Toner

• US 9,651,883 B2
• Filed: 06/10/2016
• Issued: 05/16/2017
• 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, Kanno, Ichiro, Hashimoto, Takeshi, Komatsu, Nozomu, Fujikawa, Hiroyuki, Kobori, Takakuni
• Primary Examiner(s): VAJDA, PETER L
• Application Number:
  US15/179,489
• Publication Number:
  US 20160363878A1
• Time in Patent Office: 340 Days
• CPC Class Codes: G03G 9/0819 characterised by the dimensions of the particles
• 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 9/08782 Waxes
• 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 an amorphous polyester resin, a crystalline polyester resin and a wax, wherein in a cross-section of the toner by transmission electron microscopy (TEM), domains of the wax and crystals of the crystalline polyester resin are present, the area occupied by the domains of the wax is 0.5% to 8.0% and the area occupied by the crystals of the crystalline polyester resin is 0.5% to 8.0% of the cross-sectional area of the toner, the number-average diameter Dw of the domains of the wax is 60 nm to 240 nm, the aspect ratio of the crystals of the crystalline polyester resin is 5.0 to 25.0, and the number-average diameter Dc of major axis lengths of the crystals of the crystalline polyester resin is 0.8 to 2.0 times the Dw.

Claims

1. A toner comprising a toner particle containing an amorphous polyester resin, a crystalline polyester resin and a wax, wherein

in a cross-section of the toner by transmission electron microscopy (TEM),

domains of the wax and crystals of the crystalline polyester resin are present,

the area occupied by the domains of the wax is from 0.5% to 8.0% and the area occupied by the crystals of the crystalline polyester resin is from 0.5% to 8.0% of the cross-sectional area of the toner,

the number-average diameter (Dw) of the domains of the wax is from 60 nm to 240 nm,

the aspect ratio of the crystals of the crystalline polyester resin is from 5.0 to 25.0, and

the number-average diameter (Dc) of major axis lengths of the crystals of the crystalline polyester resin is from 0.8 to 2.0 times the number-average diameter (Dw) of the domains of the wax.

2. The toner according to claim 1, wherein the number-average diameter Dc is 280 nm or less.

3. The toner according to claim 1, wherein the standard deviation of the number-average diameter Dw is 100 nm or less, and the standard deviation of the number-average diameter Dc is 100 nm or less.

4. The toner according to claim 1, wherein the toner particle contains an inorganic fine particle as an internal additive.

5. The toner according to claim 1, which has been heat-treated at a temperature at least 40°

C. higher than the melting point of the wax.