Toner

Patent metadata

Field	Value
Publication number	US-9946179-B2
Application number	US-201615362992-A
Country	US
Kind code	B2
Filing date	Nov 29, 2016
Priority date	Dec 4, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A toner comprising a binder resin, a crystalline material, and a colorant, wherein, in a cross section image of the toner, when R (μm) is a long axis of the toner, r (μm) is a long axis of a crystalline material domain, domain A is a domain satisfying formula (ii), and domain B is a domain satisfying formula (iii), the toner in which the domain A and the domain B are both present is at least 50 number %; an number average diameter R Avg of the long axis of the toner satisfies formula (i); and a number of domain B per toner cross section of one toner is 20 to 300.

4 μm≤ R Avg ≤12 μm  (i)

0.125≤ r/R ≤0.375  (ii)

0.000625≤ r/R ≤0.0625  (iii)

First claim

What is claimed is:

1. A toner comprising a binder resin, a crystalline material and a colorant, said toner providing a domain of the crystalline material in a cross section of the toner observed with a scanning electron microscope, wherein
when domain A satisfies 0.125≤r/R≤0.375 and domain B satisfies 0.000625≤r/R≤0.0625, where r represents a long axis of the domain of the crystalline material and R represents the long axis of the toner,
the toner in which the domain A and the domain B are both present is at least 50 number %,
the toner satisfies 4 μm≤R Avg ≤12 μm where R Avg represents the number average diameter of a long axis of the toner, and
the number of domain B per cross section image of one toner is 50 to not more than 300.

2. The toner according to claim 1 , wherein the crystalline material comprises an ester wax.

3. The toner according to claim 1 , wherein an aspect ratio of domain B is from 0.8 to 1.0.

4. The toner according to claim 2 , wherein the ester wax comprises an ester compound, and
the proportion of the highest-content ester compound relative to a total amount of the ester wax is 40 to 80 mass % in a composition distribution of the ester wax measured by GC-MASS or MALDI TOF MASS.

5. The toner according to claim 2 , wherein the ester wax is any of an ester compound from an at least dihydric alcohol and an aliphatic monocarboxylic acid and an ester compound from an at least dibasic carboxylic acid and an aliphatic monoalcohol.

Assignees

• Canon Kk

Inventors

• Arimura Satoshi
• Hasegawa Yusuke
• Sano Tomohisa
• Suzumura Yoshitaka
• Ikejiri Takuma

Classifications

• G03G9/0926

  characterised by physical or chemical properties · CPC title

• G03G9/0825 Primary

  characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093) · CPC title

• G03G9/0902

  Inorganic compounds · CPC title

• G03G9/08755 Primary

  Polyesters · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title