# US 12,282,292 B2 · Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge

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- Number: US 12,282,292 B2
- Document ID: US12282292B2
- Status: Granted
- Kind: B2
- Application number: 17/575,608
- Filed: 2022-01-13
- Published: 2023-03-30
- Granted: 2025-04-22
- Earliest claimed: 2021-09-24
- Assignees: FUJIFILM Business Innovation Corp.
- Applicants: FUJIFILM Business Innovation Corp.
- Inventors: Atsushi Sugawara; Yoshimasa Fujihara; Kazutsuna Sasaki; Takashi Inukai
- Web page: https://patentgrep.com/patent/US12282292B2

## CPC

- G03G 9/0819: {characterised by the dimensions of the particles}
- G03G 9/0825: {characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093)}
- G03G 9/0827: {characterised by their shape, e.g. degree of sphericity}
- G03G 9/08711: {with esters of acrylic or methacrylic acid}
- G03G 9/08755: {Polyesters}
- G03G 9/08782: {Waxes}
- G03G 9/08788: {Block polymers}
- G03G 9/08795: {characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants}
- G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature}
- G03G 9/09708: {Inorganic compounds}
- G03G 15/0822: {Arrangements for preparing, mixing, supplying or dispensing developer}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An electrostatic charge image developing toner includes a toner particle containing a binder resin, a release agent, a divalent metal, and a trivalent metal, in which the release agent has a domain diameter of 0.5 μm or greater and 1.5 μm or less.

## Claims

### Claim 1

An electrostatic charge image developing toner comprising:
a toner particle containing a binder resin, a release agent, a divalent metal, and a trivalent metal,
wherein the release agent has a domain diameter of 0.5 μm or greater and 1.5 μm or less, the trivalent metal is aluminum (Al), and a content of the trivalent metal with respect to a mass of the toner particle is 0.5 mmol/kg or greater and 50 mmol/kg or less.

### Claim 2

An electrostatic charge image developing toner comprising:
a toner particle containing a binder resin, a release agent, a divalent metal, and a trivalent metal,
wherein a ratio of a domain diameter of the release agent to a maximum diameter of the toner particle is 10% or greater and 30% or less, the trivalent metal is Al, and a content of the trivalent metal with respect to a mass of the toner particle is 0.5 mmol/kg or greater and 50 mmol/kg or less.

### Claim 3 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein a content of the divalent metal with respect to the mass of the toner particle is 0.5 mmol/kg or greater and 50 mmol/kg or less.

### Claim 4 (depends on 3)

The electrostatic charge image developing toner according to claim 3,
wherein a ratio (content mol number of divalent metal/content mol number of trivalent metal) of the content of the divalent metal to the content of the trivalent metal is 0.3 or greater and 10 or less.

### Claim 5 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein 50% or greater of the trivalent metal in terms of mol number is present in a region of the toner particle to a depth of 300 nm from a surface, and
60% or greater of the divalent metal in terms of mol number is present in a region from the center of the toner particle core to the depth of 300 nm from the surface.

### Claim 6 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein a gel fraction of the binder resin in the toner particle is 1% by mass or greater and 10% by mass or less.

### Claim 7 (depends on 6)

The electrostatic charge image developing toner according to claim 6,
wherein a content of the divalent metal with respect to a mass of a gel content of the binder resin is 10 mmol/kg or greater and 50 mmol/kg or less, and
a content of the trivalent metal with respect to the mass of the gel content of the binder resin is 20 mmol/kg or greater and 150 mmol/kg or less.

### Claim 8 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein the divalent metal is at least one selected from the group consisting of Ca and Mg.

### Claim 9 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein a melting temperature of the release agent is 65° C. or higher and 85° C. or lower.

### Claim 10 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein a circularity of a domain of the release agent is 0.9 or greater and 1.0 or less.

### Claim 11 (depends on 10)

The electrostatic charge image developing toner according to claim 10,
wherein the release agent is an ester-based wax.

### Claim 12 (depends on 1)

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

### Claim 13 (depends on 1)

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