Toner

• US 10,082,743 B2
• Filed: 06/08/2016
• Issued: 09/25/2018
• Est. Priority Date: 06/15/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hama, Masayuki, Kaneko, Hideki, Hashimoto, Takeshi, Kanno, Ichiro, Komatsu, Nozomu, Kobori, Takakuni, Fujikawa, Hiroyuki
• Primary Examiner(s): Chea, Thorl
• Application Number:
  US15/176,541
• Publication Number:
  US 20160363877A1
• Time in Patent Office: 839 Days
• 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 9/08755 Polyesters
• CPC Class Codes: G03G 9/08795 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
• CPC Class Codes: G03G 9/08797 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature

Abstract

A toner comprising a toner particle containing a crystalline polyester resin and an amorphous polyester resin, wherein, in a cross-sectional observation of the toner by transmission electron microscopy (TEM), the number-average diameter (D1) of major axis lengths of the crystalline polyester resin dispersed up to a depth of 0.30 μm from a toner surface is 40 nm to 110 nm, and the number-average diameter (D1) of major axis lengths of the crystalline polyester resin dispersed deeper than 0.30 μm from the toner surface is 1.25 to 4.00 times the number-average diameter (D1) of the major axis lengths of the crystalline polyester resin dispersed up to a depth of 0.30 μm from the toner surface.

Claims

1. A toner comprising a toner particle containing a crystalline polyester resin and an amorphous polyester resin, the crystalline polyester resin being dispersed as crystal domains in the amorphous polyester resin, wherein in a cross-sectional observation of the toner by transmission electron microscopy (TEM),

a first number-average diameter (D1) of major axis lengths of the crystal domain dispersed up to a depth of 0.30 μ

m from a toner surface is from 40 nm to 110 nm, and

a second number-average diameter (D1) of major axis lengths of the crystal domains dispersed deeper than 0.30 μ

m from the toner surface is from 60 nm to 300 nm, the second number-average diameter (D1) further being from 1.25 to 4.00 times the first number-average diameter (D1).

2. The toner according to claim 1, wherein the aspect ratio of the crystalline polyester resin dispersed deeper than 0.30 μ

m from the toner surface is from 6.0 to 30.0.

3. The toner according to claim 1, which has a maximum value of from 80 nm to 200 nm in the number distribution of the major axis lengths of the crystalline polyester resin dispersed deeper than 0.30 μ

m from the toner surface, and

has a maximum value of from 50 to 100 nm in the number distribution of the major axis lengths of the crystalline polyester resin dispersed up to a depth of 0.30 μ

m from the toner surface.