Electrostatic charge image developing toner and electrostatic charge image developer

Patent metadata

Field	Value
Publication number	US-12189334-B2
Application number	US-202117500891-A
Country	US
Kind code	B2
Filing date	Oct 13, 2021
Priority date	May 25, 2021
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

An electrostatic charge image developing toner includes a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a pigment having an isoindoline skeleton, in which a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less.

First claim

What is claimed is:

1. An electrostatic charge image developing toner comprising:
a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a colorant, wherein the colorant comprises a pigment having an isoindoline skeleton,
wherein a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less, wherein a proportion of the pigment having an isoindoline skeleton in the colorant in the toner is 50% by mass or more and 100% by mass or less,
wherein the toner particle contains an amorphous resin and a crystalline resin as the binder resin, and
in a case where a cross section of the toner particle is observed, at least two domains of crystalline resins satisfy Condition (A), Condition (B1), Condition (C), and Condition (D),
Condition (A): an aspect ratio of the domain of the crystalline resin is 5 or more and 40 or less;
Condition (B1): a major axis length of the domain of the crystalline resin is 0.5 μm or more and 1.5 μm or less;
Condition (C): an angle between an extension line of the major axis of the domain of the crystalline resin and a tangent line at a contact point where the extension line is in contact with a surface of the toner particle is 60 degrees or more and 90 degrees or less; and
Condition (D): a crossing angle between extension lines of the major axes in two domains of the crystalline resins is 45 degrees or more and 90 degrees or less.

2. An electrostatic charge image developing toner comprising:
a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a colorant, wherein the colorant comprises a pigment having an isoindoline skeleton,
wherein a total Net intensity N A of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less, wherein a proportion of the pigment having an isoindoline skeleton in the colorant in the toner is 50% by mass or more and 100% by mass or less,
wherein the toner particle contains an amorphous resin and a crystalline resin as the binder resin, and
in a case where a cross section of the toner particle is observed, at least two domains of crystalline resins satisfy Condition (A), Condition (B2), Condition (C), and Condition (D),
Condition (A): an aspect ratio of the domain of the crystalline resin is 5 or more and 40 or less;
Condition (B2): a ratio of a major axis length of the domain of the crystalline resin to a maximum diameter of the toner particle in at least one of the two domain of the crystalline resins is 10% or more and 30% or less;
Condition (C): an angle between an extension line of the major axis of the domain of the crystalline resin and a tangent line at a contact point where the extension line is in contact with a surface of the toner particle is 60 degrees or more and 90 degrees or less; and
Condition (D): a crossing angle between extension lines of the major axes in two domains of the crystalline resins is 45 degrees or more and 90 degrees or less.

3. The electrostatic charge image developing toner according to claim 1 ,
wherein the Net intensity NA is 2.00 kcps or more and 3.50 kcps or less.

4. The electrostatic charge image developing toner according to claim 1 ,
wherein a Net intensity N Cl of Cl, which is measured by fluorescent X-ray analysis, in the toner particle is 0.05 kcps or more and 1.00 kcps or less.

5. The electrostatic charge image developing toner according to claim 4 ,
wherein the Net intensity N Cl of Cl is 0.10 kcps or more and 0.80 kcps or less.

6. The electrostatic charge image developing toner according to claim 4 ,
wherein a ratio (N A /N Cl ) of the total Net intensity N A of the alkali metal and the alkaline earth metal to the Net intensity N Cl of Cl is 3 or more and 50 or less.

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

8. The electrostatic charge image developing toner according to claim 1 ,
wherein the alkali metal and the alkaline earth metal contain at least one selected from the group consisting of Na and Ca.

9. The electrostatic charge image developing toner according to claim 1 ,
wherein the amorphous resin contains an amorphous polyester resin and the crystalline resin contains a crystalline polyester resin.

10. The electrostatic charge image developing toner according to claim 1 ,
wherein the amorphous resin contains a styrene acrylic resin.

11. The electrostatic charge image developing toner according to claim 1 ,
wherein the amorphous resin contains a polyester resin segment and a styrene acrylic resin segment, and the crystalline resin contains a crystalline polyester resin.

12. The electrostatic charge image developing toner according to claim 1 ,
wherein the toner particle contains C. I. Pigment Yellow 185 as the pigment having an isoindoline skeleton.

13. The electrostatic charge image developing toner according to claim 1 ,
wherein the toner particle contains, as a release agent, an ester compound of a higher fatty acid having 10 to 25 carbon atoms and a monohydric or polyhydric alcohol.

14. The electrostatic charge image developing toner according to claim 1 ,
wherein the toner particle contains a release agent, and
in a case where the cross section of the toner particle is observed, a domain of the release agent is present inside the toner particle at a depth of 50 nm or more from the surface of the toner particle.

15. The electrostatic charge image developing toner according to claim 1 ,
wherein a content of the toner particle is 40% by number or more with respect to all toner particles in the toner.

16. The electrostatic charge image developing toner according to claim 15 ,
wherein the content of the toner particles is 70% by number or more with respect to all the toner particles in the toner.

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

Assignees

• Fujifilm Business Innovation Corp

Inventors

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

Classifications

• G03G9/08755

  Polyesters · CPC title

• G03G9/09733

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

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/0825

  characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093) · CPC title

• G03G9/0924 Primary

  Dyes characterised by specific substituents · CPC title