Toner

Patent metadata

Field	Value
Publication number	US-10012923-B2
Application number	US-201715490174-A
Country	US
Kind code	B2
Filing date	Apr 18, 2017
Priority date	Apr 21, 2016
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

Provided is a toner including toner particles, each of which contains a binder resin, a colorant, a releasing agent and a crystalline polyester, wherein in an observation of a cross-section each of the toner particles by transmission electron microscopy, specific toner particles each of which has domains of the crystalline polyester and domains of the releasing agent, are present at a ratio of at least 70% by number of the toner particles in the toner, an arithmetic mean of maximum diameters of the domains of the releasing agent is within prescribed range, and the specific toner particles satisfy prescribed conditions.

First claim

What is claimed is:

1. A toner comprising toner particles, each of which contains a binder resin, a colorant, a releasing agent and a crystalline polyester, wherein
in an observation of a cross-section of each of the toner particles by transmission electron microscopy,
specific toner particles, each of which has domains of the crystalline polyester and domains of the releasing agent, are present at a ratio of at least 70% by number of the toner particles in the toner,
an arithmetic mean of maximum diameters of the domains of the releasing agent is at least 1.0 μm and not more than 4.0 μm, and
the specific toner particles satisfy conditions (i) to (iii):
(i) an average coverage ratio of the domains of the releasing agent by the domains of the crystalline polyester is at least 80%;
(ii) an average ratio of an area occupied by the domains of the crystalline polyester to a cross-sectional area of each of the specific toner particles is at least 10.0% and not more than 40.0%; and
(iii) an average ratio of an area occupied by the domains of the releasing agent to a cross-sectional area of each of the specific toner particles is at least 10.0% and not more than 40.0%.

2. The toner according to claim 1 , wherein the binder resin is made primarily of a styrene acrylic resin.

3. The toner according to claim 1 , wherein in the cross-section of each of the toner particles observed by transmission electron microscopy, a total number of the domains of the releasing agent and domains of the crystalline polyester having a maximum diameter of at least 5 nm and not more than 500 nm is at least 50 and not more than 500 per individual toner particle cross-section.

4. The toner according to claim 1 , wherein the crystalline polyester has a terminal structure derived from an acid monomer selected from the group consisting of lauric acid, stearic acid and behenic acid.

Assignees

• Canon Kk

Inventors

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

Classifications

• G03G9/0825

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

• G03G9/09733 Primary

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

• G03G9/0902

  Inorganic compounds · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/0819 Primary

  characterised by the dimensions of the particles · CPC title