Toner, developer, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-9557672-B2
Application number	US-201414913606-A
Country	US
Kind code	B2
Filing date	Aug 13, 2014
Priority date	Sep 6, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A toner, including: a polyester resin, wherein the polyester resin includes a diol component and a crosslink component as constituent components thereof, wherein the diol component contains an aliphatic diol having 3 to 10 carbon atoms in an amount of 50 mol % or more, wherein the crosslink component contains a trihydric or higher aliphatic alcohol, and wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C., where the glass transition temperature (Tg1st) is measured in first heating in differential scanning calorimetry (DSC) of the toner.

First claim

The invention claimed is:

1. A toner, comprising:
a polyester resin,
wherein the polyester resin comprises a diol component and a crosslink component as constituent components thereof,
wherein the diol component comprises an aliphatic diol having 3 to 10 carbon atoms in an amount of 50 mol % or more,
wherein the crosslink component comprises a trihydric or higher aliphatic alcohol, and
wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C., where the glass transition temperature (Tg1st) is measured in first heating in differential scanning calorimetry (DSC) of the toner.

2. The toner according to claim 1 , wherein the crosslink component constituting the polyester resin is a trihydric or tetrahydric aliphatic alcohol.

3. The toner according to claim 1 , wherein the number of carbon atoms of a main chain of the diol component constituting the polyester resin is an odd number, and the diol component comprises an alkyl group in a side chain thereof.

4. The toner according to claim 1 , further comprising a crystalline polyester resin.

5. The toner according to claim 1 , wherein the polyester resin comprises a dicarboxylic acid component as the constituent component thereof, and the dicarboxylic acid component comprises an aliphatic dicarboxylic acid having 4 to 12 carbon atoms in an amount of 50 mol % or more.

6. The toner according to claim 1 , wherein the polyester resin comprises a urethane bond, a urea bond, or both.

7. The toner according to claim 1 , wherein the toner has a glass transition temperature (Tg2nd) of 0° C. to 30° C., where the glass transition temperature (Tg2nd) is measured in second heating in differential scanning calorimetry (DSC) of the toner, and the Tg1st is higher than the Tg2nd.

8. A developer, comprising:
a toner; and
a carrier,
wherein the toner comprises a polyester resin,
wherein the polyester resin comprises a diol component and a crosslink component as constituent components thereof,
wherein the diol component comprises an aliphatic diol having 3 to 10 carbon atoms in an amount of 50 mol % or more,
wherein the crosslink component comprises a trihydric or higher aliphatic alcohol, and
wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C., where the glass transition temperature (Tg1st) is measured in first heating in differential scanning calorimetry (DSC) of the toner.

9. An image forming apparatus, comprising:
an electrostatic latent image bearing member;
an electrostatic latent image forming unit configured to form an electrostatic latent image on the electrostatic latent image bearing member;
a developing unit comprising a toner and configured to develop the electrostatic latent image formed on the electrostatic latent image bearing member to form a visible image,
wherein the toner comprises a polyester resin,
wherein the polyester resin comprises a diol component and a crosslink component as constituent components thereof,
wherein the diol component comprises an aliphatic diol having 3 to 10 carbon atoms in an amount of 50 mol % or more,
wherein the crosslink component comprises a trihydric or higher aliphatic alcohol, and
wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C., where the glass transition temperature (Tg1st) is measured in first heating in differential scanning calorimetry (DSC) of the toner.

Assignees

• Chiba Susumu
• Sugimoto Tsuyoshi
• Nakayama Shinya
• Nagata kohsuke
• Nagai Shinsuke
• Asahina Daisuke
• Ricoh Co Ltd

Inventors

• Chiba Susumu
• Sugimoto Tsuyoshi
• Nakayama Shinya
• Nagata kohsuke
• Nagai Shinsuke
• Asahina Daisuke

Classifications

• G03G9/08755 Primary

  Polyesters · CPC title

• G03G9/08795

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

• G03G9/08793

  Crosslinked polymers · CPC title

• G03G9/08797

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

• G03G9/087

  Binders for toner particles · CPC title