# US 2020/0401059 A1 · Toner

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2020/0401059 A1
- Document ID: US20200401059A1
- Status: Published application
- Kind: A1
- Application number: 16/906,928
- Filed: 2020-06-19
- Published: 2020-12-24
- Earliest claimed: 2019-06-21
- Assignees: KYOCERA Document Solutions Inc.
- Applicants: KYOCERA Document Solutions Inc.
- Inventors: Masami TSUJIHIRO; Ken MAETANI
- Web page: https://patentgrep.com/patent/US20200401059A1

## CPC

- G03G 9/08788: {Block polymers}
- G03G 9/0837: {Structural characteristics of the magnetic components, e.g. shape, crystallographic structure}
- G03G 9/08728: {Polymers of esters}
- G03G 9/08755: {Polyesters}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A toner includes toner particles. The toner particles each include a toner mother particle. The toner mother particles contain a binder resin and a magnetic powder. The binder resin includes a polyester resin, a vinyl resin, and a block polymer. The block polymer includes a polyester portion, a vinyl polymer portion, and a linker that links the polyester portion and the vinyl polymer portion. The linker is derived from a specific compound having a vinyl group and at least one of a carboxy group and an alcoholic hydroxyl group. The magnetic powder has an octahedral structure.

## Claims

### Claim 1

A toner comprising toner particles, wherein
the toner particles each include a toner mother particle,
the toner mother particles contain a binder resin and a magnetic powder,
the binder resin includes a polyester resin, a vinyl resin, and a block polymer,
the block polymer includes a polyester portion, a vinyl polymer portion, and a linker that links the polyester portion and the vinyl polymer portion,
the linker is derived from a specific compound having a vinyl group and at least one of a carboxy group and an alcoholic hydroxyl group, and
the magnetic powder has an octahedral structure.

### Claim 2 (depends on 1)

The toner according to claim 1, wherein
a percentage of a total mass of the vinyl resin and the vinyl polymer portion in the block polymer relative to a mass of the binder resin is at least 0.5% by mass and no greater than 25.0% by mass.

### Claim 3 (depends on 1)

The toner according to claim 1, wherein
the binder resin has an acid value of at least 10.0 mgKOH/g and no greater than 30.0 mgKOH/g.

### Claim 4 (depends on 1)

The toner according to claim 1, wherein
the specific compound includes at least one of (meth)acrylic acid and a (meth)acrylic acid hydroxyalkyl ester.