# US 11,112,714 B2 · Toner

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- Number: US 11,112,714 B2
- Document ID: US11112714B2
- Status: Granted
- Kind: B2
- Application number: 16/808,782
- Filed: 2020-03-04
- Published: 2020-09-17
- Granted: 2021-09-07
- Earliest claimed: 2019-03-14
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Shota Amano; Shintaro Kawaguchi; Kenichi Nakayama
- Web page: https://patentgrep.com/patent/US11112714B2

## CPC

- G03G 9/09725: {Silicon-oxides; Silicates}
- G03G 9/09708: {Inorganic compounds}
- G03G 9/09716: {treated with organic compounds}
- G03G 9/10: characterised by carrier particles
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A toner comprising: a toner particle; and an external additive, wherein the external additive includes spherical silica particles and hydrotalcite particles, a number average particle diameter Da of the spherical silica particles is from 10 nm to 40 nm, a circularity of the spherical silica particles is at least 0.80, and the toner satisfies formula (1) below: {Ga×(1−Ka/100)}/{Gb×(1−Kb/100)}≥0.050 (1) wherein Ga: a content of the spherical silica particles with respect to 100 parts by mass of the toner particle; Gb: a content of the hydrotalcite particles with respect to 100 parts by mass of the toner particle; Ka: a fixing ratio (%) of the spherical silica particles on a surface of the toner particle; and Kb: a fixing ratio (%) of the hydrotalcite particles on the surface of the toner particle.

## Claims

### Claim 1

A toner, comprising:
a toner particle; and
an external additive comprising spherical silica particles having a circularity of at least 0.80 and hydrotalcite particles, wherein
a ratio Db/Da of a number average particle diameter Db (nm) of the hydrotalcite particles to a number average particle diameter Da (nm) of the spherical silica particles is 7.5 to 30.0,
the number average particle diameter Da (nm) of the spherical silica particles is 10 to 40, and
{Ga×(1−Ka/100)}/{Gb×(1−Kb/100))≥0.050
where Ga is a content of the spherical silica particles with respect to 100 parts by mass of the toner particle, Gb is a content of the hydrotalcite particles with respect to 100 parts by mass of the toner particle, Ka is a fixing ratio (%) of the spherical silica particles on a surface of the toner particle and Kb is a fixing ratio (%) of the hydrotalcite particles on the surface of the toner particle.

### Claim 2 (depends on 1)

The toner according to claim 1, wherein
6.000≥{Ga×(1−Ka/100)}/(Gb×(1−Kb/100)}≥0.050.

### Claim 3 (depends on 1)

The toner according to claim 1, wherein Ka is 60 to 95.

### Claim 4 (depends on 1)

The toner according to claim 1, wherein Kb is 15 to 70.

### Claim 5 (depends on 1)

The toner according to claim 1, wherein Db is 100 to 1000 nm.

### Claim 6 (depends on 1)

The toner according to claim 1, wherein the content of the spherical silica particles is 0.10 to 5.00 parts by mass with respect to 100 parts by mass of the toner particle.

### Claim 7 (depends on 1)

The toner according to claim 1, wherein the content of the hydrotalcite particles is 0.05 to 1.00 parts by mass with respect to 100 parts by mass of the toner particle.

### Claim 8 (depends on 1)

The toner according to claim 1, wherein the toner particle is an emulsion aggregation toner particle.

### Claim 9 (depends on 1)

The toner according to claim 1, wherein the spherical silica particles are sol-gel silica particles.