# US 10,310,398 B2 · Positively chargeable toner

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- Number: US 10,310,398 B2
- Document ID: US10310398B2
- Status: Granted
- Kind: B2
- Application number: 16/117,913
- Filed: 2018-08-30
- Published: 2019-03-07
- Granted: 2019-06-04
- Earliest claimed: 2017-09-05
- Assignees: KYOCERA Document Solutions Inc.
- Applicants: KYOCERA Document Solutions Inc.
- Inventors: Masanori Sugahara
- Web page: https://patentgrep.com/patent/US10310398B2

## CPC

- G03G 9/08755: {Polyesters}
- G03G 9/08782: {Waxes}
- G03G 9/09733: {Organic compounds (G03G9/08782 takes precedence)}
- G03G 9/09741: {cationic}
- G03G 9/09758: {comprising a heterocyclic ring}
- G03G 9/09775: {containing atoms other than carbon, hydrogen or oxygen (G03G9/09741 - G03G9/09766 take precedence)}
- G03G 9/0904: {Carbon black}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A positively chargeable toner includes a plurality of toner particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The toner mother particle contains a binder resin and a wax. The external additive includes a plurality of antioxidant particles. Each of the antioxidant particles includes a base particle containing an antioxidant and having a surface treated with a surface treatment agent. The surface treatment agent has a first functional group and a second functional group in a molecule thereof. The first functional group has stronger positive chargeability than the base particle. The second functional group has stronger hydrophobicity than the base particle.

## Claims

### Claim 1

A positively chargeable toner comprising a plurality of toner particles, wherein
the toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle, the toner mother particle containing a binder resin and a wax,
the external additive includes a plurality of antioxidant particles,
each of the antioxidant particles includes a base particle containing an antioxidant and having a surface treated with a surface treatment agent,
the surface treatment agent has a first functional group and a second functional group in a molecule thereof,
the first functional group has stronger positive chargeability than the base particle, and
the second functional group has stronger hydrophobicity than the base particle.

### Claim 2 (depends on 1)

The positively chargeable toner according to claim 1, wherein
the surface of the base particle of each of the antioxidant particles is chemically modified with the surface treatment agent, and
a modification group chemically modifying the surface of the base particle includes the first functional group and the second functional group.

### Claim 3 (depends on 2)

The positively chargeable toner according to claim 2, wherein
the surface treatment agent is an alkoxysilane having an amino group in a molecule thereof or a reactive silicone oil having an amino group in a molecule thereof,
the modification group further includes a siloxane bond,
a silicon atom included in the siloxane bond is directly or indirectly bonded to an atom constituting the base particle,
the first functional group is an amino group directly or indirectly bonded to the silicon atom, and
the second functional group is a hydrocarbon group optionally substituted with a substituent and directly or indirectly bonded to the silicon atom.

### Claim 4 (depends on 1)

The positively chargeable toner according to claim 1, wherein
in the base particle of each of the antioxidant particles, the surface treatment agent is attached to the surface of the base particle by physical force.

### Claim 5 (depends on 4)

The positively chargeable toner according to claim 4, wherein
the surface treatment agent is an alkoxysilane having an amino group in a molecule thereof or a reactive silicone oil having an amino group in a molecule thereof.

### Claim 6 (depends on 2)

The positively chargeable toner according to claim 2, wherein
the antioxidant contained in the base particle is a phenol antioxidant or a phosphite antioxidant.

### Claim 7 (depends on 4)

The positively chargeable toner according to claim 4, wherein
the antioxidant contained in the base particle is an amine antioxidant.

### Claim 8 (depends on 1)

The positively chargeable toner according to claim 1, wherein
the toner mother particle further contains an antioxidant.

### Claim 9 (depends on 3)

The positively chargeable toner according to claim 3, wherein
the alkoxysilane having the amino group in the molecule thereof is represented by a formula (1-1) shown below,
where in the formula (1-1), R11 and R12 each represent a hydrogen atom, R13 represents a propylene group, and R14, R15, and R16 each represent an ethyl group.

### Claim 10 (depends on 3)

The positively chargeable toner according to claim 3, wherein
the reactive silicone oil having the amino group in the molecule thereof is represented by a formula (1-2) shown below,
where in the formula (1-2), each of R21 to R29 represents a methyl group, n21 and n22 each represent, independently of each other, an integer of at least 1, and L represents a divalent organic group.