Toner, two-component developer, and color-image forming apparatus

Patent metadata

Field	Value
Publication number	US-9874826-B2
Application number	US-201514925179-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Nov 21, 2014
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A toner, including a binder resin, a release agent, and a colorant, wherein a total amount of hydrocarbon compounds having 33 to 35 carbon atoms in the toner measured by ion attachment mass spectrometry (IAMS) is 40% to 70% in terms of a signal intensity ratio.

First claim

What is claimed is:

1. A toner comprising:
a binder resin;
a release agent, which is a paraffin wax comprising a hydrocarbon compound having 33 to 35 carbon atoms; and
a colorant,
wherein a total amount of hydrocarbon compounds having 33 to 35 carbon atoms in the toner measured by ion attachment mass spectrometry (IAMS) is 40% to 70% in terms of a signal intensity ratio, and a total amount of hydrocarbon compounds having 33 to 35 carbon atoms in the release agent is 40% to 70% in terms of a signal intensity ratio.

2. The toner according to claim 1 , wherein an amount of the toner reduced when the toner is heated at 165° C. for 10 minutes is 0.01% by mass to 0.40% by mass, and an amount of the toner reduced when the toner is heated to 2500° C. after heated at 165° C. for 10 minutes is 0.1% by mass to 5.0% by mass.

3. The toner according to claim 1 , further comprising ethyl acetate as a volatile organic compound in an amount of 1 μg/g to 30 μg/g.

4. The toner according to claim 1 , wherein the toner has a core-shell structure.

5. The toner according to claim 1 , wherein the toner contains a polyester resin.

6. The toner according to claim 1 , wherein the toner contains a modified polyester resin.

7. The toner according to claim 1 , wherein an average circularity of the toner is 0.93 to 0.99.

8. The toner according to claim 1 , wherein a weight average particle diameter D 4 of the toner is 2 μm to 7 μm, and a ratio (D 4 /D n ) of the weight average particle diameter (D 4 ) to a number average particle diameter (D n ) of the toner is 1.00 to 1.25.

9. A two-component developer comprising:
a toner; and
a carrier having magnetism,
wherein the toner comprises:
a binder resin, which is a paraffin wax comprising a hydrocarbon compound having 33 to 35 carbon atoms;
a release agent; and
a colorant,

wherein a total amount of hydrocarbon compounds having 33 to 35 carbon atoms in the toner measured by ion attachment mass spectrometry (IAMS) is 40% to 70% in terms of a signal intensity ratio, and a total amount of hydrocarbon compounds having 33 to 35 carbon atoms in the release agent is 40% to 70% in terms of a signal intensity ratio.

10. A color-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 toner and configured to develop the electrostatic latent image with the toner 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 by a fixing member,
wherein the color-image forming apparatus is a tandem developing system including at least four or more developing units having different developing colors disposed in series and a contact pressure by the fixing member is 10 N/cm 2 to 150 N/cm 2 , and
wherein the toner is the toner according to claim 1 .

11. A process cartridge comprising:
an electrostatic latent image bearer; and
a developing unit containing a toner and configured to develop an electrostatic latent image formed on the electrostatic latent image bearer with the toner to form a visible image,
wherein the process cartridge is detachable to a main body of an image forming apparatus, and
wherein the toner is the toner according to claim 1 .

12. A color-image forming method comprising:
forming an electrostatic latent image on an electrostatic latent image bearer;
developing the electrostatic latent image with a toner to form a visible image;
transferring the visible image onto a recording medium to form a transferred image on the recording medium; and

fixing the transferred image on the recording medium by a fixing member,
wherein the color-image forming method is performed by a tandem developing system including at least four or more developing units having different developing colors disposed in series and a contact pressure by the fixing member of the color-image forming apparatus is 10 N/cm 2 to 150 N/cm 2 , and
wherein the toner is the toner according to claim 1 .

Assignees

• Sugiura Hideki
• Kumai Mio
• Ricoh Co Ltd

Inventors

• Sugiura Hideki
• Kumai Mio

Classifications

• G03G9/08782 Primary

  Waxes · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G2215/0129

  horizontal medium transport path at the secondary transfer · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/09733

  Organic compounds (G03G9/08782 takes precedence) · CPC title