Toner

Patent metadata

Field	Value
Publication number	US-9256148-B2
Application number	US-201113988736-A
Country	US
Kind code	B2
Filing date	Nov 24, 2011
Priority date	Nov 29, 2010
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A toner having toner particles, each of which contains a binder resin, a wax and inorganic fine particles, wherein the inorganic fine particles are fixed at the surface of the toner particles as a result of a surface treatment by hot air, and the degree of uneven distribution of wax in the toner is controlled in a depth direction of the toner, from the toner surface towards a toner central portion.

First claim

The invention claimed is:

1. A toner comprising toner particles, each of which contains a binder resin, a wax, a colorant and inorganic fine particles,
wherein
the binder resin is a polyester resin,
the wax is a hydrocarbon wax,
the inorganic fine particles are fixed at the surface of the toner particles as a result of a surface treatment by hot air, and
the toner satisfies the following formula (1):
1.20≦ P 1/ P 2≦2.00  (1)

in the formula (1), P1=Pa/Pb and P2=Pc/Pd, wherein,
Pa is an intensity of the highest absorption peak in a range from 2843 cm −1 to 2853 cm −1 , and
Pb is an intensity of the highest absorption peak in a range from 1713 cm −1 to 1723 cm −1 in an FT-IR spectrum obtained by an attenuated total reflectance (ATR) method by using Ge as the ATR crystal and under the condition of an infrared light-incidence angle of 45°,
and wherein
Pc is an intensity of the highest absorption peak in a range from 2843 cm −1 to 2853 cm −1 , and
Pd is an intensity of the highest absorption peak in a range from 1713 cm −1 to 1723 cm −1 in an FT-IR spectrum obtained by an attenuated total reflectance (ATR) method by using KRS5 as the ATR crystal and under the condition of an infrared light-incidence angle of 45°.

2. The toner according to claim 1 , wherein the wax exhibits a peak temperature of the highest endothermic peak of from 50° C. to 110° C., in an endothermic curve upon rise of temperature as measured by a differential scanning calorimeter (DSC) in a temperature range from 30° C. to 200° C.

3. The toner according to claim 1 , wherein the proportion of particles in the toner having a circle-equivalent diameter ranging from 0.50 μm to less than 1.98 μm with respect to the total of particles having a circle-equivalent diameter ranging from 0.50 μm to less than 39.69 μm is no greater than 15.0 number %, as measured by a flow-type particle image measuring device at an image processing resolution of 512×512 pixels (0.37 μm×0.37 μm per pixel).

4. The toner according to claim 1 , wherein a specific surface area of the inorganic fine particles ranges from 10 m 2 /g to 60 m 2 /g.

5. The toner according to claim 1 , wherein the P1/P2 ranges from 1.30 to 1.80.

Assignees

• Fujikawa Hiroyuki
• Nakamura Kunihiko
• Komatsu Nozomu
• Fukudome Kosuke
• Shiotari Yoshiaki
• Itakura Takayuki
• Canon Kk

Inventors

• Fujikawa Hiroyuki
• Nakamura Kunihiko
• Komatsu Nozomu
• Fukudome Kosuke
• Shiotari Yoshiaki
• Itakura Takayuki

Classifications

• G03G9/08755 Primary

  Polyesters · CPC title

• G03G9/09708

  Inorganic compounds · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G9/087 Primary

  Binders for toner particles · CPC title

• G03G9/08797

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