# US 12,216,432 B2 · Toner

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- Number: US 12,216,432 B2
- Document ID: US12216432B2
- Status: Granted
- Kind: B2
- Application number: 17/456,043
- Filed: 2021-11-22
- Published: 2022-05-26
- Granted: 2025-02-04
- Earliest claimed: 2020-11-26
- Assignees: KYOCERA Document Solutions Inc.
- Applicants: KYOCERA Document Solutions Inc.
- Inventors: Haruhiro Hatajiri
- Web page: https://patentgrep.com/patent/US12216432B2

## CPC

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

## Abstract

A toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to the surface of the toner mother particle. The external additive includes specific resin particles. The specific resin particles contains a specific resin having an alkoxysilyl group. The specific resin may include a first repeating unit derived from a specific monomer having the alkoxysilyl group and a (meth)acryloyl group.

## Claims

### Claim 1

A toner comprising 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 external additive includes resin particles,
the resin particles contain a resin having an alkoxysilyl group,
the resin includes a first repeating unit derived from a monomer having the alkoxysilyl group and a (meth)acryloyl group,
the first repeating unit has a percentage content of at least 10% by mass and no greater than 35% by mass relative to all repeating units in the resin, and
the resin includes a third repeating unit derived from a cross-linking agent.

### Claim 2 (depends on 1)

The toner according to claim 1, wherein
the alkoxysilyl group is a trimethoxysilyl group or a methyldimethoxysilyl group.

### Claim 3 (depends on 1)

The toner according to claim 1, wherein
the resin includes a second repeating unit derived from at least one compound selected from the group consisting of (meth)acrylic acid alkyl ester and styrene.