# US 2014/0193750 A1 · Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge

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- Number: US 2014/0193750 A1
- Document ID: US20140193750A1
- Status: Published application
- Kind: A1
- Application number: 14/048,718
- Filed: 2013-10-08
- Published: 2014-07-10
- Earliest claimed: 2013-01-10
- Assignees: Fuji Xerox Co., Ltd.
- Applicants: Fuji Xerox Co., Ltd.
- Inventors: Noriyuki MIZUTANI; Tsuyoshi MURAKAMI; Yukiaki NAKAMURA; Satoshi KAMIWAKI
- Web page: https://patentgrep.com/patent/US20140193750A1

## CPC

- G03G 9/08755: {Polyesters}
- G03G 9/0819: {characterised by the dimensions of the particles}
- G03G 9/0827: {characterised by their shape, e.g. degree of sphericity}
- G03G 9/08782: {Waxes}
- G03G 9/09733: {Organic compounds (G03G9/08782 takes precedence)}
- G03G 9/09741: {cationic}
- G03G 9/09775: {containing atoms other than carbon, hydrogen or oxygen (G03G9/09741 - G03G9/09766 take precedence)}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An electrostatic charge image developing toner includes toner particles; and an external additive that is externally added to surfaces of the toner particles, in which a content of nitrogen atoms on the surfaces of the toner particles is from 0-8 atomic % to 5.0 atomic % and a content of nitrogen atoms at a depth of 10 nm inside from the surfaces of the toner particles is 0.4 atomic % or less when measured by X-ray photoelectron spectroscopy.

## Claims

### Claim 1

An electrostatic charge image developing toner comprising:
toner particles; and
an external additive that is externally added to surfaces of the toner particles,
wherein a content of nitrogen atoms on the surfaces of the toner particles is from 0.8 atomic % to 5.0 atomic % and a content of nitrogen atoms at a depth of 10 nm inside from the surfaces of the toner particles is 0.4 atomic % or less when measured by X-ray photoelectron spectroscopy.

### Claim 2 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein an organic compound of which the weight fraction of nitrogen atoms is from 5% to 50% is provided on the surfaces of the toner particles.

### Claim 3 (depends on 2)

The electrostatic charge image developing toner according to claim 2,
wherein the organic compound is polyethyleneimine.

### Claim 4 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein the toner particles contain a hinder resin having a carbon-carbon double bond, and
the surfaces of the toner particles react with a nitrogen-containing polymerization initiator.

### Claim 5 (depends on 4)

The electrostatic charge image developing toner according to claim 4,
wherein the nitrogen-containing polymerization initiator is azobisisobutyronitrile.

### Claim 6 (depends on 4)

The electrostatic charge image developing toner according to claim 4,
wherein the binder resin contains a polyester resin.

### Claim 7 (depends on 6)

The electrostatic charge image developing toner according to claim 6,
wherein a glass transition temperature (Tg) of the polyester resin is from 50° C. to 80° C.

### Claim 8 (depends on 6)

The electrostatic charge image developing toner according to claim 6,
wherein a weight average molecular weight (Mw) of the polyester resin is from 5,000 to 1,000,000.

### Claim 9 (depends on 6)

The electrostatic charge image developing toner according to claim 6,
wherein a molecular weight distribution Mw/Mn of the polyester resin is from 1.5 to 100.

### Claim 10 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein the toner particles contain a colorant, and a content of the colorant is from 3% by weight to 15% by weight.

### Claim 11 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein the toner particles contain a release agent, and a melting temperature of the release agent is from 50° C. to 110° C.

### Claim 12 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein a volume average particle size (D50v) of the toner particles is from 2 μm to 10 μm.

### Claim 13 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein a shape factor SF1 of the toner particle is from 110 to 150.

### Claim 14 (depends on 1)

The electrostatic charge image developing toner according to claim 1,
wherein an amount of the external additive externally added is from 0.01% by weight to 5% by weight with respect to the toner particles.

### Claim 15 (depends on 1)

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

### Claim 16 (depends on 1)

A toner cartridge that accommodates the electrostatic charge image developing toner according to claim 1 and is detachable from an image forming apparatus.