Electrostatic image developing toner and electrostatic image developer

Patent metadata

Field	Value
Publication number	US-12314003-B2
Application number	US-202117514497-A
Country	US
Kind code	B2
Filing date	Oct 29, 2021
Priority date	May 25, 2021
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

An electrostatic image developing toner includes a toner particle including a binder resin and a colorant. The net intensity N S of sulfur included in the toner particle and the total net intensity N A of an alkali metal and an alkaline-earth metal included in the toner particle, which are measured by X-ray fluorescence analysis, satisfy 1.0<N S /N A <22.0.

First claim

What is claimed is:

1. An electrostatic image developing toner comprising a toner particle including:
a binder resin;
a colorant;
an alkali metal; and
an alkaline-earth metal,
wherein a net intensity N S of sulfur included in the toner particle and a total net intensity N A of the alkali metal and the alkaline-earth metal included in the toner particle, the net intensity N S and the net intensity N A being measured by X-ray fluorescence analysis, satisfy 1.0<N S /N A <22.0,
the net intensity N S of sulfur is 3.5 kcps or more and 5.5 kcps or less, and
the net intensity N S of sulfur and a net intensity N M of Mg included in the toner particle, the net intensity N M being measured by X-ray fluorescence analysis, satisfy 15.0<N S /N M <22.0.

2. The electrostatic image developing toner according to claim 1 ,
wherein the net intensity N S of sulfur and the total net intensity N A of the alkali metal and the alkaline-earth metal satisfy 1.0<N S /N A <18.0.

3. The electrostatic image developing toner according to claim 1 ,
wherein the total net intensity N A of the alkali metal and the alkaline-earth metal is 0.2 kcps or more and 4.2 kcps or less.

4. The electrostatic image developing toner according to claim 3 ,
wherein the total net intensity N A of the alkali metal and the alkaline-earth metal is 2.0 kcps or more and 4.0 kcps or less.

5. The electrostatic image developing toner according to claim 1 ,
wherein a net intensity N Cl of chlorine included in the toner particle, the net intensity N Cl being measured by X-ray fluorescence analysis, is 0.10 kcps or more and 1.30 kcps or less, and
wherein the net intensity N S of sulfur and the net intensity N Cl of chlorine satisfy 3<N S /N Cl <40.

6. The electrostatic image developing toner according to claim 1 ,
wherein the alkali metal and the alkaline-earth metal include at least one element selected from the group consisting of Na, Mg, and Ca.

7. The electrostatic image developing toner according to claim 1 ,
wherein the binder resin included in the toner particle includes an amorphous polyester resin and a crystalline polyester resin.

8. The electrostatic image developing toner according to claim 7 ,
wherein the crystalline polyester resin is a polymer of an α,ω-linear aliphatic dicarboxylic acid with an α,ω-linear aliphatic diol.

9. The electrostatic image developing toner according to claim 8 ,
wherein the polymer of an α,ω-linear aliphatic dicarboxylic acid with an α,ω-linear aliphatic diol is a polymer of 1,10-decanedicarboxylic acid with 1,6-hexanediol.

10. The electrostatic image developing toner according to claim 1 ,
wherein the toner particle includes a release agent.

11. The electrostatic image developing toner according to claim 10 ,
wherein the release agent includes an ester wax.

12. The electrostatic image developing toner according to claim 1 ,
wherein, when a cross section of the toner particle is observed, an area fraction of a region in which the colorant is dispersed to the cross section of the toner particle is 60% or more and 95% or less.

13. An electrostatic image developing toner comprising a toner particle including:
a binder resin;
a colorant;
an alkali metal, and
an alkaline-earth metal,
wherein a difference between a net intensity N S of sulfur included in the toner particle and a total net intensity N A of the alkali metal and the alkaline-earth metal included in the toner particle, the net intensity N S and the net intensity N A being measured by X-ray fluorescence analysis, satisfies 0.8<N S −N A <5.0,
the net intensity N S of sulfur is 3.5 kcps or more and 5.5 kcps or less, and
the net intensity N S of sulfur and a net intensity N M of Mg included in the toner particle, the net intensity N M being measured by X-ray fluorescence analysis, satisfy 15.0<N S /N M <22.0.

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

Assignees

• Fujifilm Business Innovation Corp

Inventors

• Noguchi Daisuke
• FUJIHARA Yoshimasa
• Sugawara Atsushi
• Anno Shintaro
• Miura Satoshi

Classifications

• G03G9/09

  Colouring agents for toner particles · CPC title

• G03G9/08782

  Waxes · CPC title

• G03G9/0823

  Electric parameters · CPC title

• G03G9/09708

  Inorganic compounds · CPC title

• G03G9/09775

  containing atoms other than carbon, hydrogen or oxygen (G03G9/09741 - G03G9/09766 take precedence) · CPC title