# US 2017/0285504 A1 · Electrostatic charge image developer, developer cartridge, and process cartridge

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- Number: US 2017/0285504 A1
- Document ID: US20170285504A1
- Status: Published application
- Kind: A1
- Application number: 15/223,810
- Filed: 2016-07-29
- Published: 2017-10-05
- Earliest claimed: 2016-03-29
- Assignees: Fuji Xerox Co., Ltd.
- Applicants: Fuji Xerox Co., Ltd.
- Inventors: Shintaro ANNO; Motoko SAKAI; Takuro WATANABE; Shuji SATO
- Web page: https://patentgrep.com/patent/US20170285504A1

## CPC

- G03G 9/1136: {containing silicon atoms}
- G03G 9/0819: {characterised by the dimensions of the particles}
- G03G 9/0823: {Electric parameters}
- G03G 9/0827: {characterised by their shape, e.g. degree of sphericity}
- G03G 9/0902: {Inorganic compounds}
- G03G 9/0926: {characterised by physical or chemical properties}
- G03G 15/08: using a solid developer, e.g. powder developer
- G03G 15/0865: {Arrangements for supplying new developer}
- G03G 2215/0607: two-component
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An electrostatic charge image developer includes a toner that includes a toner particle; and a carrier, wherein the toner particle contains a brilliant pigment, an exposed amount of the brilliant pigment contained in the toner particle is from 0.5% to 5%, the carrier has a core particle and a coating layer which covers a surface of the core particle, the coating layer contains a silicone resin and a siloxane oligomer, and a content of the siloxane oligomer is from 0.1 ppm to 500 ppm with respect to a total weight of the coating layer.

## Claims

### Claim 1

An electrostatic charge image developer comprising:
a toner that includes a toner particle; and
a carrier,
wherein the toner particle contains a brilliant pigment,
an exposed amount of the brilliant pigment contained in the toner particle is from 0.5% to 5%,
the carrier has a core particle and a coating layer which covers a surface of the core particle,
the coating layer contains a silicone resin and a siloxane oligomer, and
a content of the siloxane oligomer is from 0.1 ppm to 500 ppm with respect to a total weight of the coating layer.

### Claim 2 (depends on 1)

The electrostatic charge image developer according to claim 1,
wherein an exposed amount of the brilliant pigment is from 0.8% to 4.5%.

### Claim 3 (depends on 1)

The electrostatic charge image developer according to claim 1,
wherein a weight-average molecular weight of the siloxane oligomer is 300 or more and less than 5,000.

### Claim 4 (depends on 1)

The electrostatic charge image developer according to claim 1,
wherein a content of the siloxane oligomer is from 1 ppm to 450 ppm with respect to a total weight of the coating layer.

### Claim 5 (depends on 1)

The electrostatic charge image developer according to claim 1,
wherein an exposed amount of the brilliant pigment is from 1% to 4%.

### Claim 6 (depends on 1)

The electrostatic charge image developer according to claim 1,
wherein a ratio (C/D) between a number-average maximum thickness C and a number-average equivalent circle diameter D of the toner particles is 0.1 or more and less than 0.7.

### Claim 7 (depends on 1)

The electrostatic charge image developer according to claim 1,
wherein a ratio (C/D) between the number-average maximum thickness C and the number-average equivalent circle diameter D of the toner particles is from 0.7 to 1.2.

### Claim 8 (depends on 1)

The electrostatic charge image developer according to claim 1,
wherein a ratio between an exposed amount of the brilliant pigment and an amount of the siloxane oligomer is from 1:500 to 10:1.

### Claim 9 (depends on 1)

The electrostatic charge image developer according to claim 1,
wherein a volume intrinsic resistance R1 at 100 V and a volume intrinsic resistance R2 at 500 V of the core particles satisfy the following Equation 1:
0.8≦R2/R1≦1.0. Equation 1

### Claim 10 (depends on 1)

A developer cartridge comprising:
a container that contains the electrostatic charge image developer according to claim 1,
wherein the developer cartridge is detachable from an image forming apparatus.

### Claim 11 (depends on 1)

A process cartridge comprising:
a container that contain the electrostatic charge image developer according to claim 1, and
a developer holding member that holds the electrostatic charge image developer,
wherein the process cartridge is detachable from an image forming apparatus.