# US 2019/0317418 A1 · Toner, two-component developer, and method for producing toner

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- Number: US 2019/0317418 A1
- Document ID: US20190317418A1
- Status: Published application
- Kind: A1
- Application number: 16/368,303
- Filed: 2019-03-28
- Published: 2019-10-17
- Earliest claimed: 2018-04-12
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: KEIICHI KIKAWA; YORITAKA TSUBAKI; TAKESHI KATOH; OSAMU WADA; TADANORI KANO; YUYA KONDO; SHOJI NAKAI; HIROKI MAEDA
- Web page: https://patentgrep.com/patent/US20190317418A1

## CPC

- G03G 9/08755: {Polyesters}
- G03G 9/081: {by mixing the toner components in a liquefied state; melt kneading; reactive mixing}
- G03G 9/08782: {Waxes}
- 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 9/09733: {Organic compounds (G03G9/08782 takes precedence)}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A toner contains at least a crystalline polyester resin and an amorphous linear polyester resin that uses diethylene glycol as an alcohol component, and a monoester wax and a montan ester wax as release agent components, wherein 6≤α≤8 and 14≤mw/α<30 are satisfied, where α represents an amount of the crystalline polyester resin added relative to 100 parts by weight of the amorphous linear polyester resin and mw represents an amount of the montan ester wax added.

## Claims

### Claim 1

A toner comprising:
at least a crystalline polyester resin and an amorphous linear polyester resin that uses diethylene glycol as an alcohol component; and
a monoester wax and a montan ester wax as release agent components,
wherein 6≤α8 and 14<mw/α<30 are satisfied, where α represents an amount of the crystalline polyester resin added relative to 100 parts by weight of the amorphous linear polyester resin and mw represents an amount of the montan ester wax added.

### Claim 2 (depends on 1)

The toner according to claim 1, further comprising a pigment,
wherein a part or all of the montan ester wax is used as a pigment dispersant.

### Claim 3 (depends on 1)

The toner according to claim 1, wherein when an inflection point given when a horizontal axis shows a molecular weight in a logarithmic scale and a vertical axis shows a molecular weight distribution of the toner in terms of percentage by height is referred to as a shoulder, the shoulder is present in a region of 100,000≤Mw<300,000, where Mw represents a weight-average molecular weight of the molecular weight distribution.

### Claim 4 (depends on 1)

A two-component developer comprising:
the toner according to claim 1; and
a carrier.

### Claim 5

A method for producing a toner, comprising:
mixing raw materials including a pigment master batch under stirring to obtain a mixed product;
melt-kneading the mixed product to obtain a melt-kneaded product;
cooling and then roughly pulverizing the melt-kneaded product to obtain a roughly pulverized product;
finely pulverizing the roughly pulverized product to obtain a finely pulverized product;
classifying the finely pulverized product to obtain a toner base particle; and
adding an external additive to the toner base particle and performing stirring.