Toner, developer, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-9588451-B2
Application number	US-201514696881-A
Country	US
Kind code	B2
Filing date	Apr 27, 2015
Priority date	May 12, 2014
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A toner, wherein an amount of Al detected in the toner is 0.7% to 1.3%, where the amount of Al detected is determined based on quantitative analysis of Al by X-ray photoelectron spectroscopic analysis (XPS), and wherein [Tg2nd (THF insoluble matter)] is −40° C. to 30° C., where the [Tg2nd (THF insoluble matter)] is a glass transition temperature measured in second heating of differential scanning calorimetry (DSC) of THF insoluble matter of the toner.

First claim

What is claimed is:

1. A toner, comprising:
a non-crystalline polyester resin;
a crystalline polyester resin; and
a charge controlling agent,
wherein an amount of Al detected in the toner is 0.7 atomic % to 1.3 atomic %, where the amount of Al detected is determined based on quantitative analysis of Al by X-ray photoelectron spectroscopic analysis (XPS), and
[Tg2nd (THF insoluble matter)] is −40° C. to 30° C., where the [Tg2nd (THF insoluble matter)] is a glass transition temperature of a THF insoluble component of the toner measured by differential scanning calorimetry (DSC) after heating the THF insoluble component from −80° C. to 150° C. at a heating rate of 10° C./min in a nitrogen atmosphere, cooling the THF insoluble component from 150° C. to −80° C. at a cooling rate of 10° C./min, and then heating the THF insoluble component to 150° C. at a heating rate of 10° C./min.

2. The toner according to claim 1 , wherein [Tg1st (toner)] is 20° C. to 50° C., where the [Tg1st (toner)] is a glass transition temperature of the toner measured by differential scanning calorimetry (DSC) during heating the toner from −80° C. to 150° C. at a heating rate of 10° C./min in a nitrogen atmosphere.

3. The toner according to claim 1 , wherein [Tg2nd (toner)] is 0° C. to 30° C., where the [Tg2nd (toner)] is a glass transition temperature of the toner measured by differential scanning calorimetry (DSC) after heating the toner from −80° C. to 150° C. at a heating rate of 10° C./min in a nitrogen atmosphere, cooling the toner from 150° C. to −80° C. at a cooling rate of 10° C./min, and then heating the toner to 150° C. at a heating rate of 10° C./min.

4. The toner according to claim 1 , wherein the non-crystalline polyester resin has a cross-linked structure.

5. The toner according to claim 1 , wherein the crystalline polyester resin has a weight average molecular weight of 3,000 to 30,000.

6. The toner according to claim 1 , wherein the charge controlling agent comprises an organic modified smectite.

7. The toner according to claim 1 , wherein the toner is produced by a method comprising washing a toner base particle by supplying an alkaline compound to the toner base particle.

8. A developer, comprising:
the toner according to claim 1 ; and
a carrier.

9. An image forming apparatus, comprising:
an electrostatic latent image bearer;
an electrostatic latent image forming unit configured to form an electrostatic latent image on the electrostatic latent image bearer; and
a developing unit containing a toner and configured to develop the electrostatic latent image formed on the electrostatic latent image bearer to form a visible image,
wherein an amount of Al detected in the toner is 0.7 atomic % to 1.3 atomic %, where the amount of Al detected is determined based on quantitative analysis of Al by X-ray photoelectron spectroscopic analysis (XPS), and [Tg2nd (THF insoluble matter)] of the toner is −40° C. to 30° C., where the [Tg2nd (THF insoluble matter)] is a glass transition temperature of a THF insoluble component of the toner measured by differential scanning calorimetry (DSC) after heating the THF insoluble component from −80° C. to 150° C. at a heating rate of 10° C./min in a nitrogen atmosphere, cooling the THF insoluble component from 150° C. to −80° C. at a cooling rate of 10° C./min, and then heating the THF insoluble component to 150° C. at a heating rate of 10° C./min.

10. The toner according to claim 1 , wherein the non-crystalline polyester resin has a non-linear structure and a glass transition temperature of from −65° C. to 40° C.

11. The toner according to claim 10 , further comprising:
a second non-crystalline polyester resin having a glass transition temperature of from 40° C. to 80° C.

12. The toner according to claim 11 , wherein the non-crystalline polyester resin has a non-linear structure and wherein the toner includes from 5 parts by mass to 25 parts by mass of the non-crystalline, non-linear polyester resin, from 50 parts by mass to 90 parts by mass of the second non-crystalline polyester resin, and from 3 parts by mass to 20 parts by mass of the crystalline polyester resin, relative to 100 parts by mass of the toner.

13. The toner according to claim 11 , wherein the non-crystalline polyester resin has a non-linear structure and wherein the toner includes from 10 parts by mass to 20 parts by mass of the non-crystalline, non-linear polyester resin, from 60 parts by mass to 80 parts by mass of the second non-crystalline polyester resin, and from 5 parts by mass to 15 parts by mass of the crystalline polyester resin, relative to 100 parts by mass of the toner.

14. The toner according to claim 1 , wherein the non-crystalline polyester resin has a non-linear structure, a glass transition temperature of from −65° C. to 40° C., and a weight average molecular weight of from 10,000 to 100,000.

15. The toner according to claim 1 , further comprising:
a second non-crystalline polyester resin having a glass transition temperature of from 40° C. to 80° C. and a weight average molecular weight of from 3,000 to 10,000.

16. The toner according to claim 1 , wherein the non-crystalline polyester resin has a non-linear structure and wherein the toner includes from 5 parts by mass to 25 parts by mass of the non-crystalline, non-linear polyester resin and from 3 parts by mass to 20 parts by mass of the crystalline polyester resin, relative to 100 parts by mass of the toner.

17. The toner according to claim 1 , wherein the non-crystalline polyester resin has a non-linear structure and wherein the toner includes from 10 parts by mass to 20 parts by mass of the non-crystalline, non-linear polyester resin and from 5 parts by mass to 15 parts by mass of the crystalline polyester resin, relative to 100 parts by mass of the toner.

18. The toner according to claim 1 , wherein the non-crystalline polyester resin has a non-linear structure and a glass transition temperature of from −65° C. to 0° C.

19. The toner according to claim 1 , wherein the non-crystalline polyester resin has a non-linear structure and is prepared by polycondensation of a diol, a dicarboxylic acid, and at least one of a trihydric or higher alcohol and a trivalent or higher carboxylic acid.

20. The toner according to claim 1 , further comprising:
an additive selected from the group consisting of a release agent, a colorant, an external additive, a flow improving agent, a cleaning improving agent, and a magnetic material.

Assignees

• Takeyama Akihiro
• Nakayama Shinya
• Saitoh Akinori
• Nagai Shinsuke
• Takeda Hiroyuki
• Ricoh Co Ltd

Inventors

• Takeyama Akihiro
• Nakayama Shinya
• Saitoh Akinori
• Nagai Shinsuke
• Takeda Hiroyuki

Classifications

• G03G9/0815

  Post-treatment · CPC title

• G03G9/08755 Primary

  Polyesters · CPC title

• G03G9/08793

  Crosslinked polymers · CPC title

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• G03G9/09716

  treated with organic compounds · CPC title