Toner, toner stored unit, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-10025213-B2
Application number	US-201615557362-A
Country	US
Kind code	B2
Filing date	Feb 29, 2016
Priority date	Mar 13, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A toner including a binder resin, wherein the toner includes a tetrahydrofuran (THF)-insoluble component in a range of from 10% by mass through 40% by mass, wherein the toner has a main peak in a range of from 12,000 through 18,000 in a molecular weight distribution of a THF-soluble component as measured by gel permeation chromatography (GPC), wherein the main peak has a half value width in a range of from 20,000 to 50,000, and wherein the toner includes a component having a molecular weight of 2,000 or less in a range of from 10.0% by mass through 20.0% by mass and a component having a molecular weight of 100,000 or more of 8.0% by mass or less.

First claim

The invention claimed is:

1. A toner, comprising,
a binder resin,
wherein:
the toner comprises a tetrahydrofuran (THF)-insoluble component in a range of from 10% by mass through 40% by mass;
the toner has a main peak in a range of from 12,000 through 18,000 in a molecular weight distribution of a THF-soluble component as measured by gel permeation chromatography (GPC);
the main peak has a half value width in a range of from 20,000 to 50,000; and
the toner comprises a component having a molecular weight of 2,000 or less in a range of from 10.0% by mass through 20.0% by mass and a component having a molecular weight of 100,000 or more of 8.0% by mass or less.

2. The toner according to claim 1 , wherein:
the toner has the main peak in a range of from 15,000 through 18,000 in the molecular weight distribution; and
the main peak has the half value width in a range of from 35,000 to 50,000.

3. The toner according to claim 1 , wherein the toner is a toner for one-component development.

4. A toner stored unit, comprising the toner of claim 1 stored in a container, device or cartridge.

5. An image forming apparatus, comprising:
an electrostatic latent image bearer;
an electrostatic latent image forming unit configured to form an electrostatic latent image on the electrostatic latent image bearer;
a developing unit containing a developing agent and configured to develop the electrostatic latent image with the developing agent to form a visible image;
a transfer unit configured to transfer the visible image onto a recording medium to form a transferred image on the recording medium; and
a fixing unit configured to fix the transferred image on the recording medium,
wherein the developing agent comprises the toner of claim 1 .

Assignees

• Seki Masahiro
• Sekiguchi Yoshitaka
• Ogawa Satoshi
• Kitada Naoko
• Ricoh Co Ltd

Inventors

• Seki Masahiro
• Sekiguchi Yoshitaka
• Ogawa Satoshi
• Kitada Naoko

Classifications

• G03G9/08755

  Polyesters · CPC title

• G03G9/08782

  Waxes · CPC title

• G03G9/091

  Azo dyes · CPC title

• G03G9/08797 Primary

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• G03G9/08795

  characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants · CPC title