# US 8,785,101 B2 · Toner

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

- Number: US 8,785,101 B2
- Document ID: US8785101B2
- Status: Granted
- Kind: B2
- Application number: 13/741,356
- Filed: 2013-01-14
- Published: 2013-05-23
- Granted: 2014-07-22
- Earliest claimed: 2011-06-03
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Takaaki Kaya; Tetsuya Kinumatsu; Toshifumi Mori; Ayako Okamoto; Kenji Aoki; Shuntaro Watanabe; Atsushi Tani; Takashige Kasuya
- Web page: https://patentgrep.com/patent/US8785101B2

## CPC

- G03G 9/08764: {Polyureas; Polyurethanes}
- G03G 9/0802: {Preparation methods}
- G03G 9/0804: {whereby the components are brought together in a liquid dispersing medium}
- G03G 9/0821: {characterised by physical parameters (magnetic parameters G03G9/083)}
- G03G 9/08755: {Polyesters}
- G03G 9/08782: {Waxes}
- G03G 9/08788: {Block polymers}
- G03G 9/08795: {characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants}
- G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

Provided is a toner containing toner particles, each of which includes a binder resin containing a polyester as a main component, a colorant, and a wax, in which the binder resin includes a block polymer in which a segment capable of forming a crystalline structure and a segment incapable of forming a crystalline structure are bonded, the toner has a maximum endothermic peak from the binder resin, as determined by differential scanning calorimetry measurement, with a peak temperature in a specific range and with an endothermic quantity in a specific range, and the wax is an ester wax having a functionality of 3 or more.

## Claims

### Claim 1

A toner comprising toner particles, each of which comprises
a binder resin containing a polyester as a main component,
a colorant, and
a wax,
wherein:
the binder resin comprises a block polymer in which
a segment capable of forming a crystalline structure and a segment incapable of forming a crystalline structure are bonded,
in measurement of the toner with a differential scanning calorimetry (DSC), a peak temperature of a maximum endothermic peak derived from the binder resin is at least 50° C. and not more than 80° C., and an endothermic quantity of the maximum endothermic peak is at least 30 J/g and not more than 100 J/g; and
wherein:
the wax is an ester wax having 3 or more ester bonds as functional groups.

### Claim 2 (depends on 1)

The toner according to claim 1, wherein a peak temperature of a maximum endothermic peak of the wax is 65° C. or more in measurement of the wax with a differential scanning calorimetry (DSC), and the wax has a saponification value of 160 mgKOH/g or more.

### Claim 3 (depends on 1)

The toner according to claim 1, wherein the wax has a molecular weight of at least 1,500 and not more than 2,200.

### Claim 4 (depends on 1)

The toner according to claim 1, wherein the wax is an ester wax having 6 or more ester bonds as functional groups.

### Claim 5 (depends on 1)

The toner according to claim 1, wherein a content of the wax with respect to 100 parts by mass of the binder resin is at least 2.0 parts by mass and not more than 8.0 parts by mass.

### Claim 6 (depends on 1)

The toner according to claim 1, wherein the segment capable of forming a crystalline structure in the block polymer is a crystalline polyester obtained by reacting an aliphatic dicarboxylic acid with an aliphatic diol.

### Claim 7 (depends on 1)

The toner according to claim 1, wherein the segment incapable of forming a crystalline structure in the block polymer is a polyurethane obtained by reacting a diol with a diisocyanate.

### Claim 8 (depends on 1)

The toner according to claim 1, wherein the block polymer contains, based on the total amount of the binder resin, at least 50 mass % and not more than 85 mass % of the segment capable of forming a crystalline structure.

### Claim 9 (depends on 1)

The toner according to claim 1, wherein the toner particles are produced by a process comprising the steps of:
(i) preparing a dissolved material or dispersed material by dissolving or dispersing the binder resin, the colorant and the wax in an organic solvent;
(ii) preparing a dispersion by dispersing the dissolved material or the dispersed material in a dispersion medium containing carbon dioxide in a supercritical state or a liquid state where resin fine particles have been dispersed; and
(iii) forming toner particles by removing the organic solvent from the dispersion.