxyl value is from 30 to 40 mgKOH/g.

3. The toner according to claim 1 , wherein the toner has a portion soluble in tetrahydrofuran (THF) that has a weight average molecular of from 6,000 to 12,000.

4. The toner according to claim 1 , wherein the toner has a half efflux temperature of from 105 to 120 degrees C.

5. The toner according to claim 1 , wherein the europium complex is represented by the following Chemical formula 2:

6. An image forming apparatus comprising:
a latent electrostatic image bearer;
a latent electrostatic image forming device configured to form a latent electrostatic image on the latent electrostatic image bearer;
a developing device provided with the toner of claim 1 and configured to develop the latent electrostatic image on the latent electrostatic image bearer with the toner of claim 1 to form a toner image;
a transfer device configured to transfer the toner image onto a surface of a recording medium; and
a fixing device configured to fix the toner image on the surface of the recording medium.

7. An image forming method comprising:
forming a latent electrostatic image on a latent electrostatic image bearer;
developing the latent electrostatic image formed onto the latent electrostatic image bearer with the toner of claim 1 to form a toner image;
transferring the toner image formed on the latent electrostatic image bearer to a surface of a recording medium; and
fixing the toner image on the surface of the recording medium.

8. A toner accommodating unit comprising:
the toner of claim 1 .

Assignees

• Sawada Toyoshi
• Suzuki Kazumi
• Naito Yu
• Ricoh Co Ltd

Inventors

• Sawada Toyoshi
• Suzuki Kazumi
• Naito Yu

Classifications

• G03G9/09758

  comprising a heterocyclic ring · CPC title

• C07F5/003

  without C-Metal linkages · CPC title

• G03G9/09733

  Organic compounds (G03G9/08782 takes precedence) · CPC title

• G03G9/09783

  Organo-metallic compounds · CPC title

• G03G15/08

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