Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge

Patent metadata

Field	Value
Publication number	US-9726994-B1
Application number	US-201615213869-A
Country	US
Kind code	B1
Filing date	Jul 19, 2016
Priority date	Feb 10, 2016
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles whose compression aggregation degree is from 60% to 95% and particle compression ratio is from 0.20 to 0.40 and polishing agent particles.

First claim

What is claimed is:

1. An electrostatic charge image developing toner comprising:
toner particles containing a binder resin; and
an external additive including silica particles whose compression aggregation degree is from 60% to 95% and particle compression ratio is from 0.20 to 0.40, and polishing agent particles.

2. The electrostatic charge image developing toner according to claim 1 ,
wherein the polishing agent particles is at least one selected from the group consisting of a cerium oxide particle, an alumina particle, and a strontium titanate particle.

3. The electrostatic charge image developing toner according to claim 1 ,
wherein an average equivalent circle diameter of the polishing agent particles is 0.1 μm to 10 μm.

4. The electrostatic charge image developing toner according to claim 1 ,
wherein an external addition amount of the polishing agent particles is from 0.1% by weight to 3% by weight with respect to an entirety of the toner particles.

5. The electrostatic charge image developing toner according to claim 1 ,
wherein an average equivalent circle diameter of the silica particles is from 40 nm to 200 nm.

6. The electrostatic charge image developing toner according to claim 1 ,
wherein a particle dispersion degree of the silica particles is from 90% to 100%.

7. The electrostatic charge image developing toner according to claim 1 ,
wherein an average circularity of the silica particles is from 0.85 to 0.98.

8. The electrostatic charge image developing toner according to claim 1 ,
wherein the silica particles are sol-gel silica particles.

9. The electrostatic charge image developing toner according to claim 1 ,
wherein an average circularity of the toner particles is from 0.94 to 1.00.

10. The electrostatic charge image developing toner according to claim 1 ,
wherein the silica particles are silica particles which are surface-treated with a siloxane compound whose viscosity is from 1,000 cSt to 50,000 cSt, and a surface attachment amount of the siloxane compound is from 0.01% by weight to 5% by weight.

11. The electrostatic charge image developing toner according to claim 10 ,
wherein the siloxane compound is silicone oil.

12. An electrostatic charge image developer comprising:
the electrostatic charge image developing toner according to claim 1 .

13. A toner cartridge comprising:
a container containing the electrostatic charge image developing toner according to claim 1 ,
wherein the toner cartridge is detachable from an image forming apparatus.

Assignees

• Fuji Xerox Co Ltd

Inventors

• Eri Yoshifumi
• Okuno Hiroyoshi
• Inoue Satoshi
• Iida Yoshifumi
• Nakajima Tomohito
• Zenitani Yuka
• Iwanaga Takeshi
• Takeuchi Sakae
• Nozaki Shunsuke
• Kadokura Yasuo
• Morooka Yasuhisa

Classifications

• G03G9/0821 Primary

  characterised by physical parameters (magnetic parameters G03G9/083) · CPC title

• G03G9/09716

  treated with organic compounds · CPC title

• G03G15/08

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

• G03G2215/0132

  vertical medium transport path at the secondary transfer · CPC title

• G03G9/09725

  Silicon-oxides; Silicates · CPC title