TONER AND TWO-COMPONENT DEVELOPER

• US 20090233212A1
• Filed: 05/27/2009
• Published: 09/17/2009
• Est. Priority Date: 12/27/2007
• Status: Abandoned Application

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Shiotari, Yoshiaki, Nakamura, Kunihiko, Itakura, Takayuki, Fujikawa, Hiroyuki, Komatsu, Nozomu, Ohtsu, Takeshi
• Application Number:
  US12/472,944
• Publication Number:
  US 20090233212A1
• Time in Patent Office: Days
• US Class Current: 430/109.400
• CPC Class Codes: G03G 9/0815 Post-treatment
• CPC Class Codes: G03G 9/0821 characterised by physical parameters magnetic parameters G03G9/083
• CPC Class Codes: G03G 9/0825 characterised by their structure; characterised by non-homogenuous distribution of components microcapsular toners G03G9/093
• CPC Class Codes: G03G 9/0827 characterised by their shape, e.g. degree of sphericity
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08782 Waxes
• CPC Class Codes: G03G 9/107 having magnetic components

Abstract

Provided is a toner including: toner particles each containing at least a binder resin and a wax; and an external additive, in which surfaces of the toner particles have an average surface roughness (Ra) measured with a scanning probe microscope of 1.0 nm or more and 30.0 nm or less; and the toner has a surface tension index I for a 45-vol % aqueous solution of methanol measured by a capillary suction time method and calculated from the following equation (1) of 5.0×10⁻³ N/m or more and 1.0×10⁻¹ N/m or less:

I=P_α/(A×B×10⁶)  Eq. (1)

where I represents the surface tension index (N/m) of the toner, P_α represents a capillary pressure (N/m²) of the toner for the 45-vol % aqueous solution of methanol, A represents a specific surface area (m²/g) of the toner, and B represents a true density (g/cm³) of the toner.

Claims

1. A toner, comprising:

toner particles each containing at least a binder resin and a wax; and

an external additive, wherein;

surfaces of the toner particles have an average surface roughness (Ra) measured with a scanning probe microscope of 1.0 nm or more and 30.0 nm or less; and

the toner has a surface tension index I for a 45-vol % aqueous solution of methanol measured by a capillary suction time method and calculated from the following equation (1) of 5.0×

10<sup>−

3</sup> N/m or more and 1.0×

10<sup>−

1</sup> N/m or less;

I=P_α

/(A×

B×

10⁶) 

 

Eq. (1)

where I represents the surface tension index (N/m) of the toner, P_α

represents a capillary pressure (N/m²) of the toner for the 45-vol % aqueous solution of methanol, A represents a specific surface area (m²/g) of the toner, and B represents a true density (g/cm³) of the toner.

2. A toner according to claim 1, wherein the toner has an average circularity of 0.950 or more and 1.000 or less in a circularity distribution for particles of the toner each having a circle-equivalent diameter of 2.00 μ

m or more and 200.00 μ

m or less, which is measured with a flow-type particle image measuring apparatus having an image processing resolution of 512×

512 pixels corresponding to 0.37 μ

m×

0.37 μ

m per pixel.

3. A toner according to claim 1, wherein the surfaces of the toner particles have a ten point height of roughness (Rz) measured with a scanning probe microscope of 10 nm or more and 1,000 nm or less.

4. A toner according to claim 1, wherein the binder resin contains a resin having a polyester unit.

5. A toner according to claim 1, wherein an abundance of the wax on a surface of the toner is 60% or more and 100% or less.

6. A toner according to claim 1, wherein the toner particles each contain a polymer having a structure obtained by a reaction between a vinyl-based resin component and a hydrocarbon compound.

7. A toner according to claim 1, wherein the toner particles are obtained by performing a surface treatment with hot air.

8. A toner according to claim 1, wherein the toner particles each contain a colorant.

9. A two-component developer, comprising:

a magnetic carrier; and

toner

wherein the toner comprises the toner according to claim 1.

10. A two-component developer according to claim 9, wherein the magnetic carrier has a contact angle relative to water of 80°

or more and 125°

or less.