Toner

Patent metadata

Field	Value
Publication number	US-2017160661-A1
Application number	US-201615259293-A
Country	US
Kind code	A1
Filing date	Sep 8, 2016
Priority date	Dec 4, 2015
Publication date	Jun 8, 2017
Grant date	—

Abstract

Provided is a toner including a binder resin, a colorant, a crystalline polyester, and a release agent, wherein a cross-sectional image of the toner is observed using a scanning transmission electron microscope, domains of the crystalline polyester are present in the cross-sectional image of the toner, the domains have a number-average major diameter of at least 50 nm and not more than 300 nm, the number of the domains is at least 8 and not more than 500, and the domains are present at at least 60 number % and not more than 100 number % from an outline of the cross-sectional image to 25% of the distance between the outline and the centroid of the cross-sectional image.

First claim

What is claimed is:

1 . A toner comprising a toner particle containing a binder resin, a colorant, a crystalline polyester, and a release agent, wherein
when a cross-sectional image of the toner is observed using a scanning transmission electron microscope, domains of the crystalline polyester are present in the cross-sectional image of the toner, the domains have a number-average major diameter of at least 50 nm and not more than 300 nm, the number of the domains is at least 8 and not more than 500, and a ratio of the domains present in an area from an outline of the cross-sectional image to 25% of a distance between the outline and a centroid of the cross-sectional image, to a total number of the domains present in the cross-sectional image of the toner is at least 60 number % and not more than 100 number %.

2 . The toner according to claim 1 , wherein
domains of the release agent are present in the cross-sectional image, and a ratio of a total area of the domains of the release agent to an area of the cross-sectional image of the toner is at least 5.0 area % and not more than 30.0 area %.

3 . The toner according to claim 1 , wherein
domains of the release agent are present in the cross-sectional image of the toner, and a ratio of the toner at which the domains of the release agent are present in the centroid of the cross-sectional image is at least 80 number % of the toner.

4 . The toner according to claim 1 , wherein the colorant includes a magnetic body.

5 . The toner according to claim 4 , wherein a thermal conductivity of the toner is at least 0.210 W/(m·K) and not more than 1.000 W/(m·K).

6 . The toner according to claim 1 , wherein the binder resin includes a styrene-acrylic resin.

7 . The toner according to claim 1 , wherein the release agent includes an ester compound of a dihydric alcohol and an aliphatic monocarboxylic acid, or an ester compound of a divalent carboxylic acid and an aliphatic monoalcohol.

8 . The toner according to claim 1 , wherein an acid value of the crystalline polyester is at least 0.5 mg KOH/g and not more than 5.0 mg KOH/g.

9 . The toner according to claim 1 , wherein the release agent further includes an aliphatic hydrocarbon wax.

Assignees

• Canon Kk

Inventors

• Suzumura Yoshitaka
• Hasegawa Yusuke
• Sano Tomohisa
• Ohmori Atsuhiko
• Uratani Kozue
• Nagashima Yuujirou

Classifications

• G03G9/0926

  characterised by physical or chemical properties · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/0821 Primary

  characterised by physical parameters (magnetic parameters G03G9/083) · CPC title

• G03G9/08795

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

• G03G9/08782

  Waxes · CPC title