# US 10,481,513 B2 · Toner for electrostatic charge development

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- Number: US 10,481,513 B2
- Document ID: US10481513B2
- Status: Granted
- Kind: B2
- Application number: 16/241,353
- Filed: 2019-01-07
- Published: 2019-07-11
- Granted: 2019-11-19
- Earliest claimed: 2018-01-10
- Assignees: Konica Minolta, Inc.
- Applicants: Konica Minolta, Inc.
- Inventors: Kenshi Miyajima; Kouji Sugama
- Web page: https://patentgrep.com/patent/US10481513B2

## CPC

- G03G 9/0819: {characterised by the dimensions of the particles}
- G03G 9/0808: {by dry mixing the toner components in solid or softened state}
- G03G 9/0817: {Separation; Classifying}
- G03G 9/0821: {characterised by physical parameters (magnetic parameters G03G9/083)}
- G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature}
- G03G 9/097: Plasticisers; Charge controlling agents
- G03G 9/09708: {Inorganic compounds}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

The toner for electrostatic charge development includes a toner particle including: a toner base particle containing a binder resin and a release agent; and an external additive containing titanium dioxide. The number fraction of the toner particle containing the titanium dioxide is 0.1% or more and 2.0% or less.

## Claims

### Claim 1

A toner for electrostatic charge development, comprising a toner particle, the toner particle comprising: a toner base particle containing a binder resin and a release agent; and an external additive containing titanium dioxide, wherein
the number fraction of the toner particle containing the titanium dioxide is 0.1% or more and 2.0% or less.

### Claim 2 (depends on 1)

The toner for electrostatic charge development according to claim 1, wherein the number fraction of the toner particle containing the titanium dioxide is 0.3% or more and 1.0% or less.

### Claim 3 (depends on 1)

The toner for electrostatic charge development according to claim 1, wherein the content of titanium element derived from the titanium dioxide on average per toner particle is 0.01 mass % or more and 1.00 mass % or less.

### Claim 4 (depends on 1)

The toner for electrostatic charge development according to claim 1, wherein the content of titanium element derived from the titanium dioxide on average per toner particle is 0.04 mass % or more and 0.50 mass % or less.