Toner

Patent metadata

Field	Value
Publication number	US-2017227864-A1
Application number	US-201715420651-A
Country	US
Kind code	A1
Filing date	Jan 31, 2017
Priority date	Feb 4, 2016
Publication date	Aug 10, 2017
Grant date	—

Abstract

A toner comprising: a toner particle containing a toner base particle containing a binder resin and a colorant, and a resin particle fixed to a surface of the toner base particle; and an inorganic fine particle A, wherein the surface of the toner particle has protruded portions originating in the resin particle, an average length (D) of long sides of the protruded portions is 50 nm to 300 nm, an average Height (H) of the protruded portions is 25 nm to 250 nm, the average long-side length and the average height of the protruded portions satisfies a specific relationship, and an average value of a compactness of the inorganic fine particle A is 0.40 to 0.80, and the attachment rate of the inorganic fine particles A is 0.1% to 5.0% by area.

First claim

What is claimed is:

1 . A toner comprising:
a toner particle containing a toner base particle containing a binder resin and a colorant, and a resin particle fixed to a surface of the toner base particle; and an inorganic fine particle A, wherein the surface of the toner particle has protruded portions originating in the resin particle, an average length (D) of long sides of the protruded portions is from 50 nm to 300 nm, an average height (H) of the protruded portions is from 25 nm to 250 nm, a relationship between the average long-side length and the average height of the protruded portions satisfies the following formula (1), and an average value of a compactness of the inorganic fine particle A observed under scanning electron microscope (SEM) as represented by formula (2) below is from 0.40 to 0.80, and the attachment rate of the inorganic fine particles A with a compactness of from 0.40 to 0.80 is from 0.1% to 5.0% by area according to polycarbonate thin film attachment measurement of the toner:
0.50 D≦H ≦0.80 D   Formula (1)

Compactness=area of inorganic fine particle/area of region enclosed by envelope of inorganic fine particle   Formula (2).

2 . The toner according to claim 1 , wherein a median diameter (D50) of the resin particles as determined by a laser scattering particle size distribution analysis is from 50 nm to 300 nm.

3 . The toner according to claim 1 , wherein an average minimum Feret diameter of the inorganic fine particles A as observed by scanning electron microscopy (SEM) is from 50 nm to 500 nm.

4 . The toner according to claim 1 , wherein in four regions defined as follows in a backscattered electron image of a toner particle taken with a scanning electron microscope,
an average abundance of the resin particles in each region is from 5% to 40% by area, and a coefficient of variation of the number of resin particles as represented by Formula (3) below is 1.5 or less: Definition of regions: In a backscattered electron image of a toner particle, a chord giving the maximum length is given as line segment A, and two straight lines parallel to and 1.5 μm distant from the line segment A are given as line B and line C. A straight line passing through the center point of line segment A at a right angle is given as line D, and two straight lines parallel to and 1.5 μm distant from line D are given as line E and line F. Four square areas each having 1.5 μm sides formed by the line segment A and the lines B, C, D, E and F are defined as the four regions;
Coefficient of variation=(standard deviation of number of particles/average number of particles)   Formula (3).

5 . The toner according to claim 1 , wherein the resin particles contain a resin having ionic functional groups and a pKa (acid dissociation constant) of from 6.0 to 9.0.

Assignees

• Canon Kk

Inventors

• Hotta Yojiro
• Terauchi Kazuo
• Tominaga Tsuneyoshi
• Masumoto Akane
• Mizuguchi Takuya
• Shiozawa Motohide
• Naka Takeshi
• Fujimoto Masami
• Ito Shingo
• Yamamoto Kousuke
• Ikami Yasukazu

Classifications

• G03G9/08755

  Polyesters · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G9/0825 Primary

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

• G03G9/0827

  characterised by their shape, e.g. degree of sphericity · CPC title

• G03G9/09708

  Inorganic compounds · CPC title