# US 10,768,543 B2 · Toner

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- Number: US 10,768,543 B2
- Document ID: US10768543B2
- Status: Granted
- Kind: B2
- Application number: 16/550,418
- Filed: 2019-08-26
- Published: 2020-03-05
- Granted: 2020-09-08
- Earliest claimed: 2018-08-28
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Daisuke Tsujimoto; Toru Takahashi; Hiroki Watanabe; Yoshihiro Ogawa; Wakashi Iida
- Web page: https://patentgrep.com/patent/US10768543B2

## CPC

- G03G 9/09716: {treated with organic compounds}
- G03G 9/0819: {characterised by the dimensions of the particles}
- G03G 9/08755: {Polyesters}
- G03G 9/08791: {characterised by the presence of specified groups or side chains}
- G03G 9/09708: {Inorganic compounds}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A toner having a toner particle, which contains a binder resin, and inorganic fine particles, the toner being characterized in that the binder resin contains a polyester resin, the polyester resin has, at a terminal, an alkyl group having an average number of carbon atoms of from 4 to 102, the number average particle diameter of primary particles of the inorganic fine particles is from 10 to 90 nm, the dielectric constant of the inorganic fine particles is from 55.0 to 100.0 pF/m, as measured at 25° C. and 1 MHz, and the inorganic fine particles are surface-treated with an alkylalkoxysilane represented by formula (1) below: CnH2n+1—SiOCmH2m+1)3 (1) in formula (1), n denotes an integer of from 4 to 20, and m denotes an integer of from 1 to 3.

## Claims

### Claim 1

A toner having
a toner particle which contains a binder resin, and
inorganic fine particles, wherein
the binder resin contains a polyester resin,
the polyester resin has, at a terminal, an alkyl group having an average number of carbon atoms of from 4 to 102,
a number average particle diameter of primary particles of the inorganic fine particles is from 10 to 90 nm,
a dielectric constant of the inorganic fine particles is from 55.0 to 100.0 pF/m, as measured at 25° C. and 1 MHz, and
the inorganic fine particles are surface-treated with an alkylalkoxysilane represented by the following formula (1):
CnH2n+1—SiOCmH2m+1)3 (1)
wherein, n denotes an integer of from 4 to 20, and m denotes an integer of from 1 to 3.

### Claim 2 (depends on 1)

The toner according to claim 1, wherein the inorganic fine particles are contained in an amount of from 0.1 to 15.0 parts by mass relative to 100 parts by mass of the toner particle.

### Claim 3 (depends on 1)

The toner according to claim 1, wherein the inorganic fine particles have a crystal structure, the crystal structure being a perovskite structure.

### Claim 4 (depends on 1)

The toner according to claim 1, wherein the inorganic fine particles are strontium titanate particles.

### Claim 5 (depends on 1)

The toner according to claim 1, wherein
in a number-based particle size distribution of the inorganic fine particles at the surface of the toner particle,
when D10 denotes a particle diameter at which a cumulative value from the small particle diameter side reaches 10 number %, and
D90 denotes a particle diameter at which a cumulative value from the small particle diameter side reaches 90 number %,
a particle size distribution index A, which is expressed by the ratio of D90 to D10 (D90/D10), is from 2.00 to 10.00.