# US 11,079,694 B2 · Toner for developing electrostatic charge image

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- Number: US 11,079,694 B2
- Document ID: US11079694B2
- Status: Granted
- Kind: B2
- Application number: 16/793,401
- Filed: 2020-02-18
- Published: 2020-09-17
- Granted: 2021-08-03
- Earliest claimed: 2019-03-11
- Assignees: Konica Minolta, Inc.
- Applicants: Konica Minolta, Inc.
- Inventors: Kenshi Miyajima; Shinya Obara; Ikuko Sakurada
- Web page: https://patentgrep.com/patent/US11079694B2

## CPC

- G03G 9/08755: {Polyesters}
- 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 9/08773: {Polymers having silicon in the main chain, with or without sulfur, oxygen, nitrogen or carbon only}
- G03G 9/09708: {Inorganic compounds}
- G03G 9/09725: {Silicon-oxides; Silicates}
- G03G 9/09775: {containing atoms other than carbon, hydrogen or oxygen (G03G9/09741 - G03G9/09766 take precedence)}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A toner for electrostatic charge image development is a toner for electrostatic charge image development including toner particles containing a binder resin and an external additive, wherein the binder resin contains a crystalline polyester resin and an amorphous polyester resin, the external additive includes Al—Si composite oxide particles, and a Si element content of the Al—Si composite oxide particles is in the range of 50 to 90 mass % and a Si element ratio on surfaces of the Al—Si composite oxide particles is in the range of 3 to 35 at %.

## Claims

### Claim 1

A toner for electrostatic charge image development comprising toner particles containing a binder resin and an external additive,
wherein the binder resin contains a crystalline polyester resin and an amorphous polyester resin,
the external additive includes Al—Si composite oxide particles, and
a Si element content of the Al—Si composite oxide particles is in the range of 50 to 90 mass % and a Si element ratio on surfaces of the Al—Si composite oxide particles is in the range of 3 to 35 at %.

### Claim 2 (depends on 1)

The toner for electrostatic charge image development according to claim 1,
wherein the Si element ratio on the surfaces of the Al—Si composite oxide particles is in the range of 5 to 15 at %.

### Claim 3 (depends on 1)

The toner for electrostatic charge image development according to claim 1,
wherein the Si element content of the Al—Si composite oxide particles is in the range of 60 to 80 mass %.

### Claim 4 (depends on 1)

The toner for electrostatic charge image development according to claim 1,
wherein a content of the crystalline polyester resin in the binder resin is in the range of 5 to 20 mass %.

### Claim 5 (depends on 1)

The toner for electrostatic charge image development according to claim 1,
wherein a content of the amorphous polyester resin in the binder resin is in the range of 30 to 80 mass %.

### Claim 6 (depends on 1)

The toner for electrostatic charge image development according to claim 1, wherein the Al—Si composite oxide particles are core-shell type particles each having a core and a shell layer on the core, the core and the shell layer are formed from an Al—Si composite oxide, and a ratio of Si and Al of the core is different from a ratio of Si and Al of the shell layer.